PTPRC and neoplasm: The presence of OvCa+/CD45- CTCs at baseline was associated with significantly lower levels of KRT5 (mean lg2 transformed gene expression 1.12 vs. 0.10, p = 0.040) and KRT7 (mean lg2 transformed gene expression 1.34 vs. 0.36, p = 0.034) gene expression in the corresponding tumor tissue samples.