ABCA7 and hepatocellular carcinoma: By determining the DNA methylation status of the CpGs in the ABCA7 promoter–exon 1 region and the intron 1 regions A and B (Figure 1) for 14 breast cell lines (luminal A: CAMA-1, KPL-1, MCF-7, T47D, and ZR-75-1; luminal B: BT-474; Her2-positive: AU-565 and SK-BR3; triple-negative: HCC 1143, HCC 1937, HS 578T, MDA-MB-231, MDA-MB-453; and non-cancerous: MCF 10F), eight CpGs in promoter–exon 1, four CpGs in exon 1, and eight CpGs in intron 1 showed methylation levels <20% (Figure 5a).