NFKB1 and cancer: Solid Tumors: Pterostilbene (trans-3,5-dimethoxy-4-hydroxystilbene, a phytochemical component of berries, 2.5–10 μM) was tested in MCF-7 and MDA-MB-231 breast cancer cell lines and found to inhibit the production of cancer stem-like cells (CSCs characterized by CD44+/CD24- expression) through an NFκB pathway [41].