ETP-ALL immunophenotype was associated with high levels of BAALC (P = 0.003), MEF2C (P = 0.003), LYL1 (P = 0.01), LYN (P = 0.01), XIST (P = 0.02), and lower levels of ST20 (P = 0.007) and EML4 (P = 0.03). The gene discussed is XIST; the disease is acute lymphoblastic leukemia.