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Background  The aim of this study was to explore the impact of including or excluding the ischiorectal fossa (IRF) within the clinical target volume during neoadjuvant chemoradiotherapy (NCRT) using intensity modulated radiotherapy, in locally advanced lower rectal cancer (LALRC).    Methods  We retrospectively analysed the data of 220 LALRC patients who received NCRT followed by abdominoperineal resection between January 2009 and January 2015. Six patients were excluded because of loss to follow-up, 90 patients received IRF irradiation (IRF group) while 124 patients did not (NIRF group). Survival, patterns of recurrence, and treatment toxicities were compared between the two groups.    Results  Overall, patient/treatment variables were well balanced except for surgical technique. Perineal wound complications in the IRF and NIRF groups, were 40.0 and 24.2%, respectively ( p  = 0.010); corresponding 3-year perineal recurrence rates, local recurrence free survival, overall survival, and distant relapse free survival were 4.4% vs. 2.4% ( p  = 0.670), 88.1% vs. 95.0% ( p  = 0.079), 82.6% vs. 88.4% ( p  = 0.087), and 61.9% vs. 81.0% ( p  = 0.026), respectively. Multivariate analyses demonstrated the following factors to be significantly related to perineal wound complications: irradiation of the IRF (odds ratio [OR] 2.892,  p  = 0.002), anaemia (OR 3.776,  p  = 0.010), operation duration &gt; 180 min (OR 2.486,  p  = 0.007), and interval between radiotherapy and surgery &gt; 8 weeks (OR 2.400,  p  = 0.010).    Conclusions  Exclusion of the IRF from the clinical target volume during NCRT using intensity-modulated radiotherapy in LALRC could lower the incidence of perineal wound complications after abdominoperineal resection, without compromising oncological outcomes.    Electronic supplementary material  The online version of this article (10.1186/s13014-019-1338-5) contains supplementary material, which is available to authorized users.

radiation oncology

Excluding the ischiorectal fossa irradiation during neoadjuvant chemoradiotherapy with intensity-modulated radiotherapy followed by abdominoperineal resection decreases perineal complications in patients with lower rectal cancer