Transperineal minimally invasive abdomino-perineal resection: preliminary outcomes and future perspectives

Abdomino-perineal resection (APR) for rectal cancer is challenging, due to the difficult exposure of the surgical field. Many investigations proved worst results in terms of circumferential resection margin (CRM) involvement compared to rectal anterior resection (RAR) with total mesorectal excision (TME). Extralevator abdomino-perineal excision (ELAPE) improved oncologic outcomes, but is burdened by important limitations (positioning, wound closure). Applying the concept of transanal minimally invasive surgery (TAMIS) and the experience in transanal TME (TaTME) to the perineal phase of APR could overcome these limitations. A series of consecutive cases of transperineal minimally invasive APR was matched with an historical series of standard laparoscopic APR. Primary endpoints were global complication rate and CRM involvement, secondary endpoints were operative time, time to flatus and oral feeding and length of hospital stay. Fifteen patients underwent a transperineal minimally invasive APR for cancer, median age was 65 (49-88) years, median distance from the anal verge was 3 (2-5) cm and six patients underwent neoadjuvant chemo-radiotherapy. No intraoperative complications occurred in both groups; need of post-operative blood transfusions was significantly higher in the traditional laparoscopic APR group. No differences were reported in terms of wound dehiscence between the two groups. Positive CRM was reduced in transperineal minimally invasive APR versus standard laparoscopic APR, but the difference was not statistically significant. Transperineal minimally invasive APR appears to be safe and could improve post-operative and oncologic outcomes by means of better vision and reduced surgical trauma.