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The Fiscal TimesRPT - INSIGHT-Pfizer, Bristol revive cancer drugs that rev up immune systemReuters(Repeats for additional subscribers). By Bill Berkrot. NEW YORK Aug 7 (Reuters) - Some of the most heralded new cancer drugs fight the disease by removing brakes on the immune system. Now a few leading drugmakers are paying attention to a second, ...Pfizer, Bristol revive cancer drugs that rev up immune systemReuters UKCancer Immunotherapy - Pfizer Inc., Bristol-Myers Squibb Co Research New ApproachBidness ETCall 12 news articles »