PROGNOSTIC-SIGNIFICANCE OF PELVIC RECURRENCE AND DISTANT METASTASIS IN PROSTATE CARCINOMA FOLLOWING DEFINITIVE RADIOTHERAPY

This report is a retrospective analysis of 317 patients with recurrent prostate carcinoma, following definitive radiation therapy to 738 patients with histologically confirmed, clinical Stage T1b-T4(A2-D1) adenocarcinoma of the prostate. Seventy-four patients (10%) experienced pelvic recurrence only; 100 (13%) both pelvic recurrence and distant metastasis, while 143 (20%) developed distant metastasis only. The diagnosis of prostate recurrence was histologically confirmed in 92/174 (53%), while in the others diagnosis was based on clinical and radiographic evidence. Ninety percent of all recurrences occurred within 7 years of initial treatment. The median survival from time of recurrence for all patients was 27 months, with 5-, 8-, and 10-year survival rates of 24%, 12%, and 7%, respectively. In patients who experienced pelvic recurrence only, the 5-, 8-, and 10-year survival rates were 50%, 30%, and 22%, respectively (p < 0.0001). The 5-year survival rate from time of recurrence for patients who experienced pelvic recurrence with initial Stage T1b(A2) and T2(B) disease was 71% as opposed to 39% for patients with initial Stage T3(C) disease. The time of recurrence (i.e., the disease-free interval from initial treatment) significantly affected subsequent survival: the 5-year survival rates from time of recurrence for patients with pelvic recurrence were 20%, 49%, and 94% for those who recurred within 2 years, 2 to 5 years, and more than 5 years, respectively. Two-thirds of the patients with recurrence received hormonal therapy, including bilateral orchiectomy. Salvage therapy with hormones, including bilateral orchiectomy, has a favorable impact on patient survival: The 5-year survival rate from time of pelvic recurrence salvaged with hormones was 70% compared with 21% for patients not receiving hormonal therapy. In conclusion, the prognostic factors that affect subsequent patient survival after pelvic recurrence include initial stage, disease-free interval from initial treatment, and salvage therapy with hormones. Patients with distant metastasis with or without pelvic recurrence showed statistically worse survival and were apparently not influenced by initial tumor stage, or disease-free interval from initial treatment.