AMACR and clear cell adenocarcinoma: Sun et al. [8] stated that adequate characterization had been hampered by its rarity; alpha-methyl-acyl-CoA-racemase (AMACR)/P504S had been reported to be positive in prostatic adenocarcinoma, papillary renal cell carcinoma, and gastrointestinal neoplasms; nevertheless, it had never been previously studied in clear cell carcinomas of lower urinary tract.