In the second scRNA‐seq dataset (n = 6 patients with TNBC),10 high SPARC and POSTN mRNA levels were detected in three distinct CAF subtypes, in endothelial cells, M2‐polarized macrophages and cancer cells (where expression varied in function of the patient) (Figure S7), consistent with our TMA data (Table 1). Here, SPARC is linked to cancer.