Surgical outcomes of diaphragmatic resection during cytoreductive surgery for advanced gynecological ovarian neoplasia: A randomized single center clinical trial - DRAGON

Introduction: Ovarian cancer (OC) represent nearly 4% of gynecologic malignancies and it is often diagnosed at advanced stage. Diaphragmatic surgery, a fundamental step of advanced stage ovarian cancer (ASOC) debulking surgery, is associated with a high post-operative complication incidence, which is supposedly reduced with thoracostomy tube placement. We assessed the role of intra-operative thoracostomy tube placement, as a prevention measure for post-operative complications, after diaphragmatic resection. Methods: This was a single center prospective randomized trial. Ovarian cancer patients, who underwent mono-lateral diaphragmatic resection, were randomized 1:1 into two arms. Arm A included patients receiving intra-operative thoracostomy tube placement (TP); Arm B patients did not receive thoracostomy tube placement (NTP). After surgery, all patients underwent seriate chest x-ray and ultrasound to record thoracic complications. Statistical analysis included uni- and multivariable logistic regression model (proportional odds model). Results: Three hundred seventy-one patients were screened and 88 patients were enrolled: 44 in arm A and B, respectively. No statistically significant differences for intra-operative (p = 0.291) and any grade of post-operative complication (p = 0.072) were detected, while 6.8% of patients in arm A and 22.7% in arm B experienced severe respiratory symptoms (p = 0.035); 18.2% of patients in arm A had a moderate/large pleural effusion versus 65.9% in arm B (p < 0.0001). At multivariable analysis, results confirmed that the NTP-group had a higher risk to receive post-operative thoracostomy tube placement due to pleural effusion than the TP-group (odds ratio [95% Confidence Interval] = 14.5 [3.7-57.4]). Conclusions: Thoracostomy intra-operative tube placement after diaphragmatic resection is effective to prevent post-operative thoracic complications. The extension of resection does not influence outcomes and the risk of post-operative thoracentesis or TP remain elevated.