For patients with types A and B1/B2 thymoma (n = 9), seven gene mutations, including MTOR, BRCA1, APC, NF1, HRAS, NTRK3, and PTCH1, were detected, and each gene appeared only once in patients with non-TCs+type B3 TETs (Figure 2C). The gene discussed is PTCH1; the disease is thymoma.