“…Simultaneous determinations of blood group antigens fail to demonstrate a clear correlation between the antigenic status of the tumor and that of random biopsies. These results may help to clarify the indi cations of random mucosal biopsies which should be reserved to the treatment and surveillance of grade 3-tumors, irrespective of their stage.on the progression and recurrence of the bladder tumor is well accepted [1,11,12,23,24,25,27,34,35] and partially explained by cyto fluorometric [6,7] as well as blood surface antigen studies [3,10,12,30,31], There fore, it appears that random mucosal biopsies (RMB) play a definite role in the evaluation and follow-up of bladder tumors. However, routine RMB undoubtedly majors the invasiveness, cost and risks of endoscopic procedures.…”