Prospective Determination Of Long-Term Toxicity And Quality Of Life (Qol) Of Patients With Prostate Cancer After Intensity-Modulated Radiotherapy (Imrt).

151 Background: To determine prospectively long-term toxicity and quality of life (QoL) of prostate cancer patients after intensity-modulated radiotherapy (IMRT).55 patients with localized prostate adenocarcinoma were treated by IMRT (76 Gy) between February and November 2006. Physicians scored acute and late toxicity using the Common Terminology Criteria for Adverse Events version 3.0. Patients assessed general and prostate-specific QoL before IMRT (baseline) and at 2, 18 and 54 months using European Organization for Research and Treatment of Cancer questionnaires QLQ-C30 and QLQ-PR25.Median age was 73 years (range 54-80 years). Risk categories were 18% low risk, 60% intermediate risk, and 32% high risk. The incidence of urinary and bowel toxicity immediately after IMRT (n=55) was, respectively, 36.8% and 23.7% (grade 1), 5.3% and 5.3% (grade 2), 2.6% and none (grade 3). At 18 months (n=55), it was 23.7% and 10.3% (grade 1), 26.3% and 13.2% (grade 2) and none and 2.6% (grade 3). At 54 months (n=38), it was, 34.2 and 23.7% (grade 1), 5.3% and 15.8% (grade 2) and 5.3% and none (grade 3). After 54 months, there was a statistically significant worsening of QoL with regards to 11 items among the 19 studied. However, the scores were clinically relevant (decrease > 10 points) only for physical functioning, role functioning, social functioning, fatigue, pain, dyspnea and constipation. No statistical differences were shown between 54 months and baseline for general health, bowel symptom, treatment related symptoms and sexual activity. Concerning urinary symptoms, there was a statistically significant deterioration but not clinically relevant (difference < 10 points).High-dose IMRT to the prostate with accurate positioning does not induce any clinically relevant deterioration in long-term urinary and gastrointestinal QoL. Deterioration in functioning items may also be related to age and comorbidities. To our knowledge, our study is the only prospective study regarding quality of life following prostate IMRT with a very long follow-up of 54 months.