Report of the forth Asian Prostate Cancer (A-CaP) study meeting.

The Asian Prostate Cancer (A-CaP) Study is an Asia-wide prospective registry study for surveying the treatment outcome of prostate cancer patients who have received a histopathological diagnosis. The study aims to clarify the clinical situation for prostate cancer in Asia and use the outcomes for the purposes of international comparison. Following the first meeting in Tokyo on December 2015, the second meeting in Seoul, Korea 2016, the third meeting in Chiang Mai, Thailand, on October 2017, the fourth meeting was held in Seoul, again on August 2018 with the participation of members and collaborators from 13 countries and regions.

Advantage of the right lateral position compared with the lithotomy position during the perineal procedure in abdominoperineal resection.

Background/aims: Abdominoperineal resection (APR) is generally performed in the lithotomy position (LT-APR). The aim of this retrospective study was to evaluate the advantage of the right lateral (RL) position during the perineal phase of APR, in extended APR (ext-APR) that needed additional excision of the pelvic organs and sacrococcyx, and in total pelvic exenteration (TPE).

Methods: The present study is based on 50 patients observed from January 1993 to December 2004 (43 with primary rectal malignancy, 7 with recurrent cancer), who had undergone the following surgeries: LT-APR was carried out in 20 patients, RL-APR in 13, LT-ext-APR in 5, RL-ext-APR in 8, LT-TPE in 2 and RL-TPE in 2.