Interestingly, the “stress response” signatures were significantly enriched in tumours with low‐H2AX protein levels both in TN and HER2 subtypes (TN tumours: Fold enrichment = 2.1; P = 3 × 10−7 by Welch's t‐test; Appendix Table S2, for gene list. Here, H2AX is linked to neoplasm.