s. NEW YORK-(BUSINESS WIRE)- The German Breast Group (GBG) is the largest worldwide with, over 00,000 patients recruited in their trials. NEW YORK-(BUSINESS WIRE)- The German Breast Group (GBG) is the largest worldwide with, over 00,000 patients recruited in their trials. Advise females of reproductive potential to use effective contraception during IBRANCE treatment and for 0 