Aim of the study: To evaluate the long-term follow-up in patients undergoing external beam radiotherapy for locally advanced prostate cancer.
Patients and methods: From November 1999 to January 2007, 223 patients with a histologic diagnosis (204 transperineal needle biopsies; 19 trans-urethral prostatic resections) of locally advanced prostate cancer underwent external beam radiotherapy; of these patients, 151 were T3a (extracapsular extension) and 72 were T3b (involvement of seminal vesicles); the extracapsular extension was demonstrated using pelvic RMN or transrectal ultrasound, while the presence of distant and lymph node metastases was excluded using TC total body or bone scan. PSA value at diagnosis was 29.1 ng/mL (0.4-379 ng/mL). Radiotherapy was used on prostate and seminal vesicles in 201 patients (141 T3a; 60 T3b) while in 22 patients (10 T3a; 12 T3b) it was extended to the pelvis. Biochemical recurrence was defined using ASTRO definition (three consecutive PSA rises after PSA nadir); no patients underwent control prostate needle biopsy for problems of interpretation related to postactinic tissue changes. All complications were recorded and analyzed using Radiation Morbidity Scoring Criteria (RTOG).
Results: At a mean 55-month follow-up, of the 223 patients treated, 26 have escaped controls, 168 are alive (141 disease-free; 27 with recurrent disease) and 29 died; of this group, 11 patients died from clinical progression, while in the others the cause was not related to the prostatic problem; only one patient died from iatrogenic problems. Hormone treatment was conducted in different ways (neoadjuvant, adjuvant, concurrent to radiotherapy or in association) considering patients' characteristics. Most common complications involved rectum and bladder.
Conclusions: Radiotherapy is a viable and safe method in the treatment of locally advanced prostate cancer; however, it is essential the role of hormone therapy.