FGFR2 and esophageal squamous cell carcinoma: As shown in Fig. 3A, the expression levels of fibroblast and CAF markers were increased, while fibrocyte markers were decreased in the cells isolated from xenografts as compared to parental or Bsd selected fibrocytes, indicating that FGFR2+ fibrocytes can differentiate into CAFs under ESCC-microenvironmental condition.