Approximately 6 to 23% of the patients with transitional cell carcinoma confined to the superficial mucosa of the bladder suffer for a pT1G3 tumor. Between 1984 and 1994, 12 patients were treated for high grade stage T1 tumores. Trans-urethral resection of the bladder cancer was performed in 8 patients, supported in two cases by immunotherapy with B.C.G. and in one case by endovesical chemotherapy. Radical cystectomy was carried out in 4 patients. Our results are similar to what reported by other Authors, but we didn't have any progression in all 8 patients treated with conservative therapy.