Phase I Trial of the PARP Inhibitor Olaparib and AKT Inhibitor Capivasertib in Patients with BRCA1/2- and Non–BRCA1/2-Mutant Cancers

Published OnlineFirst June 12, 2020; DOI: 10.1158/2159-8290.CD-20-0163

Research Article

Timothy A. Yap1,2, Rebecca Kristeleit3, Vasiliki Michalarea1, Stephen J. Pettitt4,5, Joline S.J. Lim1, Suzanne Carreira2, Desamparados Roda1,2, Rowan Miller3, Ruth Riisnaes2, Susana Miranda2, Ines Figueiredo2, Daniel Nava Rodrigues2, Sarah Ward1,2, Ruth Matthews1,2, Mona Parmar1,2, Alison Turner1,2, Nina Tunariu1, Neha Chopra1,4, Heidrun Gevensleben2, Nicholas C. Turner1,4, Ruth Ruddle2, Florence I. Raynaud2, Shaun Decordova2, Karen E. Swales2, Laura Finneran2, Emma Hall2, Paul Rugman6, Justin P.O. Lindemann6, Andrew Foxley6, Christopher J. Lord4,5, Udai Banerji1,2, Ruth Plummer7, Bristi Basu8, Juanita S. Lopez1,2, Yvette Drew7, and Johann S. de Bono1,2

abstract Preclinical studies have demonstrated synergy between PARP and PI3K/AKT pathway inhibitors in BRCA1 and BRCA2 (BRCA1/2)–deficient andBRCA1/2 -proficient tumors. We conducted an investigator-initiated phase I trial utilizing a prospective intrapatient dose- escalation design to assess two schedules of capivasertib (AKT inhibitor) with olaparib (PARP inhibitor) in 64 patients with advanced solid tumors. Dose expansions enrolled germline BRCA1/2-mutant tumors, or BRCA1/2 wild-type cancers harboring somatic DNA damage response (DDR) or PI3K–AKT pathway alterations. The combination was well tolerated. Recommended phase II doses for the two schedules were: olaparib 300 mg twice a day with either capivasertib 400 mg twice a day 4 days on, 3 days off, or capivasertib 640 mg twice a day 2 days on, 5 days off. Pharmacokinetics were dose proportional. Pharmacodynamic studies confirmed phosphorylated (p) GSK3β suppression, increased pERK, and decreased BRCA1 expression. Twenty-five (44.6%) of 56 evaluable patients achieved clinical benefit (RECIST complete response/partial response or stable disease ≥ 4 months), including patients with tumors harboring germline BRCA1/2 mutations and BRCA1/2 wild-type cancers with or without DDR and PI3K–AKT pathway alterations.

SIGNIFICANCE: In the first trial to combine PARP and AKT inhibitors, a prospective intrapatient dose- escalation design demonstrated safety, tolerability, and pharmacokinetic–pharmacodynamic activity and assessed predictive biomarkers of response/resistance. Antitumor activity was observed in patients harboring tumors with germline BRCA1/2 mutations and BRCA1/2 wild-type cancers with or without somatic DDR and/or PI3K–AKT pathway alterations.

INTRODUCTION BRCA1/2-mutated advanced ovarian cancer and in patients with germline BRCA1/2-mutated pancreatic cancer (4, 5). PARP inhibitors are the first clinically approved drugs Olaparib is also FDA-approved for the treatment of patients designed to exploit synthetic lethality in homologous recom with germline BRCA1/2-mutant, HER2-negative metastatic bination (HR)–deficient cells,demonstrating proof-of-con breast cancers (6, 7). In addition, there are now early clinical cept activity in BRCA1/2-mutant cancers (1, 2). The PARP trial data from patients with tumors harboring other DNA inhibitor olaparib (Lynparza; AstraZeneca) was the first in repair aberrations (8). class to be approved by the FDA in the advanced recurrent Despite these broader indications, the greatest clinical ben ovarian cancer setting for women with BRCA1/2-mutant can efit from PARP inhibitor monotherapy has been observed in cers (3). Olaparib has subsequently received FDA approval the high-grade serous germline BRCA1/2-mutant ovarian can in the maintenance setting for recurrent platinum-sensitive cer population (3). However, these patients almost inevitably ovarian cancers regardless of BRCA1/2 status and, most develop PARP inhibitor resistance and disease progression. recently, in the first-line maintenance setting post–platinum- The utility of PARP inhibitor monotherapy in patients with based chemotherapy both in women with germline or somatic different cancers harboring other DNA-repair aberrations is also limited by the emergence of drug resistance and generally short-lived antitumor responses (9). Even for patients with 1 2 Royal Marsden Hospital, London, United Kingdom. The Institute of Cancer advanced solid tumors bearing deleterious BRCA1/2 muta Research, London, United Kingdom. 3University College London, London, United Kingdom. 4The Breast Cancer Now Toby Robins Research Centre, The tions, response rates are between 30% and 60% depending Institute of Cancer Research, London, United Kingdom. 5The CRUK Gene on tumor type (3). There is therefore a major unmet need for Function Laboratory, The Institute of Cancer Research, London, United novel antitumor strategies to increase both the proportion of 6 Kingdom. Oncology R&D, AstraZeneca, Cambridge, United Kingdom. patients with clinical benefit as well as the depth and dura 7Clinical and Translational Research Institute, Newcastle University, New- castle, United Kingdom. 8Department of Oncology, University of Cambridge, tion of response for patients treated with PARP inhibitors Cambridge, United Kingdom. (10). Such approaches include the development of rational Note: Supplementary data for this article are available at Cancer Discovery combination strategies. Multiple preclinical studies have Online (http://cancerdiscovery.aacrjournals.org/). demonstrated synergistic antitumor activity with the com Current address for T.A. Yap: The University of Texas MD Anderson Cancer bination of PARP and PI3K–AKT pathway inhibitors in both Center, Houston, Texas. BRCA-deficient and BRCA-proficient cancer models (11–14). Corresponding Author: Timothy A. Yap, The University of Texas MD Ander- PI3K pathway inhibition has been shown to lead to suppres son Cancer Center, 1400 Holcombe Boulevard, Houston, TX 77030. Phone: sion of BRCA gene transcription, which was accompanied by 713-839-5458; E-mail: [email protected] ERK phosphorylation. Overexpression of an active form of Cancer Discov 2020;10:1–16 MEK1 was found to result in ERK activation and downregu doi: 10.1158/2159-8290.CD-20-0163 lation of BRCA1, resulting in HR deficiency and subsequent ©2020 American Association for Cancer Research. PARP inhibitor sensitivity, thus providing strong rationale

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RESEARCH ARTICLE Yap et al. for the development of this combination as an antitumor Safety strategy (11). A phase Ib trial of olaparib in combination with During the dose-escalation phase of the 4-days-on, 3-days- the PI3Kα-specific inhibitor alpelisib demonstrated RECIST off (4/3) schedule, doses of capivasertib were increased using partial responses (PR) in 10 (36%) of 28 patients with ovarian the prospective intrapatient dose-escalation design from 320 cancer, providing early clinical proof of concept (15). and 400 mg to 480 mg twice a day with a fixed dose of olapa Several novel molecularly targeted agents against the rib at 300 mg twice a day (Supplementary Fig. S1). Of 10 PI3K–AKT pathway have now been developed, including the patients treated in this 4/3 schedule, only one dose-limiting AKT inhibitor capivasertib (AZD5363; AstraZeneca; ref. 16). toxicity (DLT) of grade 3 maculopapular rash, typical of that Capivasertib is a potent and selective ATP competitive inhibi observed with capivasertib and other AKT inhibitors, was tor of all three isoforms of AKT, which is safe and well-toler observed at the highest dose assessed of capivasertib, 480 mg ated in patients with advanced solid tumors, but with limited twice a day, with olaparib 300 mg twice a day (Table 2). The antitumor benefit as a single agent in early-phase clinical erythematous rash fully resolved after both capivasertib and trials (17–19). This is hypothesized to be due to multiple fac olaparib were withheld, and no recurrent rash was observed tors, including the development of signaling cross-talk and after both drugs were restarted at a reduced dose of capiva disruption of feedback loops, leading to acquired resistance, sertib 400 mg twice a day with olaparib maintained at 300 mg supporting the use of combination strategies in molecularly twice a day. At the dose level of capivasertib 480 mg twice a day defined patients for the optimal development of AKT inhibi with olaparib 300 mg twice a day administered in a 4/3 sched tors, such as with PARP inhibitors as described above (20, 21). ule, other non-DLT grade 3 toxicities were observed, includ On the basis of these promising data, we conducted an ing anemia (n = 1), vomiting (n = 1), and diarrhea (n = 2). investigator-initiated phase Ib clinical trial to determine the Because of the DLT of grade 3 rash, non-DLT grade 3 adverse safety, tolerability, MTD, recommended phase II dose (RP2D), events, and chronic low-grade adverse events, for example, pharmacokinetics, pharmacodynamics, and preliminary anti fatigue and anemia, observed outside the DLT period of tumor activity of olaparib in combination with capivasertib 21 days at the dose of capivasertib 480 mg twice a day with in patients with advanced solid tumors. We also assessed olaparib 300 mg twice a day, the Safety Review Committee a prospective intrapatient dose-escalation strategy where (SRC) established the dose level of olaparib 300 mg twice a patients were permitted to prospectively increase doses of day with capivasertib 400 mg twice a day as the RP2D for the capivasertib after each cycle (if no grade 2 or worse toxicities 4/3 schedule. were observed) in combination with a fixed olaparib dose. For the 2-days-on, 5-days-off (2/5) schedule of capivasertib RP2D expansion cohorts were undertaken in patients with (i) with olaparib 300 mg twice a day, dose escalation proceeded germline BRCA1/2-mutant cancers and (ii) sporadic cancers through dose levels of 480, 560, and 640 mg twice a day with with DNA damage response (DDR) aberrations or molecular olaparib 300 mg twice a day. In the 10 patients treated on the abnormalities along the PI3K–AKT pathway. Detailed analyses 2/5 schedule, no DLTs were observed, and the highest dose of archived and fresh sequential tumor biopsies, as well as tar level of capivasertib at 640 mg twice a day with olaparib 300 geted sequencing of serial cell-free DNA (cfDNA) samples, were mg twice a day was selected as the RP2D. In view of simi conducted to identify determinants of response and resistance, larities in overall safety, tolerability, and DLT rates, the SRC including genomic factors and protein expression, and phar elected to explore both the 4/3 and 2/5 schedules of capiva macodynamic mechanism-of-action biomarker studies. sertib in the dose-expansion phase. The most common all-grade treatment-emergent adverse RESULTS events (TEAE) observed for all patients across both dose Patients schedules were gastrointestinal (GI) toxicities, including nau sea [67% (grade 3–4, 4%)], diarrhea [55% (grade 3–4, 6%)], We enrolled 64 patients with advanced solid tumors from and vomiting [41% (grade 3–4, 5%)], as well as fatigue [51% four major cancer centers in the United Kingdom into the (grade 3–4, 5%); Table 2; Supplementary Tables S1 and S2]. dose-escalation (20 patients) or dose-expansion (44 patients) Other significant grade 3–4 toxicities included grade 3 ane cohorts of this phase I trial. Characteristics of these patients mia (10%) on the 4/3 schedule. Overall, the 4/3 schedule are provided in Table 1. The most common tumor enrolled appeared to be less well tolerated than the 2/5 schedule, as was advanced ovarian cancer (39% of patients); these patients exhibited during dose escalation: six grade 3 TEAEs [anemia had received a median of five prior therapies (range 1–12). and diarrhea (n = 2 each); rash and vomiting (n = 1 each)] were The next most common tumor type was advanced breast observed with the 4/3 schedule, and only three grade 3 TEAEs cancer (28% of patients); these patients had received a median [liver transaminitis, fatigue, and hyperglycemia (all n = 1)] in number of three prior therapies (range 2–10). the 2/5 schedule. No drug-related grade 4–5 toxicities were Prospective Intrapatient Dose Escalation observed in either schedule. The prospective intrapatient dose-escalation strategy uti Pharmacokinetics lized during each dose schedule allowed rapid, seamless, and Dose escalation of capivasertib showed dose-dependent safe dose escalation, resulting in completion of the dose- increases in pharmacokinetic exposures (Fig. 1A and B; Sup escalation phases of two combination schedules over three plementary Tables S3 and S4). The pharmacokinetic profile dose levels in 7 months (Supplementary Fig. S1). Overall, only and overall concentration–time profile of capivasertib and 10 patients were required to assess three different dose levels olaparib were similar to that previously observed in single- for each schedule and to establish both RP2Ds, respectively. agent studies, with no significant interactions identified.

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Table 1. Patient demographics

Olaparib 300 mg BID and capivasertib BID either 4/3 or 2/5 schedule Total

Characteristic 4/3 schedule, n = 33 (52%) 2/5 schedule, n = 31 (48%) N = 64 (100%) Median age, years (range) 59 (32–76) 54 (32–72) 57 (32–76) Gender no. (%) Male 6 (18) 5 (16) 11 (17) Female 27 (82) 26 (84) 53 (83) ECOG PS, no. (%) ECOG PS 0 13 (39) 9 (29) 22 (34) ECOG PS 1 20 (61) 22 (71) 42 (66) Tumor, no. (%) Ovarian 13 (39) 12 (39) 25 (39) (7 germline BRCA1/2; 4 somatic BRCA1/2) (4 germline BRCA1/2; 1 somatic BRCA1/2) Breast 8 (24) 10 (32) 18 (28) (2 germline BRCA1/2) (5 germline BRCA1/2; 1 germline PALB2) Pancreatic 3 (9) 2 (7) 5 (8) CRPC 2 (6) 2 (7) 4 (6) (1 germline BRCA1/2) (2 germline BRCA1/2) Cervical 2 (6) — 2 (3) Endometrial 1 (3) 1 (3) 2 (3) Bladder 1 (3) — 1 (1.5) Colorectal 1 (3) — 1 (1.5) Cholangiocarcinoma — 1 (3) 1 (1.5) GIST — 1 (3) 1 (1.5) Cancer of unknown origin 1 (3) — 1 (1.5) Pleural mesothelioma — 1 (3) 1 (1.5) Peritoneal mesothelioma — 1 (3) 1 (1.5) Carcinosarcoma (uterine) — 1 (3) 1 (1.5) Median prior lines of 3 (1–10) 5 (1–12) 4 (1–12) systemic therapy, no. (range) Ovarian (n = 25) 5 (1–9) 5 (4–12) 5 (1–12) Breast (n = 18) 3 (2–10) 4 (3–9) 3 (2–10)

Abbreviations: BID, twice a day; GIST, gastrointestinal stromal tumors.

Pharmacodynamics Group (GCIG) CA-125 response or Prostate Cancer Clinical Pharmacodynamic studies in platelet-rich plasma (PRP) Trials Working Group 2 (PCWG2) PSA response]. Fourteen (25%) patients achieved RECIST PRs (12 confirmed and 2 showed significant decrease in Ser9 GSK3β phosphorylation post treatment at all doses in the escalation and expansion unconfirmed). In addition, 11 (20%) patients had RECIST phases (Fig. 2A and B), confirming target modulation by stable disease (SD) for at least 4 months (SD ≥ 4 months), capivasertib. Phosphorylated ERK expression levels assessed giving a clinical benefit rate (CBR) of 44.6% (95% confidence with IHC increased in fresh tumor biopsies collected on cycle interval, 31.3–58.5). Of these 56 evaluable patients, 16 (29%) 1 day 15 compared with baseline samples in 6 of 8 patients, patients were treated on study for more than 6 months, while remaining unchanged in 1 patient and decreasing in whereas 7 (13%) patients were treated on trial for more than another patient (Fig. 2C). At the same timepoint, BRCA1 1 year. expression decreased in paired fresh tumor biopsies obtained Molecular Characteristics of Patients with Clinical Benefit from all 8 patients (Fig. 2D). Among the 25 (44.6%) patients who achieved clinical Antitumor Activity benefit [RECIST complete response (CR)/PR or SD ≥ 4 The antitumor activity of the combination of capivasertib months], 14 (56%) patients had germline BRCA1 or BRCA2 and olaparib is detailed in Table 3, Fig. 3A–C, and Supple mutations [ovarian cancer (n = 7), breast cancer (n = 5), and mentary Table S5. Of the 56 patients who were evaluable castration-resistant prostate cancer (CRPC; n = 2); Table 3; for antitumor response, 19 (34%) patients had RECIST PRs Fig. 3A–C; Supplementary Table S5]. Seven of the remaining and/or tumor marker response [Gynaecologic Cancer Inter patients had pathogenic DDR or PI3K pathway aberrations

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RESEARCH ARTICLE Yap et al. % n Grade 3 or 4 Grade % Olaparib 300 mg BID and n capivasertib BID 480 mg ( n = 6) Grade 1 or 2 Grade % n Grade 3 or 4 Grade % Olaparib 300 mg BID and n Grade 1 or 2 Grade capivasertib BID 400 mg ( n = 7) % n Grade 3 or 4 Grade % Olaparib 300 mg BID and n 00 0.001 0.00 0.0 0 16.7 0 0.0 0.0 0 0 0.0 0 0.0 1 0.0 0 0.0 14.3 0 0 0.0 0 0 0.0 0.0 0 0.0 0.0 0 0 0.0 0 0 0.0 0.0 1 0.0 0.0 1 0 16.7 1 16.7 0 0.0 0 16.7 0 0.0 0 0.0 0 0.0 0.0 0.0 11 16.7 16.7 0 0 0.0 0.0 0 1 0.0 16.7 0 0 0.0 0.0 0 0 0.0 0.0 0 0 0.0 0.0 4 66.70 0 0.0 0.0 0 2 0.0 28.6 0 0 0.0 0.0 0 4 0.0 66.7 1 0 16.7 0.0 0 0.0 01 0.0 16.700 0 02 0.00 0.0 0.0 33.3 0.0 05 0.0 0 1 01 1 0.0 83.3 0 0.0 14.3 16.7 0.0 14.3 1 0 0.0 0 1 0 0 0 14.3 0.0 14.3 1 0.0 0.0 0.0 0.0 0 1 14.3 2 3 0 0 1 0.0 14.3 0 33.3 42.9 0.0 16.7 0.0 0 0 0.0 1 0 1 0 1 0.0 0.0 16.7 0 0.0 16.7 16.7 0.0 5 0 0.0 1 0 2 83.3 0.0 16.7 0 0.0 33.3 0 1 0.0 0.0 16.7 Grade 1 or 2 Grade capivasertib BID 320 mg ( n = 6) Preferred term Eczema Pruritus Rash Rash maculopapular 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 1 16.7 Hematuria Dysgeusia Dizziness Mucosal inflammationMyalgia 2 33.3 0 0.0 2 28.6 0 0.0 1 16.7 0 0.0 Fatigue Neutropenia ThrombocytopeniaAbdominal pain Constipation 1Diarrhea Melena 16.7Mouth ulcerationNausea 0Vomiting 0 0.0 0.0 0 0 0.0 0.0 0 1 0.0 14.3 0 0 0.0 0.0 0 0 0.0 0.0 0 0.0 Treatment-related AEs (maximum grade, all cycles) for olaparib 300 mg BID and capivasertib 4/3 schedule during dose escalation all cycles) AEs (maximum grade, . Treatment-related A disorders conditions able 2 Specific organ class Skin and subcutaneous tissue disorders Dry skin Renal and urinary disorders Nervous system disorders Nervous Musculoskeletal and connective tissue and connective Musculoskeletal Blood and lymphatic system disorders Anemia site disorders and administration General GI disorders T

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Phase I Trial of Olaparib and Capivasertib in Solid Tumors RESEARCH ARTICLE % n Grade 3 or 4 Grade % BID 640 mg ( n = 6) n Grade 1 or 2 Grade Olaparib 300 mg BID and capivasertib % n Grade 3 or 4 Grade % Olaparib 300 mg BID and n Grade 1 or 2 Grade capivasertib BID 560 mg ( n = 6) % n Grade 3 or 4 Grade % Olaparib 300 mg BID and n 00 0.0 0.00 05 0.0 00 62.5 0.0 0.06 0.0 0 01 2 75.0 1 04 0.0 12.5 0.0 33.3 50.0 0 16.7 0.0 00 0 0 1 0.0 0 0 0 0.0 0.0 16.7 0.01 0.00 1 0.0 0.0 12.5 0 0.0 0 01 2 3 16.7 0.00 2 0 12.5 0 0.0 0 0.0 33.3 0.01 0 50.0 33.3 0.0 10 0.0 0 0 0.0 0 12.5 1 3 0.00 0.0 1 12.5 0 0 0.00 0.0 0.0 0 0.0 1 0 0.0 16.71 0 50.0 16.7 0 1 0.0 0.0 0 0 0 0.0 0.0 2 0.0 12.5 16.7 0 0 3 0.0 0 0.0 0 0 16.7 0.0 0 0.0 0.0 0 0 33.3 0.0 0 0 50.0 0.0 0.0 0.0 0.0 0 0 0.0 0 1 0.0 0.0 0 0.0 0 0 0.0 0 0 0.0 0.0 0 0 0 0.0 16.7 0.0 1 0.0 0.0 0 0.0 0 0.0 0.0 0.0 0 0 0.0 16.7 0 1 0.0 0 0 0.0 0.0 0 0.0 0.0 0 1 16.7 0.0 1 0 0.0 0.0 1 0 16.7 0.0 0 16.7 0 0.0 16.7 0 0.0 0.0 0 0.0 0 0.0 0 0.0 0.0 0.0 Grade 1 or 2 Grade capivasertib BID 480 mg ( n = 8) disease Neutropenia Abdominal distensionAbdominal pain Diarrhea Gastroesophageal reflux 0Nausea 0.0Vomiting Fatigue 0Mucosal inflammation candidiasis Oral 0.0 increasedTransaminases 0Hyperglycemia 0 0 0.0Hypokalemia 0.0 0.0Dysgeusia 0Glycosuria 1Cough 0 0.0Dyspnea 12.5Wheezing 0.0 1 0 1 16.7 0.0 16.7 0 0 0.0 0 0.0 0 0.0 0.01 0 16.7 0 0.0 0.0 Preferred term Treatment-related AEs (maximum grade, all cycles) for olaparib 300 mg BID and capivasertib 2/5 schedule during dose escalation all cycles) AEs (maximum grade, . Treatment-related B conditions disorders able 2 GI disorders site disorders and administration General Infections and infestations Investigations Metabolism and nutrition disorders Decreased appetite system disorders Nervous Renal and urinary disorders and mediastinal thoracic Respiratory, Skin and subcutaneous tissue disorders Nail ridging Blood and lymphatic system disorders Anemia Specific organ class T Abbreviations: AE, adverse event; BID, twice a day. event; AE, adverse Abbreviations:

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A 16 (72%) of these 22 patients achieved clinical benefit with the 12,000 combination of olaparib and capivasertib.

10,000 2 R = 0.9644 Patients with Advanced Breast Cancer 8,000 A total of 18 patients with advanced breast cancer were 6,000 enrolled onto the study, 8 (44%) of whom achieved clinical 4,000 benefit (Supplementary Table S5). Five (71.4%) of 7 patients AUC (h*ng/mL) AUC 2,000 with BRCA1/2-mutant breast cancer had clinical benefit; 4 had RECIST PR and 1 had SD of 19.4 weeks, with a median 0 300 400 500 duration of response of 39.1 weeks (range: 14.9–80.9). Two of Dose (mg) these responders with clinical benefit were platinum-resistant. None of the responding patients with advanced breast cancer B 11,000 had prior therapy with PARP or PI3K pathway inhibitors. Patients with Advanced Ovarian Cancer 2 10,000 R = 0.7941 There were a total of 25 patients with advanced ovarian cancer, 11 of whom achieved clinical benefit (Supplemen tary Table S5). Seven (63.6%) of these 11 patients with ger 9,000

AUC (h*ng/mL) AUC mline BRCA1/2-mutant ovarian cancer achieved clinical benefit for a median duration of response of 24 weeks (range 8,000 11.3–115.0); 6 of these 7 patients were platinum-resistant. 400 500 600 700 Four other patients with advanced ovarian cancer who also Dose (mg) achieved clinical benefit included those with tumors harbor ing (i) somatic BRCA1, TP53, and AR mutations, (ii) somatic BRCA2 and TP53 mutations, (iii) somatic PTEN, KRAS, and Figure 1. Dose proportionality of capivasertib during intrapatient SMARCA4 mutations, and (iv) somatic TP53 mutation. dose escalation in both the 4/3 (A) and 2/5 (B) schedules. Pharmacoki- netic modeling was conducted using a noncompartmental extravascular Patients with Advanced CRPC model for plasma using Phoenix WinNonLin Software version 64 (Phar- sight). Once the pharmacokinetic parameters were established for each Of 4 patients with advanced CRPC, 3 had germline BRCA1/2 patient, the mean AUCs to the last sampled timepoint at 12 hours were mutations, of whom 2 achieved clinical benefit (Supplemen plotted against the capivasertib dose administered. tary Table S5). None of the 4 patients had received prior platinum-based chemotherapy. detected, whereas 3 patients did not, and 1 patient did not have available tissue for next-generation sequencing (NGS) Prior PARP Inhibitor– or PI3K Pathway testing. Inhibitor–Exposed Patients Thirteen patients had prior exposure to PARP inhibitors, 5 Antitumor Responses in Patients with DDR and/or PI3K of whom had clinical benefit on this combination study (Sup Pathway Mutations plementary Table S6). One of the patients, who had high-grade Three RECIST-evaluable patients harboring tumors with serous ovarian cancer (HGSOC) with a somatic BRCA2 muta both DDR-related and PI3K pathway mutations achieved tion, achieved RECIST PR and GCIG CA-125 response last RECIST PRs (Fig. 3B). The mutations for these 3 patients were: ing 31 weeks, whereas another patient with platinum-resistant (i) germline ERCC2 mutation, somatic PIK3CA mutation, and germline BRCA2-mutant HGSOC with somatic TP53 mutation PTEN mutations and PTEN IHC loss; (ii) somatic BRCA2 and somatic BRCA1 variant of unknown significance achieved mutation and PTEN IHC loss; and (iii) germline BRCA2 and a GCIG CA-125 response and RECIST SD lasting 56 weeks. PIK3CA mutations, respectively. Eight of 22 (36.4%) patients Another patient, who had previously received a PARP inhibitor, with tumors harboring only DDR-related mutations achieved had platinum-resistant HGSOC harboring a germline BRCA2 RECIST PR, including those with BRCA1 (n = 5), BRCA2 (n = mutation and achieved a GCIG CA-125 response and RECIST 2), and PALB2 (n = 1) mutations. A further 8 patients had a SD on this trial lasting 115 weeks. Only 1 patient had previ best response of SD ≥ 4 months. Among those patients with ously received a PI3K pathway inhibitor prior to this clinical tumors harboring only PI3K pathway mutations (n = 5), there trial; she was a patient with advanced peritoneal mesothelioma was one objective response in a patient with a tumor found who had previously achieved a RECIST PR on a single-agent to have a PTEN mutation. In patients with tumors harboring PI3K pathway inhibitor prior to eventually progressing. On this neither PI3K pathway nor DDR-related mutations (n = 25), clinical trial, she achieved a CA-125 response by GCIG criteria there were two RECIST PRs. and durable RECIST SD lasting 84 weeks before progression.

Patients with BRCA1/2-Mutant Cancers cfDNA Analysis Among 25 patients with BRCA1/2-mutant cancers [20 with A total of 157 cfDNA samples were serially collected from 41 germline BRCA1/2 mutations, 5 with somatic BRCA1/2 patients for analysis on a targeted NGS panel. Of these patients, mutations; breast cancer (n = 7), ovarian cancer (n = 15), and at least one mutation was detected in baseline cfDNA samples CRPC (n = 3)], 22 patients had RECIST measurable disease; from 38 (93%) patients. Of 39 patients where both tumor and

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1.5 1.5 *** *** ** *** ***

1.0 1.0

0.5 0.5 : total GSK3 β signals normalized to baseline normalized to baseline pSe r9 pSer9: total GSK3 β signals pSer9: 0.0 0.0

Baseline Post-cap

Baseline D 0 320 mg D 4 400 mg D 4 480 mg D 4 Post-cap + olap Drug dose/day Timepoint

C D

80 50

Tumor type 40 60 Breast

Breast

30 Breast

Breast 40 Breast

20 Cervical Phosphorylated ERK

BRCA1-positive cells (%) BRCA1-positive Ovarian

20 Ovarian

10 Pancreatic

0 0

Pre Post Pre Post Timepoint

Figure 2. A, Pharmacodynamic profile of capivasertib and olaparib in serially collected PRP during intrapatient dose escalation on a 4/3 schedule. PRP was collected from patients at baseline and predose on day (D) 4 (4/7) at each escalating dose. The PRP was analyzed for the expression of AKT proximal substrate pSer9 GSK3β and total GSK3β. Points represent the levels of pSer9 GSK3β as a percent of the baseline levels normalized to the levels of total GSK3β for individual patients, and orange lines represent mean of all patients at that timepoint. **, P < 0.01; ***, P < 0.001, paired t test compared with baseline. B, Pharmacodynamic profile of capivasertib (cap) and olaparib (olap) in serially collected PRP during dose expansion on a 2/5 schedule. During the cohort expansion, to enable pharmacodynamic studies on the 2/5 schedule, olaparib was administered alone from cycle 0 days −10 to −7, before capivasertib was given alone from cycle 0 days −6 to −3, before both drugs were given in combination from cycle 1 day 1. PRP was collected from patients at baseline (cycle 0 day −10), cycle 0 day −5 (post-capivasertib only), and cycle 1 day 2 (post-capivasertib and olaparib combination). PRP was analyzed for the expression of AKT proximal substrate pSer9 GSK3β and total GSK3β. Points represent the levels of pSer9 GSK3β as a percent of the baseline levels normalized to the levels of total GSK3β for individual patients, and orange lines represent mean of all patients at that timepoint. ***, P < 0.001, one-way ANOVA. C and D, Pharmacodynamic effects of capivasertib and olaparib in paired tumor biopsies during dose expansion on 640 mg twice a day of capivasertib 2/5 and 300 mg twice a day of olaparib. Tumor biopsies were collected from patients at baseline (pre) and cycle 1 day 16 (post). Tumor biopsies were analyzed for the expression of phosphorylated ERK (Fig. 1C) and BRCA1 by IHC (Fig. 1D).

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Table 3. Characteristics of patients who achieved clinical benefit (RECIST CR/PR or SD ≥ 4 months)

Platinum Best response Best response Tumor Responder Pathogenic Pathogenic somatic status Prior PARP Prior PI3K of RECIST of RECIST marker Escalation (highest Duration on patient no. Tumor germline mutation mutation if known inhibitor pathway inhibitor PTEN IHC CR/PR SD ≥ 4 months response Dose schedule dose) or expansion treatment (weeks) 1 Breast BRCA2 BRCA2, PIK3CA RESISTANT — — — cPR Yes cPR 2d-on, 5d-off Escalation (640 mg) 81 2 Breast None detected ERBB2, PIK3CA — — — — SD Yes — 4d-on, 3d-off Escalation (480 mg) 36 3 Breast BRCA1 BRCA1, TP53 — — — — cPR Yes — 4d-on, 3d-off Escalation (480 mg) 39 4 Breast BRCA2, RAD51D BRCA2, RAD51D, RESISTANT — — — SD Yes — 2d-on, 5d-off Expansion 18 ARID1A 5 Breast BRCA1 BRCA1, TP53 SENSITIVE — — — cPR Yes — 2d-on, 5d-off Expansion 51 6 Breast PALB2 PALB2 — — — — cPR Yes cPR 2d-on, 5d-off Expansion 66 7 Breast BRCA1 BRCA1, TP53 — — — — uPR Yes — 4d-on, 3d-off Expansion 15 8 Breast None detected None detected SENSITIVE — — — cPR Yes — 2d-on, 5d-off Expansion 36 9 Endometrial ERCC2 ERCC2, PIK3CA, SENSITIVE — — PTEN loss cPR Yes cPR 4d-on, 3d-off Expansion 29 cancer PTEN, TP53, TSC1 10 Ovarian BRCA1 BRCA1, TP53 RESISTANT PARP inhibitor resistant — — SD Yes — 2d-on, 5d-off Escalation (640 mg) 18 11 Ovarian None detected TP53 SENSITIVE — — — cPR Yes cPR 2d-on, 5d-off Escalation (640 mg) 27 12 Ovarian BRCA2 BRCA2, TP53 RESISTANT PARP inhibitor exposed — — SD Yes — 4d-on, 3d-off Escalation (400 mg) 24 13 Ovarian BRCA1 BRCA1, TP53 RESISTANT — — — cPR Yes cPR 2d-on, 5d-off Escalation (480 mg) 33 14 Ovarian BRCA1 BRCA1, TP53 RESISTANT — — — uPR Yes — 2d-on, 5d-off Expansion 18 15 Ovarian None detected BRCA2, TP53 SENSITIVE PARP inhibitor resistant — PTEN loss cPR Yes cPR 4d-on, 3d-off Expansion 31 16 Ovarian BRCA2 BRCA2 (Plasma only) RESISTANT PARP inhibitor resistant — — SD Yes cPR 4d-on, 3d-off Expansion 115 17 Ovarian None detected PTEN, KRAS, RESISTANT — — — cPR Yes cPR 4d-on, 3d-off Expansion 83 SMARCA4 18 Ovarian None detected BRCA1, AR, TP53 RESISTANT — — — SD Yes cPR 4d-on, 3d-off Expansion 18 19 Ovarian BRCA2 BRCA2, TP53 RESISTANT PARP inhibitor resistant — — SD Yes cPR 4d-on, 3d-off Expansion 56 20 Ovarian BRCA2 BRCA2, NF1, TP53 SENSITIVE — — — cPR No uPR 4d-on, 3d-off Expansion 11 21 Peritoneal None detected None detected SENSITIVE — PI3K inhibitor — SD Yes cPR 4d-on, 3d-off Escalation (480 mg) 84 mesothe- resistant lioma 22 Pleura meso- None detected None detected SENSITIVE — — — SD Yes — 2d-on, 5d-off Escalation (640 mg) 16 thelioma 23 Prostate RAD51D, NTRK1 RAD51D, NTRK1 — — — — SD Yes — 4d-on, 3d-off Escalation (480 mg) 18 24 Prostate BRCA2 BRCA2, CDKN1B — — — — SD Yes cPR 4d-on, 3d-off Escalation (400 mg) 98 25 Prostate BRCA2 BRCA2, TP53 — — — — cPR Yes cPR 2d-on, 5d-off Expansion 21

Abbreviations: cPR, confirmed partial response; uPR, unconfirmed partial response. cfDNA samples were available for analysis, mutation status of germline mutations toward 50% were observed as they at baseline was concordant between tumor and cfDNA sam responded to trial therapy (Supplementary Fig. S2C and S2D). ples in 34 (87.2%) patients. All germline and somatic muta Of 20 patients harboring germline and/or somatic BRCA1/2 tions detected through germline and/or tumor testing were mutations with available cfDNA sampling, 5 patients were detected in cfDNA. The most common mutations detected in found to have BRCA1/2 reversion mutations at disease pro cfDNA included TP53 [n = 26 (63.4%) patients], BRCA2 [n = 11 gression in their end-of-treatment cfDNA samples (Supple (26.8%)], BRCA1 [n = 7 (17.1%)], KRAS [n = 4 (9.8%)], PIK3CA mentary Table S7). One of these patients with advanced [n = 3 (7.3%)], ARID1A [n = 3 (7.3%)], and PTEN [n = 2 (4.9%)]. ovarian cancer, who had early disease progression after 4 weeks The cfDNA allele frequencies of somatic mutations on trial, had a tumor somatic BRCA1 mutation (c.329insA, decreased in selected responding patients and increased p.K110fs*4) in archived tissue, but was found to have a sec upon disease progression (Supplementary Fig. S2A and S2F). ondary BRCA1 mutation deletion restoring the original read In patients with known germline mutations, for example ing frame (c.335_338delATAA) in her cfDNA sample collected BRCA1/2 mutations, falls in the cfDNA allele frequencies at baseline on cycle 1 day 1 and at disease progression.

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Table 3. Characteristics of patients who achieved clinical benefit (RECIST CR/PR or SD ≥ 4 months)

Abbreviations: cPR, confirmed partial response; uPR, unconfirmed partial response.

DISCUSSION macokinetics–pharmacodynamics activity, and antitumor responses in combination with olaparib, by comparing a high In this study, we have shown that the novel combination dose of capivasertib given over a shorter 2/5 schedule versus a of olaparib and capivasertib is well tolerated at biologically lower dose of capivasertib over a longer 4/3 schedule. Overall, effective doses that achieve clinical benefit, including durable this combination was generally well tolerated on both sched responses, in patients with a range of treatment-refractory ules; treatment-related toxicities were reversible and were cancers, including both germline BRCA1/2-mutated tumors mainly GI-related, including diarrhea, mucositis, nausea, and and sporadic cancers harboring actionable somatic altera anorexia. Such potential overlapping GI toxicities were effec tions. Antitumor responses were also observed in patients tively managed with simple supportive measures, such as who had previously developed disease progression on PARP antiemetics and antidiarrheals, when indicated clinically. No and PI3K pathway inhibitors. DLTs were observed on the 2/5 schedule, whereas one DLT Two different intermittent schedules of capivasertib were of reversible grade 3 rash was observed at the highest tested assessed to determine differences in safety, tolerability, phar dose of 480 mg twice a day of capivasertib with 300 mg twice

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A Site Bladder 100 Breast Carcinoma of unknown primary Cervical Cholangiocarcinoma 50 Colorectal

NCM CRPC * PIK3R1 RAD51D PIK3CA PIK3CA FA ERCC2;PIK3CA;PTEN PALB2 PTEN Endometrial * * *** Ovarian * * 0 * Pancreatic RECIST 1.1 (%) Peritoneal mesothelioma * Pleural mesothelioma Uterine carcinosarcoma −50 * BRCA Germline Somatic Not detected −100 Tumor marker response

Best response by PR Pa Br En Br Co Ut Br Ce Ov Ca Ov Ov Ov Br Br Pl CR Br Ov Ce Br Bl Br Pe En Br Br Br Br CR Br Br Br Ch Ov Pa Ov Ov Ov Pa Pa Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov * Previous PARP inhibitor −150 Previous PI3K pathway inhibitor

B C Br Previous PARP inhibitor * Ov 50 * En Previous PI3K pathway inhibitor Br Ov * Ov Site CR Bladder Br * * * Ov ** * Breast Br * * Br * Carcinoma of unknown primary Ov 0 Cervical * Ov CR Cholangiocarcinoma Ov Br * Colorectal Ov CRPC * Ov CR Endometrial Br Ov RECIST 1.1(%) GIST Ov * Ovarian * Br −50 Pancreatic * Ov * CR Peritoneal mesothelioma * Ov * Ov Pleural mesothelioma * Ov Ov Uterine carcinosarcoma Ov Br Tumor marker response Br Ut Br −100 PR Pe Br Driver mutation Ov Pl Best response by LB2 NCM Both DDR or PI3K pathway * Ov

ERCC2;PIK3CA;PTEN PTEN;BRCA2 BRCA2;PIK3CA BRCA1 BRCA1 BRCA2 BRCA2 BRCA1 BRCA1 RAD51D BRCA1 BRCA1 BRCA2 FA BRCA2 BRCA1 BRCA1 BRCA1 BRCA1 PA BRCA2 BRCA1 BRCA2 BRCA2 BRCA1 PTEN PIK3R1 PIK3CA PIK3CA PTEN Ce Ch DDR Ov En Br Br CR Br Br CR Br Br Br Br Ut Br Br Pa En Br Co Br Ca Br Pl Ce Br Bl Pe Br Pa Pa Pa Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ov Ch Ov Ov Ce Ov Ov Ov Ov Ov Neither DDR or PI3K pathway En PI3K pathway Ov * Br Bl BRCA1 Germline Pa Ca BRCA2 IHC loss Co Ov RAD51D IHC normal Pa Reversion (baseline) Br ERCC2 Br FANCM Reversion (by EOT) Gl Br PALB2 Ce PIK3CA Ov

Gene Pa PTEN Mutation Br Br MTOR Not detected Pa Ov PIK3R1 Plasma (only) Pa TSC1 Tumor + plasma TP53 Tumor (only) 0816 24 32 40 48 56 64 72 80 88 96104112 Number of weeks on study

Figure 3. Antitumor response waterfall and swimmer plots with corresponding patient/tumor characteristics. A, Waterfall plot showing best target lesion response by RECIST 1.1 for patients where this could be evaluated. Red bars represent patients harboring germline BRCA1/2 mutations, blue bars represent patients with somatic BRCA1/2 mutations, and gray bars indicate patients who did not have any BRCA1/2 mutations detected. Co-occurring genomic alterations are listed above the respective bars in responding patients without BRCA1/2 mutations detected. Hatched bars indicate patients with a tumor marker response (PSA or CA-125) where these data were available. B, Waterfall plot showing best target lesion response by RECIST 1.1 for patients where this could be evaluated. Mutations used to classify tumors into DDR- or PI3K-mutated, or both, are shown below the bars for each patient, along with abbreviated site of the primary tumor. Hatched bars indicate patients with a tumor marker response (PSA or CA-125) where these data were available. Horizontal dotted lines represent RECIST 1.1 thresholds for progression (+20%) and PR (–30%). Genes with mutations are shown with colored tiles. Tumor + plasma denotes mutations observed in all samples, that is, original tumor and plasma where this was available. Tumor (only) denotes mutation only observed in original tumor sample and absent from subsequent plasma samples. Plasma (only) denotes a mutation observed only in plasma samples and not the original tumor sample. Germline and reversion mutations, as well as PTEN IHC classifications, are shown by symbols as indicated. Genes used to classify the tumors in the waterfall plot (middle), and other genes of interest (bottom). EOT, end of treatment. C, Swimmer plot showing time on study for patients, categorized as in B.

a day of olaparib in the 4/3 schedule. Dose-proportional involving three dose levels, within 7 months and requiring only pharmacokinetics were observed, and proof-of-mechanism a total of 10 patients in each schedule. Apart from optimiz pharmacodynamic studies confirmed AKT pathway modula ing speed and minimizing patient numbers, this prospective tion across dose levels in PRP. Two different combination intrapatient dose escalation has benefits over established phase RP2Ds were established: 400 mg twice a day of capivasertib I escalation strategies, including minimization of patient num with 300 mg twice a day of olaparib for the 4/3 schedule, and bers receiving subtherapeutic drug doses, and safe optimiza 640 mg twice a day of capivasertib with 300 mg twice a day of tion of drug exposures at an individual level to ensure maximal olaparib for the 2/5 schedule. blockade of critical targets for combination strategies. This study employed a prospective intrapatient dose-escala In preclinical studies, inhibition of the PI3K pathway has tion trial design, which enabled the rapid completion of dose- been shown to lead to upregulation of poly-ADP-ribosyla escalation phases of two different combination schedules, each tion and phosphorylation of H2AX, indicating increased

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DNA damage in cells (12). The accumulation of unrepaired The patient with a BRCA1 reversion mutation, detected in DNA double-stranded breaks in BRCA-deficient cells in turn cfDNA at baseline and again at early disease progression, makes them exquisitely sensitive to PARP inhibition, poten had primary resistance to this combination, suggesting that tially accounting for the synergistic effects seen in combined the detection of such aberrations in cfDNA should also be olaparib and capivasertib treatment. Apart from germline considered as part of screening tests prior to PARP inhibi BRCA-mutant breast cancers, preclinical studies have also tor–based therapies (22, 23). demonstrated that PI3K inhibition in triple-negative breast Five (71.4%) of 7 patients with germline BRCA1/2-mutant cancer (TNBC) models drives ERK-dependent activation of breast cancers achieved clinical benefit. In the phase III Olym the ETS transcription factor, which suppresses BRCA gene piAD trial, where patients with germline BRCA1/2-mutant transcription, causing a deficiency of HR activity and PARP HER2-negative metastatic breast cancer were randomized to inhibitor sensitivity (11). Correlative tumor studies from this receive olaparib or single-agent chemotherapy of the physi study have shown increase in tumor phosphorylated ERK cian's choice, the response rate was 59.9% in the olaparib expression associated with decrease in BRCA1 expression group and 28.8% in the standard therapy group (6). Although levels, supporting this hypothesis and rationale for this novel based on small numbers, our study provides preliminary clin combination (14). Given that ERK phosphorylation may ical data that supports the combination of capivasertib with potentially have negative protumor consequences as well, olaparib as a rational strategy to potentially improve patient future studies should investigate whether this may represent benefit beyond that of single-agent olaparib. The addition of a compensatory response that blunts antitumor efficacy. capivasertib to first-line paclitaxel chemotherapy for TNBC The combination of olaparib and capivasertib on both was also shown to lead to significantly longer progression- 4/3 and 2/5 schedules have shown evidence of antitumor free survival (PFS) and overall survival (OS) in a randomized, activity, with clinical benefit observed in 44.6% of evalu double-blind, placebo-controlled phase II trial, particularly in able patients on study. Fourteen (56%) of these 25 respond patients with tumors harboring PIK3CA/AKT1/PTEN altera ing patients harbored germline BRCA1/2 mutations, whereas tions (24). In addition, the FAKTION phase II trial showed 8 (32%) of 25 had relevant somatic aberrations, including that the addition of capivasertib to fulvestrant in patients BRCA2, PIK3CA, PTEN, and PALB2 mutations (Fig. 3A). All 3 with endocrine-resistant, advanced estrogen receptor–posi patients with tumors harboring both DDR-related and PI3K tive breast cancer also resulted in significantly longer PFS and pathway–related aberrations had RECIST PRs, 8 of 23 evalu an observed OS improvement of approximately 6 months, able patients with tumors harboring only DDR-related tumor although this was not statistically significant (37% OS data mutations achieved RECIST PR, and 1 of 5 patients deficient maturity; ref. 25). Phase III trials of capivasertib-based com for PTEN had a RECIST PR (Fig. 2B and C). Importantly, binations are planned or ongoing. clinical benefit was also observed in patients with neither PI3K We observed clinical benefit in 7 of 10 patients (median dura pathway– nor DDR-related tumor mutations detected, as well tion of response for these responders was 24 weeks, range 11.3– as in patients who had previously progressed on PARP or PI3K 115.0) with germline BRCA1/2-mutant ovarian cancer, of which pathway inhibitors. Though based on small numbers, these 6 were platinum-resistant. Overall, 6 (24%) of 25 patients with findings are in keeping with preclinical studies, which indicate advanced ovarian cancer achieved RECIST PR, whereas 5 (20%) that efficacy is not necessarily confined to tumors with action had RECIST SD. An ongoing phase Ib/II trial of olaparib and able mutations such as BRCA1/2 mutations (11, 12). Regard capivasertib in patients with advanced ovarian, endometrial, less, a suitably powered randomized trial will be necessary to and triple-negative breast cancers used the combination RP2D formally determine whether there is synergistic patient benefit established in this trial of 400 mg twice a day of capivasertib in the clinic with this capivasertib and olaparib combination. with 300 mg twice a day of olaparib in the 4/3 schedule. Pre In this study, concordance in the detection of selected liminary results from this trial have shown a RECIST PR rate of mutations between cfDNA and tumor was 87.2%, support 7 (24%) of 30 patients, including RECIST PRs in 4 of 8 patients ing the use of cfDNA for the contemporaneous molecular with recurrent endometrial cancer, 2 patients with TNBC, and profiling of patients. This high concordance may be associ 1 patient with ovarian cancer, as well as RECIST SD ≥ 4 months ated with the large proportion of patients with germline in 6 additional patients (26). This compares with 10 (36%) of mutation cancers included in this trial. Similar to previ 28 patients with ovarian cancer achieving RECIST PR, and 14 ous studies (22), the cfDNA allele frequencies of somatic (50%) attaining RECIST SD in the phase Ib trial of olaparib in mutations decreased in selected responding patients and combination with the α-specific PI3K inhibitor alpelisib (15). increased upon disease progression. Falls in the allele fre In summary, capivasertib in combination with olaparib quencies of germline mutations toward 50% were observed was well tolerated in both 4/3 and 2/5 schedules. Block as they responded to trial therapy, suggesting elimination of ade of AKT led to a downregulation of pSer9 pGSK3β, the tumor clone (22). The development of BRCA1/2 reversion indicating target modulation, while increased pERK and mutations was observed at disease progression in cfDNA decreased BRCA1 expression provided translational mech from 5 (25%) of 20 patients with BRCA1/2-mutant cancers anistic insights into potential synergistic activity between with available cfDNA for analysis (Supplementary Table S7). capivasertib and olaparib. Antitumor activity was observed This finding supportsBRCA reversion as a likely resistance more frequently in patients with either germline BRCA1/2- mechanism in PARP inhibitor–based therapies, including mutant cancers or sporadic cancers with somatic aberrations regimens such as this olaparib–capivasertib combination, along the DDR and PI3K/AKT pathways. There were also and advocates the use of serial cfDNA sampling longi preliminary signals of clinical benefit in platinum-resist tudinally in detecting the emergence of such aberrations. ant HGSOC and in patients who had received prior PARP

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RESEARCH ARTICLE Yap et al. inhibitors. Our results support the development of the com every three treatment cycles, using CT scans evaluated by RECIST bination of olaparib and capivasertib as a promising strategy version 1.1. As appropriate, different tumor markers were used to that warrants further exploration in future clinical trials. assess the effects of study treatment on respective tumor types; for example, serum CA-125 was assessed in patients with ovarian cancer according to GCIG criteria or serum PSA levels were assessed in METHODS patients with CRPC according to PCWG2 criteria. This investigator-initiated study (ClinicalTrials.gov: NCT02338622) Pharmacokinetics and Pharmacodynamics was designed by T.A. Yap and J.S. de Bono, with support from Astra Pharmacokinetics modeling was conducted using a noncompart Zeneca, and conducted in accordance with the provision of the mental extravascular model for plasma with Phoenix WinNonLin Declaration of Helsinki and Good Clinical Practice guidelines. Dose Software version 64 (Pharsight). Pharmacodynamics biomarker escalation was conducted at the Royal Marsden NHS Foundation analysis of pSer9 GSK3β was undertaken on PRP where available, Trust (RM; London, United Kingdom), and the dose-expansion phase using assays validated to Good Clinical Practice standards on the also involved University College London Hospital (London, United MesoScale Discovery (MSD) technology platform (Supplementary Kingdom), Northern Centre for Cancer Care (Newcastle, United Methods; ref. 27). ERK expression was assessed using IHC conducted Kingdom), and Cambridge University Hospitals NHS Foundation on formalin-fixed, paraffin-embedded (FFPE) tissue sections (Sup Trust (Cambridge, United Kingdom). The Central London Research plementary Methods). BRCA1 expression was assessed using BRCA1 Ethics Committee (REC) approved the protocol (REC reference 14/ pan-nuclear IHC staining (Supplementary Methods). LO/0103). The trial was cosponsored by the Institute of Cancer Research (ICR; London, United Kingdom) and RM, and centrally Predictive Biomarker Studies managed by the Drug Development Unit (DDU; Investigator Initiated Trials Team) at the ICR/RM. Funding was provided by the Experi Targeted NGS studies were conducted on patients with available mental Cancer Medicine Centers (ECMC) network, National Institute tumor tissue at the ICR (London, United Kingdom; Supplementary of Health Research, Cancer Research UK (CRUK), and AstraZeneca. Methods); libraries were constructed with the use of GeneRead DNA seq Panel (Qiagen) and run on a MiSeq Sequencer (Illumina). Whole- Study Population exome sequencing was also performed on germline and tumor DNA of responding patients using Illumina HiSeq 2500 in paired-end Eligible patients had histologically confirmed advanced solid mode. Variants were annotated as pathogenic if considered “patho tumors refractory to standard therapies and Eastern Cooperative genic” or “likely pathogenic” according to the ClinVar database (28) Oncology Group performance status (ECOG PS) 0–1. Complete eli and/or ACMG classification using VarSome (29). PTEN loss was gibility criteria are available in the Supplementary Data. Dose-expan assessed by IHC performed on FFPE tissue sections from archived sion cohorts mandated patients with germline BRCA1/2-mutated tumors where available, as described previously (30). tumors (cohort A) or germline BRCA1/2 wild-type patients with spo radic tumors likely to harbor HR defects or demonstrating somatic Statistical Analysis aberrations known to result in a hyperactivated PI3K–AKT pathway Analysis was conducted after all the patients had received one cycle (or defective DNA repair; cohort B). The dose-escalation cohort was of treatment and had completed their last study visit conducted 28 enriched for patients with characteristics mandated in expansion days after the last dose of combination treatment. Patients were cohorts A and B, but this was not a requirement. Written informed evaluable for antitumor efficacy assessment if they had a baseline consent was obtained from all patients. RECIST assessment and at least one post-baseline RECIST assess ment. Under the assumption that the true underlying CBR was 20%, Trial Design with anticipated recruitment of 40 patients in the expansion phase, This was an open-label, multicenter phase Ib trial assessing the there would be a < 1% chance of seeing no responses, and a > 99% combination of olaparib and capivasertib in patients with advanced chance of observing two or more responses. solid tumors. The primary objectives were to determine the safety and tolerability of olaparib in combination with capivasertib, and to Disclosure of Potential Conflicts of Interest establish a MTD and/or RP2D of this combination. Secondary objec T.A. Yap reports grants and non-financial support from AstraZen tives included the characterization of pharmacokinetic and phar eca during the conduct of the study; grants, personal fees, and non- macodynamic profiles of both agents in combination. Exploratory financial support from AstraZeneca outside the submitted work; objectives included the assessment of preliminary antitumor activity research support (to institution) from Artios, Bayer, Clovis, Constel of the combination and evaluation of putative predictive biomarkers lation, Cyteir, Eli Lilly, EMD Serono, Forbius, F-Star, GlaxoSmith of response and resistance. Study conduct was overseen by an SRC, Kline, Genentech, ImmuneSensor, Ipsen, Jounce, Karyopharm, comprising the chief investigator, principal investigator or delegate Kyowa, Merck, Novartis, Pfizer, Ribon Therapeutics, Regeneron, from each investigational site, DDU pharmacovigilance officer or del Repare, Sanofi, Scholar Rock, Seattle Genetics, Tesaro, and Vertex egate, CR-UK's Drug Development Office medical advisor or delegate, Pharmaceuticals, and the following consultancies: Almac, Aduro, an observer from AstraZeneca, a Clinical Trials Manager or delegate, AstraZeneca, Atrin, Axiom, Bayer, Bristol-Myers Squibb, Calithera, an independent senior ECMC network clinician, and a Royal Marsden Clovis, Cybrexa, EMD Serono, F-Star, Guidepoint, Ignyta, I-Mab, Hospital representative who was independent of the study team. Janssen, Merck, Pfizer, Repare, Roche, Rubius, Schrodinger, Seattle Genetics, Varian, and Zai Lab. R. Kristeleit reports personal fees from Prospective Intrapatient Dose Escalation AstraZeneca (conference travel, consultancy, and advisory boards), This phase I trial utilized a prospective intrapatient dose-escalation GlaxoSmithKline (conference travel, consultancy, and advisory trial design, where doses of capivasertib were prospectively escalated board), and Basilea (consultancy); grants and personal fees from Clo in each patient in combination with a fixed continuous dose of olapa vis (conference travel, fellow grant, consultancy, and advisory boards), rib (Supplementary Fig. S1; Supplementary Methods). and Merck (trial grant and consultancy), and personal fees from Toxicities and laboratory variables were assessed using the Com Sierra Oncology (conference travel and consultancy) outside the sub mon Terminology Criteria for Adverse Events version 4.0. Patients mitted work. J.S.J. Lim reports personal fees from Pfizer (honorarium had safety evaluations weekly and tumor response assessments after and consulting), AstraZeneca (honorarium and consulting), and

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Novartis (honorarium and consulting) outside the submitted work. work. J.P.O. Lindemann reports other support from AstraZeneca R. Miller reports personal fees and non-financial support from Astra (employee) during the conduct of the study. A. Foxley reports other Zeneca, personal fees from Tesaro-GlaxoSmithKline and Roche, support from AstraZeneca (employee) during the conduct of the grants and personal fees from MSD, and personal fees from Clovis study. C.J. Lord reports grants and personal fees from AstraZeneca, Oncology outside the submitted work. D. Nava Rodrigues reports Merck KGaA, and Artios, personal fees from Syncona, Sun Pharma, other support from AstraZeneca (shareholder) during the conduct of Gerson Lehrman Group, Vertex, and Ono Pharma, personal fees and the study. N.C. Turner reports grants and personal fees from Astra other support from Tango (stock), and other support from Ovibio Zeneca, Merck Sharpe & Dohme, Pfizer, and Roche/Genentech, per (stock) outside the submitted work; he has a patent for PARP inhibi sonal fees from Bristol-Myers Squibb, Lilly, Novartis, Bicycle tors and stands to gain as part of the ICR (rewards to inventors) Therapeutics, Taiho, Zeno Pharmaceuticals, and Repare Therapeu scheme issued and with royalties paid from AstraZeneca. U. Banerji tics, non-financial support from Bio-Rad, grants from Clovis, and reports other support from The Institute of Cancer Research non-financial support from Guardant Health outside the submitted (employee of The Institute of Cancer Research, which is involved in work. F.I. Raynaud reports other support from The Institute of Can the development of PI3K, HSP90, HDAC, AKT, ROCK, RAF, CHK1, cer Research (involved in the development of AKT inhibitors leading and HSF1 inhibitors) during the conduct of the study as well as to AZD5363) outside the submitted work. S. Decordova reports grants from AstraZeneca [phase I IIT (TAX-TORC)], Onyx [phase I grants from CRUK [grant number (C309/A11566) support of the IIT (ONX-0801)], BTG International (additional funding ONX- Clinical PD Biomarker Group Laboratory equipment servicing and 0801), Carrick Therapeutics [phase I IIT CT900 (previously ONX- maintenance] during the conduct of the study as well as other sup 0801)], Chugai Pharma Japan (phase I IIT RO5126766), and port from Boston Pharmaceutical Inc. (salary and research funding), Verastem/Chugai Pharma Japan [phase I IIT (FRAME)], personal fees Menarini Ricerche (salary and research funding), AstraZeneca (salary from Astellas (Precision Med - Advanced Prostate Cancer Mtg, Lon and research funding), and CRUK (salary and research funding) out don, United Kingdom, November 2018), Novartis (Transl Clin side the submitted work. K.E. Swales reports grants from CRUK Oncology Adv Bd, London, United Kingdom, July 2018), Karus [CRUK (grant number C347/A18077) funds Karen Swales post and Therapeutics (Clin Adv Bd, London, United Kingdom, March 2018), CRUK (grant number C309/A11566) support of the Clinical PD Bio Phoenix Solutions (GI Adv Bd, London, United Kingdom, December marker Group Laboratory equipment servicing and maintenance] 2, 2017), Eli Lilly (Eur Digestive Oncology Res Forum, London, during the conduct of the study as well as other support from Astra United Kingdom, November 2017), Janssen (Business Dev Clin Panel, Zeneca (research funding), Bayer (research funding), Boston Pharma Philadelphia, October 2019), and Boehringer-Ingelheim [BETi in ceuticals Inc. (research funding), Sierra Oncology (research funding), NUT carcinoma (2019–2020), Boston, MA, October 2019], and other Menarini Ricerche (research funding), and Merck (research funding) support from Bayer (return travel to attend BAY19829 Investigator outside the submitted work, and reports employment with The Insti Mtg, Houston, January 2020) outside the submitted work. R. Plum tute of Cancer Research, which is involved in the development of mer reports other support from Cancer Research UK (trial costs) PI3K, HSP90, HDAC, AKT, ROCK, RAF, CHK1, and HSF1 inhibitors. during the conduct of the study. B. Basu reports other support from L. Finneran reports grants from AstraZeneca (grant provided to insti GenMab (consultancy), Roche (advisory board), and Eisai Europe tution for database and statistical support for this project) during Limited (advisory board), grants from Celgene (investigator initiated the conduct of the study as well as grants from AstraZeneca (grant trial), non-financial support from Bayer (travel and registration for provided to institution to support salary) outside the submitted Congress), and other support from Eisai Europe Limited (speakers work. E. Hall reports non-financial support from AstraZeneca (study bureau) outside the submitted work. J.S. Lopez reports grants from drug supplied by AstraZeneca), grant funding to support central trial AstraZeneca during the conduct of the study as well as Roche Genen management and running costs at ICR-CTSU during the conduct of tech, grants and personal fees from Basilea, and grants from Genmab the study, as well as grants from Kyowa Hakko UK (educational grant outside the submitted work. Y. Drew reports grants and personal fees to ICR to support central trial costs at ICR-CTSU for the BOXIT trial from AstraZeneca outside the submitted work. J.S. de Bono reports in intermediate/high risk non-muscle invasive bladder cancer) and grants from AstraZeneca (trial funded by AstraZeneca) during the Alliance Pharma (was Cambridge Laboratories; educational grant to conduct of the study as well as grants, personal fees, and non-finan ICR to support central trial costs at ICR-CTSU for the BOXIT trial in cial support from AstraZeneca (advisory board), grants from Pfizer intermediate/high risk non-muscle invasive bladder cancer), grants (advisory board), personal fees from Merck Serono (advisory board), and non-financial support from Merck Sharpe & Dohme [educa MSD (advisory board), Daiichi (advisory board), Sanofi Aventis (advi tional grant to host institution (ICR) to support central trial costs at sory board), Bayer (advisory board), Janssen (advisory board), Amgen ICR-CTSU and IMP supplies for an investigator-initiated prostate (advisory board), and Genentech Roche (advisory board) outside the cancer study], Bayer Healthcare Pharmaceuticals Inc. (educational submitted work; ICR has a patent on PARPi for DNA repair cancers grant to ICR to support central trial costs at ICR-CTSU for an inves issued, and ICR has a commercial interest in capivasertib issued; and tigator-initiated cancer study), AstraZeneca (educational grant to he has served as the chief investigator of trials with olaparib as well as ICR to support central trial costs at ICR-CTSU for investigator-initi capivasertib and the AKT inhibitor ipatasertib. No potential conflicts ated prostate cancer studies), Accuray Inc. (grant received by institu of interest were disclosed by the other authors. tion as contribution to the central trial management of the PACE clinical trial of SBRT in prostate cancer), Aventis Pharma Limited Authors' Contributions (Sanofi; educational grant to ICR to support central trial costs at T. Yap: Conceptualization, resources, data curation, formal ICR-CTSU for investigator-initiated prostate and penile cancer stud analysis, supervision, funding acquisition, validation, investigation, ies), and Janssen-Cilag (grant received by institution as contribution visualization, methodology, writing-original draft, project adminis to support trial health economic evaluation in an academic trial in tration, writing-review and editing. R. Kristeleit: Resources, super prostate cancer), and grants from Varian Medical Systems Inc. (grant vision, investigation, project administration, writing-review and received by institution as contribution to support central trial costs editing. V. Michalarea: Resources, writing-review and editing. S.J. at ICR-CTSU for an academic prostate radiotherapy trial) and Roche Pettitt: Resources, data curation, formal analysis, validation, inves Products Ltd. (grant received by institution as contribution to sup tigation, visualization, methodology, writing-original draft, writing- port central trial costs at ICR-CTSU for an academic bladder cancer review and editing. J.S.J. Lim: Resources, writing-original draft, trial) outside the submitted work. P. Rugman reports other support writing-review and editing. S. Carreira: Resources, data curation, from AstraZeneca (employee of AstraZeneca) outside the submitted formal analysis, supervision, validation, investigation, visualization,

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Figueiredo: Cancer Center, Houston, TX) for helpful discussions on cfDNA Resources, data curation, formal analysis, validation, investigation, studies. writing-review and editing. D. Nava Rodrigues: Resources, data curation, formal analysis, validation, investigation, writing-review Received February 15, 2020; revised May 20, 2020; accepted June 9, and editing. S. Ward: Data curation, investigation, writing-review 2020; published first June 12, 2020. and editing. R. Matthews: Data curation, investigation, writing- review and editing. M. Parmar: Resources, data curation, software, formal analysis, supervision, validation, investigation, visualization, writing-original draft, project administration, writing-review and References editing. A. Turner: Supervision, project administration, writing- . 1 Bryant HE, Schultz N, Thomas HD, Parker KM, Flower D, Lopez E, review and editing. N. Tunariu: Resources, data curation, formal et al. 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Phase I Trial of Olaparib and Capivasertib in Solid Tumors RESEARCH ARTICLE

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Phase I Trial of the PARP Inhibitor Olaparib and AKT Inhibitor Capivasertib in Patients with BRCA1/2- and Non−BRCA1/2 -Mutant Cancers

Timothy A. Yap, Rebecca Kristeleit, Vasiliki Michalarea, et al.

Cancer Discov Published OnlineFirst June 12, 2020.

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