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• W2767732875 abstract "Thymectomy via median sternotomy has been the standard surgical approach for patients with thymic malignancies. However, the last decade has seen an increasing interest in minimally invasive thymectomy for early stage tumors. By avoiding sternal split, video-assisted thoracoscopic surgery (VATS) has been reported to be associated with similar operating time but less blood loss during operation, shorter length of intensive care unit and hospital stays, diminished postoperative pain, and improved postoperative pulmonary function. A recent propensity-score matched study by the Chinese Alliance of Research for Thymomas (ChART) reported 100% complete resection rate in both VATS and open thymectomies for UICC stage I (T1N0M0). Both overall and disease-free survivals, as well as cumulative incidence of recurrence were similar between the matched groups. The role of minimally invasive surgery has thus been well established in early stage thymic tumors. Using the International Thymic Malignancy Interest Group (ITMIG) global database, a recent propensity-score matched study found that complete resection rate was comparable between minimally invasive and open approaches (96% vs. 96%, P=0.7), including 33 and 10 patients with Masaoka stage III and IV diseases. And surgical approach was not a predictor of R0 resection in that study. The results suggested that minimally invasive surgery may also have a role in some patients with locally invasive tumors. To prove this, it is necessary to show that VATS is associated with improved peri-operative results, while maintaining similar resection rate and oncologic outcomes as open surgery. We therefore carried out a propensity-score matched study comparing the results of VATS and median sternotmy in UICC T2-3 thymic tumors to see whether minimally invasive surgery might be an acceptable approach. Surgical patients with UICC stage pT2-3 thymic tumors were retrospectively retrieved from a prospectively maintained database at the Shanghai Chest Hospital. Those who undergone VATS resection were compared with patients receiving median sternotomy (Open). A propensity-score matched study was then carried out to compare resection rate, peri-operative outcomes, and follow-up results between the two matched groups. During 2007-2017, 115 patients who undergone surgical resection of thymic malignancies turned out to have UICC pT2-3 tumors upon histological examination. In 29 patients, video-assisted thoracoscopic surgery (VATS) was attempted and completed in 26 cases. In 89 patients (including the 3 conversion cases due to extensive tumor invasion) the lesion was resected via Open median sternotomy. Comparing with the VATS group, the Open group has larger tumor size, higher T stage, and received more induction therapies. A propensity-score match was carried out according to concomitant autoimmune disease, co-morbidity, induction therapy, tumor size, and UICC pTNM stage in 1:2 ratio. This leaves 26 patients in the VATS group and 52 patients in the Open group (Table 1). Induction therapies were given in 7.7% and 9.6% patients in the two groups (p=0.779). The two groups were comparable in patients’ age, gender, tumor histology, as well as all the matching factors. Complete resection (R0) rate was comparable (76.9% in both groups), with higher primary tumor resection rate in the VATS group (96.2% vs. 86.7%, p=0.151). Because of local tumor invasion, pericardium, lung (wedge resection), phrenic nerve, and left innominate vein were resected together with the tumor in 21, 17, 3, and 3 patients, respectively. Postoperative morbidity rate was also similar between the two groups (15.4% vs. 17.3%, p=0.830). Comparing to the Open group, VATS patients had less intraopertaive blood loss (127 ml vs. 219 ml, p=0.005), shorter duration of chest drainage (3±1.2 day vs. 5±4.7 day, p=o.oo5) and length of hospital stay (5.9±3.1 vs. 9.6±5.1, p<0.001). During a median follow-up of 35 months, overall survival was 100% in the VATS group and 95.2% in the Open group (Fig 1, p=0.664), and 3-year recurrence rates were 0.052 and 0.167, respectively (Fig 2, p=0.554). In addition to UICC stage I thymic malignancy, VATS may also be an acceptable approach for locally advanced thymic tumors. Complete resection rate and follow-up results are comparable to open surgery in well selected cases. And better peri-operative results can be expected via VATS approach as compared to median sternotomy. Based on these results, VATS should be attempted in those patients with potentially resectable thymic tumors. And long-term follow-up is still necessary to confirm its oncological effectiveness." @default.
• W2767732875 created "2017-11-17" @default.
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• W2767732875 date "2017-11-01" @default.
• W2767732875 modified "2023-09-30" @default.
• W2767732875 title "MS 06.02 Is There a Role for Minimally Invasive Surgery in Locally Advanced Thymic Tumors?" @default.
• W2767732875 doi "https://doi.org/10.1016/j.jtho.2017.09.217" @default.
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