Then, we performed the PAM50 model to classify the CSF‐CTCs of BC‐LM‐F into five molecular subtypes, most CSF‐CTCs are LumA subtype (Table S4; LumA, 3313 cells, LumB, 46, HER2, 30, Basal, 11, Normal, 5). Here, TMEM43 is linked to breast cancer.