GSTM1 and myeloproliferative neoplasm: Similar to MDS/MPN-RS-T, age ≥70 years (HR 2.04, 95% CI 1.3–3.3, P = 0.004), Hb ≤10 g/dL (HR 2.2, 95% CI 1.14–4.1, P = 0.02), and abnormal cytogenetics [except -Y, HR 2.4, 95% CI 1.12–5.4, P = 0.02] significantly predicted inferior OS.