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Combination of drugs produces dramatic tumor responses in advanced melanoma patients
Date:6/2/2013

CHICAGO, JUNE 2, 2013 The combination of the immunotherapy drug ipilimumab and the investigational antibody drug nivolumab led to long-lasting tumor shrinkage in more than half of patients with metastatic melanoma, according to results from a Phase I trial simultaneously published online on Sunday, June 2, in The New England Journal of Medicine and presented by Memorial Sloan-Kettering Cancer Center researchers at the 49th Annual Meeting of the American Society of Clinical Oncology (ASCO).

Several patients experienced tumor shrinkage of more than 80 percent within 12 weeks of receiving the drugs, and the shrinkage was long lasting. Further, 40 percent of patients who received varying concurrent dosages had an objective response meaning at least a 50 percent reduction in tumor size. Side effects from the drug combination were manageable and often reversible.

"We are very excited about the response rates these patients have experienced. This kind of deep and rapid tumor regression has never been seen in melanoma using immunotherapy, and suggests that these two drugs could be better used in combination than alone," said Jedd D. Wolchok, MD, PhD. Dr. Wolchok, a medical oncologist at the Ludwig Center for Cancer Immunotherapy at Memorial Sloan-Kettering, is lead author on The New England Journal of Medicine paper and also presented the findings at ASCO.

Dr. Wolchok and his team combined ipilimumab and nivolumab because promising results in preclinical testing suggested the drugs impact the immune system in a complementary way. By blocking the inhibitory marker CTLA-4, ipilimumab, which the FDA approved for advanced melanoma in 2011, activates the immune system, prompting T cells to start attacking the tumor. Blocking PD-1 further activates T cells in a different manner, allowing them to continue the attack.

"Previous studies had shown that ipilimumab alone could prolong overall survival in advanced melanoma patie
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Contact: Caitlin Hool
hoolc@mskcc.org
646-227-3956
Memorial Sloan-Kettering Cancer Center
Source:Eurekalert

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