Indeed, when we compared 14 cases of DCIS (preinvasive lesions) from women who had a pregnancy 6 — 25 years prior to diagnosis with 13 cases from age -
matched nulliparous women in a tissue bank from the University of Colorado (Figure 7 — source data 1A), we detected significantly more pSTAT5 + lesions in the parous cases than in the nulliparous cases (p = 0.01; Figure 7A, B).