TTR and metastasis: In a prospective cohort study including 132 gastric cancer patients, combined model including FR+ CTC level and other biomarkers (CA19-9, prealbumin and peripheral lymphocyte count) presented high sensitivity (100%) and moderate specificity (59.3%) in predicting peritoneal metastasis, the preoperative FR+ CTC level could also predict short-term recurrence after surgery (38).