Expression of PKA did not remain associated with survival when potentially confounding factors of tumour size, grade, nodal stage, ER status, PR status, HER2 status, and LVI status were included in multivariate Cox regression analysis (P = .201; hazard ratio (HR)=0.768; 95% CI = 0.513‐1.151) (all with individual log‐rank statistics of P < .001). This evidence concerns the gene ERBB2 and neoplasm.