Onivyde (irinotecan liposome injection) for the Treatment of Metastatic Pancreatic Cancer

Onivyde (MM-398 / irinotecan liposome injection) is an intravenous injection indicated for the treatment of metastatic pancreatic cancer.

The drug was developed by Merrimack Pharmaceuticals in collaboration with Baxalta, a subsidiary of Baxter.

The drug’s development, manufacturing and commercialisation rights in Asia and Europe were licensed by PharmaEngine to Merrimack in September 2014.

Merrimack signed an exclusive license and collaboration agreement with Baxter for MM-398 outside of the US and Taiwan, while PharmeEngine continues to hold commercialisation rights within Taiwan.

Merrimack submitted a new drug application (NDA) for Onivyde to US Food and Drug Administration (FDA) in April 2015.

The FDA approved Onivyde for the treatment of patients with metastatic adenocarcinoma of the pancreas disease that has progressed following gemcitabine-based therapy, in October 2015.

Onivyde is the only combination drug containing fluorouracil and leucovorin that was approved by the FDA for the treatment of patients with metastatic pancreatic cancer.

PharmaEngine filed an NDA for MM-398 with the Taiwan FDA in May 2015 and obtained drug approval for the treatment of metastatic pancreatic cancer in October.

Baxalta’s marketing authorisation application (MAA) for Onivyde for the treatment of metastatic pancreatic cancer was also accepted for review by the European Medicines Agency (EMA) in May 2015.

Pancreatic cancer disease details

Pancreatic cancer is the fourth most leading cause of cancer related deaths in the US. The disease occurs when cells in the pancreas grow uncontrollably from a malignant tumour.

Exocrine tumours, the most common type of pancreatic cancer, account for approximately 95% of cases.

Adenocarcinoma, another leading sub-type of exocrine tumours, can be detected only in the late stage. It spreads to other parts of the body in the late stage, leading to metastatic pancreatic cancer.

An estimated 49,000 new cases of pancreatic cancer are diagnosed in the US alone and 338,000 new cases worldwide every year.

Onivyde’s mechanism of action

Onivyde contains a topoisomerase inhibitor called irinotecan liposome. The drug contains SN-38, an active metabolite of irinotecan that binds reversibly to the topoisomerase 1-DNA complex and prevents re-ligation of the single strand breaks.

The drug is available in 43mg/10ml dose for intravenous administration.

Clinical trials on Onivyde

FDA approval for Onivyde was based on results from a Phase III clinical trial called NAPOLI-1. It was a randomised, open-label clinical study that enrolled 417 patients with metastatic adenocarcinoma of the pancreas, who received prior to the trial gemcitabine-based therapy.

Patients were enrolled from 76 sites across North America, South America, Europe, Asia and Oceania. The study evaluated the Onivyde combination regimen compared to a control arm of 5-FU and leucovorin.

The study achieved the primary endpoint of overall survival. Results of the study demonstrated patients treated with Onivyde in combination with 5-FU and leucovorin arm achieved median overall survival of 6.1 months compared to 4.2 months for patients who received 5-FU and leucovorin alone.

Patients treated with Onivyde combination also showed improvement in progression-free survival of 3.1 months, compared to 1.5 months in patients who received 5-FU and leucovorin alone.

The most common adverse reactions found in Onivyde administered patients during the study were diarrhoea, fatigue or asthenia, vomiting, nausea, decreased appetite, stomatitis and pyrexia.