Elective nodal irradiation for prostate cancer patients: Comparison of available dynamic techniques.

96 Background: The few recent studies showed that regional lymph node metastases of prostate cancer (PCa) could be successfully treated. It means that role of pelvic nodes (PN) irradiation could increase in next period. A problem is rectal and bladder toxicities of this treatment. Intensity modulated dynamic irradiation techniques (DT) may potentially help to reduce treatment related side effects. The aim of study is to compare three different radiotherapy techniques: conformal (CRT), static field intensity modulated (SF IMRT) and rapid arc (RA) for elective pelvic lymph nodes irradiation. Methods: We analyzed CRT, IMRT and RA plans of irradiation PN for ten patients. PTVs included PN iliac, iliac external upper then acetabulum, iliac internal and obturatory. Prescribed doses were 44 Gy/22 fractions. We compared the doses delivered to PTV rectum and bladder using dose volume histograms. The U Mann-Whitney, W Shapiro-Wilk and ANOVA rang Kruskal-Wallis tests were used for statistical analysis. Results: The ...