The derived age- and gene-specific subtype proportions for PV carriers by ethnicity are shown in Supplementary Tables S4–S6 and Supplementary Figs. S5–S7; differences between ethnicities were particularly marked for BRCA1, BRCA2, PALB2, BARD1, RAD51C, and RAD51D carriers. Here, BRCA1 is linked to acquired polycythemia vera.