“…Since then, several studies have shown that Napsin A can also be expressed in other tumor types [7,11,12]. For example, immunohistochemical Napsin A positivity was found in 0%-52% of clear cell renal cell carcinomas [6,[13][14][15][16][17][18][19][20][21][22], 72%-97% of papillary renal cell carcinomas [6,13,14,[16][17][18][20][21][22], 0%-48% of thyroid tumors [10,11,16,18,19,23,24], 69%-100% of clear cell carcinomas of the ovary [7,19,[25][26][27][28][29][30][31][32] and 0%-9% of cholangiocarcinomas [12,19,33,34]. Partially conflicting results with respect to positivity rates between these studies may be due to the use of different antibodies, the use of different immunostaining protocols as well as different criteria to determine positivity in these studies.…”