MKI67 and neoplasm: Conversely, overexpression of PlexinD1 in LNCaP cells led to more tumors formed (Vector: 6 tumors/8 injection sites; PlexinD1: 8 tumors/8 injection sites), faster tumor growth, higher tumor weight, and increased percentages of tumor-expressing Ki-67+ cells in xenografted mice compared with controls (Appendix Figs. S5A–E).