FSCN1 and neoplasm: Additionally, positive correlations were found between the proportion of FSCN1+CD326+ CTCs and tumor size [T(1–4)] (r = 0.8; P = 0.03), as well as between the proportion of FSCN1+ tumor cells and FSCN1+ fibroblasts in tumor tissue (r = 0.9; P = 0.02).