ALDH1A1 and neoplasm: When stratified by ethnicity and Gleason score, the ALDH1A1 transcription level in African‐American cases was significantly lower than that in normal tissues (p = 4.14 × 10−5), so was the tumor tissues in Gleason 6 and 7 (p = 4.09 × 10−5 and p = 1.40 × 10−2).