Thus, we focused on PDE7A and measured the PDE7A protein levels in TNBC samples by performing an immunohistochemistry (IHC) using a breast cancer tissue microarray (US Biomax: BC081120f) consisting of 110 cases of invasive carcinoma (including 21 TNBC cases) and 10 samples of adjacent normal breast tissue. The gene discussed is PDE7A; the disease is breast cancer.