Figure 4. The effect of L/B pathologic classification on overall survival. (A) By log-rank analysis, L/B classification predicts prognosis, with spindle, lymphocytic, and mixed thymomas being associated with fewer overall deaths (p < 0.001). (B) Through selective grouping, the overall differences in survival are emphasized. Indeed, L/B pathologic classification did prove to be an independent predictor of overall survival by Cox regression.