Small molecule compounds targeting MAPK‐3, PAK‐1 and AR in breast cancer cells. (a) lansoprazole, flubendazole, miconazole, bicalutamide, carvedilol, baclofen and rizatriptan target MAPK‐3. (b) ketorolac, aminohippuric, fenbufen and probenecid target AR; (c) carvedilol targets PAK‐1.