2577 The correlation between circulating cell-free AR and CYP17A1 copy number variations and tumor burden estimated by 18F-fluorocholine PET/CT in metastatic castration-resistant prostate cancer patients treated with abiraterone. (September 2015) - Conteduca, V.; Salvi, S.; Caroli, P.; Scarpi, E.; Lolli, C.; Burgio, S.L.; Menna, C.; Schepisi, G.; Bianchi, E.; Gurioli, G.; Paganelli, G.; Casadio, V.; et al.