KEYTRUDA gains FDA approval for treatment of recurrent or metastatic cervical cancer

The U.S. Food and Drug Administration (FDA) has approved Merck’s pembrolizumab (KEYTRUDA®), for the treatment of patients with recurrent or metastatic cervical cancer whose disease had worsened on or after chemotherapy and whose tumors express programmed cell death ligand 1 (PD-L1), as determined by an FDA approved test.

The US FDA has approved the Dako PD-L1 IHC 22C3 pharmDx assay for expanded use as a companion diagnostic test for Keytruda for cervical cancer.

The approval comes in way ahead of the previously decided date of June 28. Furthermore, the drug is approved under the FDA’s accelerated approval regulations based on tumor response rate and durability of response.

Continued approval in future will be based upon verification and description of clinical benefit in the ongoing trials ahead.

The accelerated approval was based on results of ongoing KEYNOTE-158, a multi-center, non-randomized, open-label, multi-cohort trial (NCT02628067). The trial enrolled patients with multiple types of advanced solid tumor, who have not responded to usual chemotherapy or are intolerant to it.

Patients with autoimmune diseases or requiring immunosuppression were excluded from the trial.

The patients received KEYTRUDA intravenously at a dose of 200 mg every three weeks until unacceptable toxicity or documented disease progression or for 24 months in patients without disease progression.

Among the 98 patients with advanced cervical cancer, 77 (79%) had tumors that expressed PD-L1 with a Combined Positive Score (CPS) ≥1 and have received at least one line of chemotherapy in the metastatic setting.

The objective response rate in these 77 patients was 14.3 percent, with a complete response in 2 patients (2.6%) and partial response in 9 patients (11.7%).

Ninety-one percent of patients experienced duration of response exceeding 6 months or longer. Eight patients discontinued the drug because of serious side effects like anemia, fistula, hemorrhage, and infection.

The other common side effects of KEYTRUDA are fatigue, musculoskeletal pain, diarrhea, pain and abdominal pain and decreased appetite (21%).

 No responses were observed in patients whose tumors did not have the PD-L1 expression (CPS<1).

KEYTRUDA is a humanized monoclonal antibody that blocks the interaction between PD-1 and its ligands, PD-L1 and PD-L2, thereby activating T lymphocytes which may affect both tumor cells and healthy cells. This increases the ability of the body's immune system to help detect and fight tumor cells.

Dr. Roy Baynes, senior vice president and head of global clinical development, chief medical officer, Merck Research Laboratories said, “KEYTRUDA is now the first anti-PD-1 therapy approved for the treatment of advanced cervical cancer, providing an important new second-line option for certain patients with this disease. This approval also marks the first indication for KEYTRUDA in gynecologic cancer and reflects our ongoing commitment to bring forward innovative treatment options across a broad range of cancers, including cancers that disproportionately affect women,” in a news release.

KEYTRUDA has already been approved by FDA for treatment of melanoma, head and neck cancer, lung cancer, urothelial cancer, and gastric cancer.

Merck News Release 

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FDA approves first cancer treatment drug based on tumor biomarker, instead of tumor origin.

courtesy: Merck 

In an important announcement, The U.S. Food and Drug Administration (FDA) granted accelerated approval to Merck’s Keytruda (pembrolizumab) for treatment in patients whose cancers have a specific genetic feature (biomarker).

This is the first time the agency has approved a cancer treatment based on a common biomarker rather than the location in the body where the tumor originated.

Keytruda (pembrolizumab) is indicated for the treatment of adult and pediatric patients who have unresectable or metastatic solid tumors that have been identified as having a biomarker referred to as microsatellite instability-high (MSI-H) or mismatch repair deficient (dMMR).

Tumors with these biomarkers are most commonly found in colorectal, endometrial and gastrointestinal cancers, but also less commonly appear in cancers arising in the breast, prostate, bladder, thyroid gland and other places.

“This is an important first for the cancer community,” said Richard Pazdur, M.D., acting director of the Office of Hematology and Oncology Products in the FDA’s Center for Drug Evaluation and Research and director of the FDA’s Oncology Center of Excellence. “Until now, the FDA has approved cancer treatments based on where in the body the cancer started—for example, lung or breast cancers. We have now approved a drug based on a tumor’s biomarker without regard to the tumor’s original location.”

Keytruda works by blocking the cellular pathway known as PD-1/PD-L1 (proteins found on the body’s immune cells and some cancer cells). Keytruda is currently used in patients with metastatic melanoma, metastatic non-small cell lung cancer, recurrent or metastatic head and neck cancer, refractory classical Hodgkin lymphoma, and urothelial carcinoma.

The FDA approval comes in wake of results of 5 clinical trial involving 149 patients with 15 different cancer types. The common cancers were endometrial, gastrointestinal and colorectal.

Nearly 40% of patients in this trial responded well to the treatment with 78% of those were symptom free for more than 6 months.

Common side effects of Keytruda include fatigue, itchy skin (pruritus), diarrhea, decreased appetite, rash, fever (pyrexia), cough, difficulty breathing (dyspnea), musculoskeletal pain, constipation and nausea.

 Keytruda can cause serious conditions known as immune-mediated side effects, including inflammation of healthy organs such as the lungs (pneumonitis), colon (colitis), liver (hepatitis), endocrine glands (endocrinopathies) and kidneys (nephritis).

The FDA press release can be accessed here.