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Objective: To examine the incidence of recurrence and progression in patients with stage T1, grade-3 carcinoma of the bladder treated with endovesical bacillus Calmette-Guérin (BCG) after complete transurethral resection., Material and Methods: From May 1995 to June 2002, 937 patients with superficial bladder cancer underwent transurethral resection. 46 patients (4.9%) had T1G3 tumors. All patients received endovesical BCG therapy 2-3 weeks after transurethral resection, given in 6 sessions as weekly instillations of 120 ml Pasteur strain BCG in 50 ml saline. Success was defined by normal cytology and cystoscopy, and normal bladder biopsies. Recurrent tumors were resected and a second or third cycle of therapy was given according to pathological status. Progressive tumors were managed by radical cystectomy, radiotherapy and/or chemotherapy depending on the nature of the tumor or clinical status of the patient., Results: During follow-up 60.7% of the patients (28 of 46) remained tumor free after only 1 BCG cycle and 73.9% (34 of 46) after the third BCG cycle, and the bladder was preserved in all. Muscle-invasive progression was noted in 10 (21.7%) patients at the end of the BCG cycles. Radical cystectomy was done in 10 patients. The tumor-free survival rate of all patients including those who underwent cystectomy is 84.8% (39 of 46) with a median follow-up of 61 (range 39-118) months., Conclusion: Adjuvant immunotherapy with BCG after complete transurethral resection of the bladder tumor represents a highly effective treatment for bladder preservation in stage pT1, grade-3 carcinoma of the bladder. pT1G3 tumors with early high-grade recurrence after failed immunotherapy should be regarded as candidates for early radical cystectomy., (Copyright (c) 2005 S. Karger AG, Basel.)