PAX9 and invasive breast carcinoma: Indeed, in BRCA tumors we observed that COL10A1 expression is anticorrelated with the somitic mesoderm marker TCF15 (Spearman’s ρ = −0.16, p = 4.5 × 10–8) and positively correlated with the sclerotome marker PAX9 (Spearman’s ρ = + 0.31, p = 2.0 × 10–26), supporting its contribution to the development of paraxial mesoderm and ossification in cancer.