Safety concerns cloud early promise of powerful new cancer drugs

January 26, 2015 6:05 AM

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NEW YORK (Reuters) - A new wave of experimental cancer drugs that directly recruit the immune system's powerful T cells are proving to be immensely effective weapons against tumors, potentially transforming the $100 billion global market for drugs that fight the disease.

But top oncology researchers are concerned about the two emerging technologies, citing dangers seen repeatedly in clinical trials including the potentially fatal buildup of toxic debris from killed tumor cells and damage to healthy tissue. Such side effects could block regulatory approval if they ar...

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