MUC5B and thymoma: As shown in Figure 3A, the mutation frequencies of CDC27 (67% vs. 29%), CTNND2 (33% vs. 4%), KRTAP6‐1 (33% vs. 4%), and RERE (33% vs. 4%) trended to be higher in type B3 thymoma than other subtypes of thymomas, while the mutation frequency of MUC5B (0% vs. 32%) trended to be lower in type B3 thymoma.