Vermeidung des Lokalrezidivs durch eine adjuvante Strahlentherapie nach radikaler Prostatektomie

Depending on the tumor stage, 15-60% of patients develop a rise in PSA from levels around zero following radical prostatectomy. It is unclear whether this involves a local, systemic, or a mixed form of local/systemic progression. In addition to a multitude of retrospective studies, the results of three randomized trials are available that have already been published in full or in abstract form.For pT3 prostate cancer with extraprostatic extension, data are available from three randomized trials that consistently evidence an absolute decrease in biochemical progression rate of 20% after 4-5 years. These findings confirm the results of numerous retrospective studies. The large majority of authors employ total radiation doses of 60 Gy with single doses of 2 Gy. One randomized trial has shown that an increased local control rate is the basis for prolonged biochemical progression-free survival. The rate of acute and late radiation sequelae after three-dimensionally planned prostatic fossa radiotherapy (RT) with 60 Gy is very low; the rate of more severe late sequelae is <2%. Data on the status of pT2 prostate cancer with positive surgical margins are worse. The current findings are controversial and require further investigations. Basically, however, adjuvant RT is also possible for pT2 cancers with positive surgical margins. The efficacy of adjuvant RT for patients with positive surgical margins of pT3 carcinomas, whether or not they achieve PSA levels around zero, has been substantiated. A prolongation of survival time has, however, not yet been established because the follow-up period is too short. Randomized trials are still needed for cases of organ-confined prostate cancer (pT2 R1). It is unclear whether adjuvant RT is superior to RT when PSA levels increase beyond zero after radical prostatectomy. Randomized trials addressing this issue are still lacking.