Patient, tumour and treatment factors affect complication rates in soft tissue sarcoma flap reconstruction in a synergistic manner

Abstract Introduction Flap reconstruction plays an essential role in the management of soft tissue sarcoma, facilitating wide resection while maximizing preservation of function. The addition of reconstruction increases the complexity of the surgery and identification of patients who are at high risk for post-operative complications is an important part of the preoperative assessment. This study examines predictors of complications in these patients. Methods 294 patients undergoing flap reconstruction following sarcoma resection were evaluated. Data on patient, tumour and treatment variables as well as post-operative complications were collected. Bivariate and multivariate regression analysis was performed to identify independent predictors of complications. Analysis of synergistic interaction between key patient and tumour risk factors was subsequently performed. Results A history of cerebrovascular events or cardiac disease were found to be the strongest independent predictors of post-operative complications (OR 14.84, p=0.003 and OR 5.71, p=0.001 respectively). Further strong independent tumour and treatment-related predictors were high grade tumours (OR 1.91, p=0.038) and the need for additional reconstructive procedures (OR 2.78, p=0.001). Obesity had significant synergistic interaction with tumour resection diameter (RERI 1.1, SI 1.99, p=0.02) and high tumour grade (RERI 0.86, SI 1.5, p=0.01). Comorbidities showed significant synergistic interaction with large tumour resections (RERI 0.91, SI 1.83, p=0.02). Conclusion Patient, tumour and treatment–related variables contribute to complications following flap reconstruction of sarcoma defects. This study highlights the importance of considering the combined effect of multiple risk factors when evaluating and counselling patients as significant synergistic interaction between variables can further increase the risk of complications.