Purpose: The present study aims to evaluate both early and late toxicity profiles of patients receiving immediate postoperative radiotherapy (RT; adjuvant RT or additive RT) compared to salvage RT.
Methods: We evaluated 253 patients with prostate cancer treated with either immediate postoperative (adjuvant RT, n = 42; additive RT, n = 39) or salvage RT (n = 137). Thirty-five patients received salvage treatment but did not achieve a postoperative prostate specific antigen (PSA) level <0.1 ng/ml and thus were excluded from analysis.
Results: A significantly higher rate of early grade 1/2 proctitis in the immediate postoperative RT group without additional pelvic RT was observed (p = 0.02). Patients in the immediate postoperative RT group without additional pelvic RT showed significantly more early urinary tract obstructions (p = 0.003). Toxicity rates of early (<3 months) and late (3-6 months) postoperative RT were similar (p > 0.05). Baseline recovery rate of erectile dysfunction was better in patients with immediate postoperative RT without additional pelvic RT (p = 0.02; hazard ratio (HR) = 2.22, 95%-confidence interval, 95%-CI: 1.12-4.37). Recovery rate of urinary incontinence showed no significant difference in all groups (p > 0.05).
Conclusion: Patients receiving immediate postoperative RT (adjuvant or additive RT) without additional pelvic RT experience early gastrointestinal (GI) side effect proctitis and, as well as early genitourinary (GU) toxicity urinary tract obstruction more frequently than patients treated with salvage RT. Therefore, complete recovery after surgery is essential. However, we suggest basing the treatment decision on the patient's postoperative clinical condition and evaluation of any adverse risk factors, since many studies demonstrate a clear benefit for immediate postoperative RT (adjuvant or additive RT) in terms of oncological outcome.
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