VPS9D1-AS1 and breast cancer: To determine the sequence and expression of FAISL in breast cancer cells, we performed 5′ and 3′ RACE (Figure S2A, Supporting Information) and verified that FAISL is a 1753 nt transcript with 4 exons and poly‐A tail (Figure S2B, Supporting Information), which was consistent with the sequence in UCSC Genome Browser database.