KLK3 and prostate cancer: As shown in Figure 2A, RT-PCR analysis showed the expression of human PSA in a sub-cutaneous PCSD1 xenograft tumor (P1) as well as in the human prostate cancer cell line, LAPC4, but not the human chronic myelogenous leukemia (CML) cell line, K562, nor murine bone marrow, spleen or liver [52].