Lynparza in combination with abiraterone recommended for approval in the EU by CHMP as 1st-line treatment for patients with metastatic castration-resistant prostate cancer

On Nov 15, 2022

AstraZeneca and MSD’s Lynparza (olaparib) in combination with abiraterone and prednisone or prednisolone has been recommended for marketing authorisation in the European Union (EU) for the treatment of adult patients with metastatic castration-resistant prostate cancer (mCRPC) for whom chemotherapy is not clinically indicated.

The Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency based its positive opinion on results from the PROpel Phase III trial which were published in NEJM Evidence in June 2022.

In the trial, Lynparza in combination with abiraterone and prednisone or prednisolone, reduced the risk of disease progression or death by 34% versus abiraterone alone (based on a hazard ratio [HR] of 0.66; 95% confidence interval [CI] 0.54-0.81; p<0.0001). Median radiographic progression-free survival (rPFS) was 24.8 months for Lynparza plus abiraterone versus 16.6 months for abiraterone alone. Results also showed that Lynparza in combination with abiraterone extended median rPFS by almost one year, with a median rPFS of 27.6 months versus 16.4 with abiraterone alone, as assessed by blinded independent central review (BICR).

Updated results also showed a favourable trend in improved overall survival with Lynparza plus abiraterone versus abiraterone alone, however the difference did not reach statistical significance at the time of this data cut-off (analysis at 40% data maturity).

Prostate cancer is the most common cancer in men in Europe, with an estimated 473,000 patients diagnosed and 108,000 deaths in 2020. Overall survival for patients with mCRPC is approximately three years in clinical trial settings, and even shorter in real-world settings. Approximately half of patients with mCRPC may receive only one line of active treatment, with diminishing benefit of subsequent therapies.

Noel Clarke, Urological Surgeon and Professor of Urological Oncology at Manchester’s Christie/Salford Royal Hospitals and Manchester University, the PROpel trial joint senior investigator, said: “Patients with metastatic castration-resistant prostate cancer in the European Union have limited treatment options. This form of advanced prostate cancer has a poor prognosis and treatment decisions after initial diagnosis are critical. If approved in the European Union for prostate cancer of this type, olaparib in combination with abiraterone will provide a much-needed new treatment option for the many men with this condition.”

Susan Galbraith, Executive Vice President, Oncology R&D, AstraZeneca, said: “With the incidence and mortality of prostate cancer set to double in the coming decades, it is more important than ever that we bring new treatment options to suitable patients at the earliest possible moment in their care. If approved, Lynparza in combination with abiraterone and prednisone or prednisolone will represent the first combination of a PARP inhibitor and new hormonal agent available to patients in the European Union.”

Eliav Barr, Senior Vice President, Head of Global Clinical Development and Chief Medical Officer, MSD Research Laboratories, said: “While prostate cancer has seen many advances in care in recent decades, for those with mCRPC, new treatment options are urgently needed. We are fully committed to bringing Lynparza in combination with abiraterone and prednisone or prednisolone to suitable patients in the European Union as quickly as possible.”

Lynparza in combination with abiraterone and prednisone or prednisolone is undergoing Priority Review in the US for the treatment of mCRPC in adult patients based on results from the PROpel Phase III trial, with a decision expected in Q4 2022.

Lynparza is approved in the US based on results from the PROfound Phase III trial as monotherapy for patients with homologous recombination repair (HRR) gene-mutated mCRPC (BRCA-mutated and other HRR gene mutations) who have progressed following prior treatment with enzalutamide or abiraterone; and in the EU, Japan, and China for patients with BRCA-mutated mCRPC who have progressed following prior therapy that included a new hormonal agent.