Multiple Technology Appraisal Avatrombopag and Lusutrombopag
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Multiple Technology Appraisal Avatrombopag and lusutrombopag for treating thrombocytopenia in people with chronic liver disease needing an elective procedure [ID1520] Committee papers © National Institute for Health and Care Excellence 2019. All rights reserved. See Notice of Rights. The content in this publication is owned by multiple parties and may not be re-used without the permission of the relevant copyright owner. NATIONAL INSTITUTE FOR HEALTH AND CARE EXCELLENCE MULTIPLE TECHNOLOGY APPRAISAL Avatrombopag and lusutrombopag for treating thrombocytopenia in people with chronic liver disease needing an elective procedure [ID1520] Contents: 1 Pre-meeting briefing 2 Assessment Report prepared by Kleijnen Systematic Reviews 3 Consultee and commentator comments on the Assessment Report from: • Shionogi 4 Addendum to the Assessment Report from Kleijnen Systematic Reviews 5 Company submission(s) from: • Dova • Shionogi 6 Clarification questions from AG: • Questions to Shionogi • Clarification responses from Shionogi • Questions to Dova • Clarification responses from Dova 7 Professional group, patient group and NHS organisation submissions from: • British Association for the Study of the Liver (BASL) The Royal College of Physicians supported the BASL submission • British Society of Gastroenterology (BSG) 8 Expert personal statements from: • Vanessa Hebditch – patient expert, nominated by the British Liver Trust • Dr Vickie McDonald – clinical expert, nominated by British Society for Haematology • Dr Debbie Shawcross – clinical expert, nominated by Shionogi © National Institute for Health and Care Excellence 2019. All rights reserved. See Notice of Rights. The content in this publication is owned by multiple parties and may not be re-used without the permission of the relevant copyright owner. MTA: avatrombopag and lusutrombopag for treating thrombocytopenia in people with chronic liver disease needing an elective procedure Pre-meeting briefing © NICE 2019. All rights reserved. Subject to notice of rights. The content in this publication is owned by multiple parties and may not be re-used without the permission of the relevant copyright owner. This slide set is the pre-meeting briefing for this appraisal. It has been prepared by the technical team with input from the committee lead team and the committee chair. It is sent to the appraisal committee before the committee meeting as part of the committee papers. It summarises: – the key evidence and views submitted by the companies, the consultees and their nominated clinical experts and patient experts and – the Assessment Group report It highlights key issues for discussion at the first appraisal committee meeting and should be read with the full supporting documents for this appraisal. Please note that this document is a summary of the information available before comments on the assessment report have been received. The lead team may use, or amend, some of these slides for their presentation at the committee meeting. 2 Key issues (1) N.B. Avatrombopag does not currently have an agreed list price. Therefore the clinical effectiveness of avatrombopag can be considered, but the cost effectiveness will be considered at a later meeting. For now, the AG have assumed the list price is the same as lusutrombopag • What treatments do patients currently receive in clinical practice? – When are platelets indicated? – Are any other prophylactic treatments given? – What types of rescue therapy are given? • How soon before surgery would a patient be eligible for treatment with avatrombopag/lusutrombopag? • What affects risk of a bleed with invasive procedure in people with thrombocytopenia? • Are the trial protocols generalisable to UK treatment pathway? • How do differences between trials affect – Robustness of results from network meta analysis? 3 Key issues (2) • Platelet transfusions are a large cost in the model. What volume (or “adult therapeutic dose”) would be given in clinical practice? • What is the expected mortality due to platelet transfusion in people with chronic liver disease? • Indirect analyses show almost no statistically significant differences between the 2 therapies for key outcomes. Should the model assume there are differences? • In clinical practice, operations may be cancelled if the patient is not fit enough. Should this carry a sunk cost in the model? • What proportion of patients currently receive platelet transfusions prior to surgery in clinical practice? • Is there evidence that some people become refractory to platelet transfusion? • These are the first oral treatments for this disease area. Can the treatments be considered innovative? – Are there benefits not captured in the model • e.g. avoidance of blood products, which are more difficult for the NHS logistically compared with an oral treatment, and carry more risk of infection? • The AG base case suggests that the treatment is highly cost-ineffective. However, this is driven by very small utilities, making the ICER unstable 4 Disease background: thrombocytopenia • Reduced number of circulating platelets in blood – Normally classified as platelet count <150,000/µL of blood – This increases risk of excessive bleeding • Common complication of chronic liver disease because of: – The disease itself – A consequence of interferon-based antiviral therapy following liver infection • Severe thrombocytopenia increases risk of excessive bleeding during liver transplantation or procedures such as liver biopsy • Prevalence among people with chronic liver disease estimated 15 to 70%, depending on stage of disease and differences in thrombocytopenia definition 5 Current treatments • No other licensed treatments • Therapies include stimulation of megakaryocyte maturation and platelet production • Options for severe thrombocytopenia include platelet transfusion, splenic artery emoblisation and splenectomy • NICE clinical guideline (CG24) recommends considering platelet transfusion before an invasive procedure or surgery to raise platelet count above: – 50,000/µL for any type of patient – 50,000-75,000/µL for patients with high risk of bleeding, depending on procedure, aetiology, whether platelet count is stable, any other cause of abnormal haemostasis – 100,000/µL in critical sites, e.g. central nervous system (including posterior segment of the eyes) No standard risk assessment algorithm or prophylactic treatment protocol People with Assess risk of Treat with platelet Have Have rescue chronic liver bleeding with transfusion as invasive therapy to disease and planned invasive needed procedure stop a bleed if thrombocytopenia procedure needed Lusutrombopag or 6 avatrombopag? Professional organisation submissions (1) British Society of Gastroenterology: • Variable disease management across the NHS because: – lack of clear evidence base – poor understanding of platelet function in liver disease • Thrombocytopenia in advanced liver disease usually seen with cirrhosis with portal hypertension; can be permanent and progressive • Avatrombopag and lusutrombopag would act as a substitute to prophylactic platelet transfusion, advantages of this are: – gradual and predictable increase in platelet count (in outpatient care) – sustained elevation in platelet count – avoids use of a blood product (limited national resource, potential for cross contamination and potential serious adverse effects) – hypothetical advantage of stopping delayed bleeding after procedures 7 Professional organisation submissions (2) British Association of the Study of the Liver (endorsed by Royal College of Physicians): • No alternative drug therapies; current treatment is platelet transfusion at time of procedure • No consensus about whether platelet transfusion reduces risk for medium or small procedures • Avatrombopag and lusutrombopag could be used for all cirrhotic patients with thrombocytopaenia who require an intervention • As these are new technologies experience in use and monitoring of dose/ duration required 8 CONFIDENTIAL Interventions Lusutrombopag (Mulpleta) Avatrombopag (Doptelet) Company Shionogi Inc Dova Pharmaceuticals Mechanism of Small molecule thrombopoietin receptor agonist, stimulates platelet action production Marketing “treatment of severe thrombocytopenia in adult patients with chronic liver authorisation disease… “…undergoing invasive procedures” (lusutrombopag) “…who are scheduled to undergo an invasive procedure” (avatrombopag) Administration Oral administration: Oral administration: and dose • 3mg* for 7 days • 60mg if baseline platelet count • Baseline count <50,000/µL <40,000/µL • 40 mg if baseline platelet count is 40,000 to <50,000/µL For 5 days Timing of 9 days after start of treatment 10 to 13 days after start of treatment procedure Price £x for seven days of 3 mg TBC: AG assumes same as lusutrom *Assessment Group reports lusutrombopag results by subgroups based on avatrombopag dosing regimen 9 Decision problem Final NICE scope Assessment group Population Adults with thrombocytopenia Population split into 2 subgroups to allow associated with chronic liver disease comparison of lusutrobopag with the 2 needing an elective procedure doses of avatrombopag, platelet count: • <40,000/µL • 40,000 to <50,000/µL Interventions • Avatrombopag Stated that avatrombopag and • Lusutrombopag lusutrombopag are used alongside established clinical management Comparators Established clinical management Established clinical management (including, but not limited to platelet (including, but not limited to platelet transfusion) transfusion)