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Merck Falls as FDA Puts Hold on 3 Keytruda Myeloma Studies

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Merck & Co., Inc. (MRK - Free Report) shares were down more than 1% in after-hours trading on Wednesday after the company announced that the FDA has placed a clinical hold on three combination studies of Keytruda in multiple myeloma, a form of blood cancer.

While the KEYNOTE-183 and KEYNOTE-185 phase III studies have been placed on full clinical hold, cohort 1 of KEYNOTE-023 phase I study has been placed on partial clinical hold.

Shares of Merck have underperformed the Zacks Classified Large Cap Pharma industry so far this year. The company has gained 9% while the industry rose 12.1% in the period.

We remind investors that last month, Merck was recommended by an external Data Monitoring Committee to stop new enrolment in the KEYNOTE-183 and KEYNOTE-185 phase III studies to allow investigation of death of patients taking Keytruda. However, Merck had then said that patients enrolled in the two studies would continue to receive the treatment.

While the KEYNOTE-183 study was evaluating a combination of Keytruda, Celgene Corporation’s (CELG - Free Report) Pomylast and dexamethasone, KEYNOTE-185 was studying a combination of Keytruda, Celgene’s Revlimid and dexamethasone

With KEYNOTE-183 and KEYNOTE-185 now under full clinical hold, all patients enrolled in the two studies will discontinue treatment with Keytruda.

The latest decision by the FDA was taken based on data currently available from the studies, which showed that the risks of the combination therapy outweigh any potential benefit for patients with multiple myeloma.

KEYNOTE-023 is evaluating Keytruda in combination with backbone treatments in multiple myeloma patients. Cohort-1 of the study was evaluating a combination of the drug with Revlimid and dexamethasone in patients who have received anti-multiple myeloma treatment with an immunomodulatory drug. Patients enrolled in this cohort will also discontinue treatment. The other cohorts of the study will continue.

Keytruda is presently marketed for the treatment of first-line as well as second-line non-small cell lung cancer (NSCLC), advanced melanoma and previously treated recurrent or metastatic head and neck cancer (HNSCC).

Keytruda registered sales of $1.4 billion in 2016. It is expected to grow with a series of regulatory approvals for label expansion received this year, the most important being for classical Hodgkin lymphoma, the first label expansion in a type of haematological cancer, and in combination with Eli Lilly and Company’s (LLY - Free Report) Alimta for first-line lung cancer

The latest clinical hold is a setback for Keytruda, which has otherwise been on a roll this year and is touted as a significant top-line driver for Merck.

Meanwhile, Keytruda is also being studied for more than 30 types of cancer in 500 trials. Almost 50% of these trials are in combination with other cancer drugs. Merck is collaborating with several companies including Amgen, Inc. (AMGN - Free Report) , Incyte, Glaxo and Pfizer separately for the evaluation of Keytruda in combination with other regimens.

Zacks Rank

Merck currently carries a Zacks Rank #2 (Buy). You can see the complete list of today’s Zacks #1 Rank (Strong Buy) stocks here.

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