618 Management of Rectal Cancer in England And Wales. Is the Rate of Abdominoperineal Excision of Rectum Associated with The Pre-Operative Radiotherapy Rates?

Aim Rectal cancer treatment has improved over the years, but variations in practice remain. Abdominoperineal resection (APER) is associated with significant morbidity and pre-operative radiotherapy (RT) is only recommended for advanced rectal cancer. As such, APER and RT should be reserved for patients with an appropriate clinical need. The aim of the study is to evaluate the association between the rates of APER and RT, and whether any other factors are associated. Method Data on rectal cancer cases was extracted from National Bowel Cancer Audit 2019. Primary outcomes were: APER rate, RT rate. Pearson’s correlation coefficient was calculated. The means for APER and pre-operative radiotherapy were plotted on a four-quadrant matrix. The differences were analysed using Mann-Whitney U and Student T-test. Results 3,764 patients were included. A mean of 25% (95%CI: 10.3-14.9%) underwent APER and an average of 34% (95%CI: 30.5-36.8%) received RT. There was a weak positive correlation between rates of APER and RT (r = 0.356, p < 0.001). 43 (37%) trusts had proportions of both APER and RT below the overall mean, whilst 30 (26%) had both proportions above. No significant differences were found when comparing other variables between the high to low-rate trusts (p > 0.05). Conclusions There is a weak positive correlation between the proportion of rectal cancer patients undergoing APER and the proportion receiving RT in trusts across England and Wales. It is unknown whether this finding has a clinical significance and further analysis on trust/surgeon performance and patient demographics is needed, allowing for prevention strategies to be implemented.