The rs2032582 (ABCB1) variant, with a frequency of 0.012 in the IND-NLLA population and 0.75 in the IND-LLA population, in homozygosity, is associated with decreased overall survival in multiple myeloma patients treated with dexamethasone, according to clinical data available on the PharmGKB platform (https://www.pharmgkb.org). This evidence concerns the gene ABCB1 and AL amyloidosis.