We previously reported that AR phosphorylation at serine 213 was associated with poor outcome and may contribute to prostate cancer development and progression. This study investigates if specific AR phosphorylation sites have differing roles in the progression of hormone na#x000EF;ve prostate cancer (HNPC) to castrate resistant disease (CRPC). A panel of phosphospecific antibodies were employed to study AR phosphorylation in 84 matched HNPC and CRPC tumours. Immunohistochemistry measured Androgen receptor expression phosphorylated at serine residues 94 (pAR 94 ), 308 (pAR 308 ), 650(pAR 650 ) and 791 (pAR 791 ). No correlations with clinical parameters were observed for pAR 94 or pAR 650 in HNPC or CRPC tumours. In contrast to our previous observation with serine 213, high pAR 308 is significantly associated with a longer time to disease specific death (p #x0003D; 0.011) and high pAR 791 expression significantly associated with a longer time to disease recurrence (p #x0003D; 0.018) in HNPC tumours and longer time to death from disease recurrence (p #x0003D; 0.040) in CRPC tumours. This observation in CRPC tumours was attenuated in high apoptotic tumours (p #x0003D; 0.022) and low proliferating tumours (p #x0003D; 0.004). These results demonstrate that understanding the differing roles of AR phosphorylation is necessary before this can be exploited as a target for castrate resistant prostate cancer.
展开▼
