ALDH1A1 and cancer: 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).