Macrophages signature genes CH25H, LYVE1, FSCN1, FOLR2, PLTP, SLC2A5 and FCGBP, and monocytes signature genes RETN, ASGR1 and FCN1 were conformed in the BC‐LM‐F CSF sample (Figure S9, Table S2). The gene discussed is RETN; the disease is breast cancer.