PPBP and thymoma: This was observed for CXCL1 and CXCL6 in breast invasive carcinoma, PPBP in kidney chromophobe, CXCL3 in kidney renal papillary cell carcinoma, CXCL6 in pancreatic adenocarcinoma, CXCL6 in thyroid carcinoma, and CXCL3 in thymoma.