TRACON Pharmaceuticals, Inc. IND 132664 5.3.3.2 Clinical Study Protocol 253PC101 Protocol Amendment #4 Dated 30May2019 IN CASE OF EMERGENCY Table 1: Emergency Contact Information Role in Study Name Address and Telephone number Primary Medical Monitor James Freddo, MD 4350 La Jolla Village Drive, Suite 800 San Diego, CA 92122 Mobile Phone: 1.858.472.2330 Facsimile: 1.858.550.0786 Email:
[email protected] Secondary Medical Monitor Charles Theuer, MD, PhD 4350 La Jolla Village Drive, Suite 800 San Diego, CA 92122 Office: 1.858.550.0780 x233 Mobile Phone: 1.858.344.9400 Email:
[email protected] Confidential Page 2 of 102 TRACON Pharmaceuticals, Inc. IND 132664 5.3.3.2 Clinical Study Protocol 253PC101 Protocol Amendment #4 Dated 30May2019 1. SYNOPSIS Name of Sponsor/Company: TRACON Pharmaceuticals, Inc. Name of Investigational Product: TRC253 Name of Active Ingredient: TRC253-HCl Title of Study: AN OPEN-LABEL PHASE 1/2A STUDY TO EVALUATE THE SAFETY, PHARMACOKINETICS, PHARMACODYNAMICS, AND PRELIMINARY EFFICACY OF TRC253, AN ANDROGEN RECEPTOR ANTAGONIST, IN PATIENTS WITH METASTATIC CASTRATION-RESISTANT PROSTATE CANCER Study center(s): 6 centers in Part 1, and approximately 20 centers in Part 2, in the United States Studied period: Phase of development: 1/2A Date first patient enrolled: May 2017 Date of determination of recommended phase 2 dose (RP2D): July 2018 Estimated date last patient enrolled: April 2021 Estimated date last patient completed: October 2021 Rationale: TRC253 is a high-affinity, small molecule antagonist of the androgen receptor (AR) with inhibitory activity against wild type AR and specific mutated variants of AR.