Other gain of function mutations seen in CTCL include Nav3 (12q21), JunB (chr19), c-MYC/MAX, p53, PTEN/Fas, p15, p16, NFKB, bcl-2, and Stat2.The mutations in CTCL are still being studies and as of now there are more than 500 chromosomal abnormalities, including TCR signalling and chromatin modification, noted in CTCL. The gene discussed is FAS; the disease is primary cutaneous T-cell non-Hodgkin lymphoma.