PPBP and cervical squamous cell carcinoma: In another example, cervical squamous cell carcinoma and endocervical adenocarcinoma exhibited a negative correlation between the expression of CXCL1, CXCL6, and CXCL8 and EMT, whereas the expression of CXCL3, CXCL5, and PPBP positively correlated with EMT.