BHLHE40 and cancer: Among these, SREBF1 attracted our interest (Figure 3A and Figure S5F, Supporting Information) because it regulates the key factors involved in fatty acid synthesis and is overexpressed in several cancer types.[10] The results of BHLHE40 ChIP‐seq (Figure 3D) and luciferase reporter assays (Figure 3E) demonstrated that BHLHE40 binds to the promoter regions of SREBF1.