RALGAPB and breast cancer: Unexpectedly, elevated expression of RALGAPB, the non-catalytic subunit of both RALGAP1 and RALGAP2, is associated with poor outcome in the METABRIC cohort (Supplemental Figure S8E) and RALGAPB expression is elevated in both TNBC and other BC subtypes relative to normal breast (Supplemental Figure S8F).