(E) Coefficient of variation (CV) of proteins detected and quantified in UW TNBC study (non-TMT labeled) vs. MGHCC BREAST study (TMT-labeled). Both studies had a maximal overlap of breast cancer cell lines for a robust estimation of CV. Housekeeping genes are highlighted as red dots. Spearman correlation (rcv) was calculated to estimate the agreement in the CV estimates of common set of proteins between the two studies. 