Despite practice changes in treatments, such as the introduction of tyrosine-kinase inhibitors for BCR::ABL1+ in chronic myeloid leukemia (CML), or Bruton tyrosine kinase (BTK) and BCL2 inhibitors for chronic lymphocytic leukemia (CLL), these longitudinal sample collections remain highly relevant for translational immunologic research.76 Here, BCR is linked to chronic myelogenous leukemia, BCR-ABL1 positive.