Purpose: This study aimed to explore the clinical implications and prognostic value of the number of organ/structure invasions (NOI) in patients with thymoma after curative surgical resection.
Methods: We retrospectively analyzed 306 consecutive Japanese patients with thymoma who underwent curative surgical resection. Tumor invasions of pericardium, mediastinal pleura, phrenic nerve, lung, and venous structures were examined histopathologically. Cases were classified into four subgroups according to NOI: group 0, no tumor invasion; group 1, tumor invasion into single organ/structure; group 2, tumor invasion of two organs/structures; group 3, invasion of three or more organs/structures. Associations with NOI and several clinical characteristics and their prognostic significance were analyzed.
Results: Pleural invasion was found in 100 cases (32.7%), lung invasion in 48 cases (15.7%), pericardial invasion in 46 cases (15%), phrenic nerve invasion in 29 (9.5%), and venous invasion in 22 cases (7.2%). NOI was classed as group 0 in 201 cases (65.0%), group 1 in 42 cases (13.7%), group 2 in 20 cases (6.5%), and group 3 in 43 cases (14.1%). Cases with higher NOI showed significantly worse relapse-free survival (RFS) and overall survival (OS). Cox's proportional hazard model analysis also identified NOI as a prognostic factor affecting RFS and OS.
Conclusions: Cases with higher NOI of thymoma after radical surgical resection showed significantly worse recurrence rates and survival.
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