Triglycerides dominated the spectra acquired from normal tissue, but were mostly absent from tumour tissue spectra. Tumour spectra had a relatively high abundance of phospholipidsCosine similarities between cancerous tissue tested was lower than normal adipose tissue, especially in coagulate modeCertain triglycerides are distinctly elevated in coagulate modeMetabolism of linoleic acid was enhanced in triple-negative breast cancer compared with ER/PR-positive cancer. The gene discussed is PGR; the disease is neoplasm.