You may use TRAMPC1 in addition to TRAMPC2 cells. TRAMP-C1, TRAMP- C2 and TRAMP-C3 cell lines are derived from a heterogeneous 32-week tumor of the transgenic adenocarcinoma mouse prostate (TRAMP) model. TRAMPC1 and TRAMPC2 are tumorigenic when grafted into syngeneic C57BL/6 hosts. However, TRAMPC3 grows readily in vitro, but does not form tumors.
You may also use RM-1 cell line as the RM-1 syngeneic prostate cancer model in C57BL/6 mice. This cell line is available at ATCC (CRL-3310). RM-1 is a murine prostate cancer cell line derived from a Ras+Myc-induced prostate cancer that developed from a urogenital sinus mouse prostate reconstitution in male C57BL/6 mice. You may want to refer to the link below for more information.