Though no previous studies examined these correlations in cancer-free women, in an earlier study using breast tumor TMAs from Mayo Clinic, we also found strong correlation across available cores (2–3 for a woman) for all three markers (ICC = 0.82, 0.78, and 0.58 for CD44, CD24, and ALDH1A1, respectively), though the findings were not examined separately by the tissue type and the expression assessment was based on pathologist assessment only (29). Here, CD44 is linked to cancer.