In addition to missense mutations reported by Song et al. (5% of 55 MF; 3% of 31 SS), amplifications in STAT5B were noted, for instance, by Choi et al. (62.5% of 40 CTCL) and Iyer et al. (18% of 49 MF samples) (93, 98, 100, 104). The gene discussed is STAT5B; the disease is mycosis fungoides.