after an experimental period of 21 months the incidence of bbn-induced tumors in the urinary bladder ( number of rats with a bladder tumor ) had not increased following additional administration of phenacetin alone ( 47 % ) or in combination with caffeine ( 48 % ) compared with the control group , the animals of which received exclusively bbn ( 44 % ) .
C0005682
urinary bladder
C0005695
bladder tumor