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AstraZeneca Lynparza granted orphan drug designation in Japan

AstraZeneca plc (LON:AZN) today announced that Lynparza (olaparib) has been granted orphan drug designation (ODD) in Japan for the maintenance treatment of germline BRCA-mutated (gBRCAm) curatively unresectable pancreatic cancer. Lynparza is co-developed and co-commercialised with MSD Inc., Kenilworth, N.J., US (MSD: known as Merck & Co., Inc. inside the US and Canada).

The Japanese Ministry of Health, Labour and Welfare grants ODD to medicines intended for the treatment of diseases that affect fewer than 50,000 patients in Japan and for which there is a high unmet medical need.

Pancreatic cancer has the lowest survival rate of the most common cancers and is the only major cancer with a five-year survival rate below 10% in almost every country.

José Baselga, Executive Vice President, R&D Oncology, said: “Japan has the fifth-highest incidence of pancreatic cancer worldwide and patients have seen limited treatment advances over the last few decades. This designation is an important step forward in bringing the first targeted medicine to biomarker-selected patients with advanced pancreatic cancer in Japan.”

Roy Baynes, Senior Vice President and Head of Global Clinical Development, Chief Medical Officer, MSD Research Laboratories, said: “A pancreatic cancer diagnosis is devastating and we are committed to research that aims to change the prognosis for patients. The POLO trial demonstrated that treatment with Lynparza extended time without disease progression or death in patients with germline BRCA-mutated metastatic pancreatic cancer and we are hopeful that we will be able to bring this treatment to patients in Japan soon.”

The Phase III POLO trial showed Lynparza nearly doubled the time patients with gBRCAm metastatic pancreatic cancer lived without disease progression or death to a median of 7.4 months versus 3.8 months on placebo. The safety and tolerability profile of Lynparza in the POLO trial was in line with that observed in previous trials.

Lynparza was approved in the US as a 1st-line maintenance treatment for patients with gBRCAm metastatic pancreatic cancer in December 2019 with ongoing regulatory reviews in the EU and other jurisdictions.

Pancreatic cancer

Pancreatic cancer is a deadly cancer with a high unmet medical need. The disease has the lowest survival rate of the most common cancers.1 Japan has the fifth-highest rate of pancreatic cancer in the world with 43,000 new cases diagnosed in 2018.2,3 Pancreatic cancer is the fourth leading cause of cancer death in Japan, resulting in 37,000 deaths in 2018.3

Globally, pancreatic cancer is the 11th-most commonly occurring cancer and the seventh leading cause of cancer death.4,5 There were approximately 460,000 new cases worldwide in 2018.5 As there are often no symptoms, or symptoms may be non-specific in the early stages, it is most commonly diagnosed at an incurable stage.6,7 Around 80% of pancreatic cancer patients are diagnosed when the disease has metastasised, at which point average survival is less than a year.8 Despite advances in treatment, few improvements have been made in diagnosis and treatment in the past few decades.9 Current treatment is surgery (for which approximately only 10-20% of patients are eligible), chemotherapy and radiotherapy, highlighting a critical unmet medical need for more effective treatment options.10

POLO

POLO is a Phase III randomised, double-blind, placebo-controlled, multi-centre trial of Lynparza tablets (300mg twice daily) as maintenance monotherapy versus placebo. The trial randomised 154 patients with gBRCAm metastatic pancreatic cancer whose disease had not progressed on 1st-line platinum-based chemotherapy. Patients were randomised (3:2) to receive Lynparza or placebo until disease progression. The primary endpoint was progression-free survival (PFS) and key secondary endpoints included overall survival (OS), time to second disease progression, overall response rate and health-related quality of life.

The results showed a statistically significant and clinically meaningful improvement in PFS, where Lynparza nearly doubled the time patients with gBRCAm metastatic pancreatic cancer lived without disease progression or death to a median of 7.4 months versus 3.8 months on placebo and reduced the risk of disease progression or death by 47% (HR 0.53 [95% confidence interval (CI), 0.35-0.82], p=0.004). In patients with measurable disease at baseline, 23% responded to Lynparza versus 12% on placebo (odds ratio, 2.30 [95% CI, 0.89-6.76]) and had a median duration of treatment in excess of two years (24.9 months [95% CI, 14.8-could not be calculated]) versus 3.7 months on placebo (95% CI, 2.10-could not be calculated). The median OS, a secondary endpoint, at interim analysis and at a data maturity of 46% was 18.9 months for Lynparza versus 18.1 months for placebo but did not reach statistical significance (HR=0.91; p=0.68).

The safety and tolerability profile of Lynparza in the POLO trial was in line with that observed in previous trials.

BRCA mutations

BRCA1 and BRCA2 (breast cancer susceptibility genes 1/2) are human genes that produce proteins responsible for repairing damaged DNA and play an important role in maintaining the genetic stability of cells. When either of these genes is mutated, or altered, such that its protein product either is not made or does not function correctly, DNA damage may not be repaired properly, and cells become unstable. As a result, cells are more likely to develop additional genetic alterations that can lead to cancer.

Lynparza

Lynparza (olaparib) is a first-in-class PARP inhibitor and the first targeted treatment to block DNA damage response (DDR) in cells/tumours harbouring a deficiency in homologous recombination repair, such as mutations in BRCA1 and/or BRCA2. Inhibition of PARP with Lynparza leads to the trapping of PARP bound to DNA single-strand breaks, stalling of replication forks, their collapse and the generation of DNA double-strand breaks and cancer cell death. Lynparza is being tested in a range of PARP-dependent tumour types with defects and dependencies in the DDR pathway.

Lynparza is currently approved in a number of countries, including those in the EU, for the maintenance treatment of platinum-sensitive relapsed ovarian cancer. It is approved in the US, the EU, Japan, China, and several other countries as 1st-line maintenance treatment of BRCA-mutated advanced ovarian cancer following response to platinum-based chemotherapy. It is also approved in the US, Japan, and a number of other countries for germline BRCA-mutated, HER2-negative, metastatic breast cancer, previously treated with chemotherapy; in the EU, this includes locally advanced breast cancer. In 2019, Lynparza was additionally approved in the US for the treatment of germline BRCA-mutated metastatic pancreatic cancer. Regulatory reviews are underway in several jurisdictions for ovarian, breast, pancreatic and prostate cancers.

Lynparza, which is being jointly developed and commercialised by AstraZeneca and MSD, has been used to treat over 30,000 patients worldwide. Lynparza has the broadest and most advanced clinical trial development programme of any PARP inhibitor, and AstraZeneca and MSD are working together to understand how it may affect multiple PARP-dependent tumours as a monotherapy and in combination across multiple cancer types. Lynparza is the foundation of AstraZeneca’s industry-leading portfolio of potential new medicines targeting DDR mechanisms in cancer cells.

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