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Tumor volume of TETs based on the Masaoka staging system. (A) There was a significant difference only between stages I and IVb (P=0.002), Tumor volume of non-invasive TETs (stage I) and invasive ones (stages II–IVb). (B) There were significant differences between the two groups (P=0.0013). White circles reveal distribution of each case. TETs, thymic epithelial tumors.
