PTX3 and hereditary clear cell renal cell carcinoma: The human protein atlas (41, 42) reports no baseline expression of PTX3 mRNA in four human renal epithelial cell lines (HEK293, NTERA-2, PC-3, RPTEC-TERT1, data available at https://www.proteinatlas.org/ENSG00000163661-PTX3/cell), no epithelial PTX3 positivity using immunohistochemistry in healthy kidney samples from three different donors (data available at https://www.proteinatlas.org/ENSG00000163661-PTX3/tissue/kidney#imid_18912581) and reports negative staining results in 12 renal cell carcinoma samples (data available at https://www.proteinatlas.org/ENSG00000163661-PTX3/ pathology).