PPP1R3B and breast cancer: Interestingly, a higher correlation across basal-like compared to other breast cancers was observed for both PPP1R3B (basal-like: r = 0.29, other: -0.06) and FXYD3 (basal-like: r = 0.52, other: 0.07), significant at p<0.01 for FXYD3, suggesting their cis-regulatory role is restricted to the basal-like subtype.