This diagnostic package, based on immunohistochemistry, involves testing a range of markers on a single tissue sample from the kidney, uterus, or suspected sites. The package primarily includes CD10 assays, along with crucial complementary markers such as PAX8 (for kidney and uterine tumors), Inhibin or SF1 (for gonadal/ovarian tumors), WT1 (for kidney and ovarian tumors), CK7, and the RCC marker (to differentiate renal cell carcinoma). Its aim is to accurately identify and classify the tumor's primary tissue type.