For the breast cancer lines MCF-7 (hormone receptor positive), MDA-MB-453 (HER2 positive), SUM-190 (inflammatory breast cancer, HER2-positive) and MDA-MB-231 (partial mesenchymal, triple-negative breast cancer), as the number of spiked cells into HDB increased, the number of gene transcripts detected also increased (S1 Fig in S1 File). Here, ERBB2 is linked to inflammatory breast carcinoma.