HDAC9 and cancer: However, given the important established roles of CDKs and GSK3 in cancer cells’ growth, future studies will elucidate whether: (i) KP can enhance co-applied cell-ablative strategies, (ii) higher doses of KP might improve analgesia and function antineoplastically, (iii) attractive co-medications with complementary mechanisms-of-action, such as HDAC-inhibitors, can enhance the antineoplastic as well as analgesic potencies of KP.