Over 30-fold increase in Folr1 (NM_008034) expression compared to the control was detected in acinar-type mammary tumors (108.7±23.3 vs 3.1±1.1, p = 0.0051) confirming the microarray results, but non-acinar type, including those tumors composed primarily of basosquamous, pilar, and undifferentiated structures, and ApcΔ580/+ mammary tumors showed no such differences (Figure 4I). The gene discussed is FOLR1; the disease is breast cancer.