BCR and primary myelofibrosis: In multivariable Cox models adjusting for age, baseline bone marrow fibrosis, spleen size, TKI switching and ELTS risk, 3-month BCR::ABL1 ≤ 10% was associated a tendency to achieve more MMR and DMR compared with >10%, although these associations did not reach conventional statistical significance (MMR: HR, 2.55; 95% CI, 0.91–7.19; p = 0.076; DMR: HR, 5.78; 95% CI, 0.96–34.68; p = 0.055).