KRT5 and squamous cell carcinoma: However, many tumors other than mesothelioma are also positive for CK5/6, including but not limited to 88% of adenosquamous carcinoma of the pancreas [53], 55% of metastatic squamous carcinoma of various origin [54], 75% of lung squamous cell carcinoma in fine needle aspirate specimens [55], 100% of squamous cell carcinoma in pleural fluids [14], 98% of squamous cell carcinoma and 18% of adenocarcinoma in the lung [56], 62% of urothelial carcinoma [57], and 50% of endometrial adenocarcinoma [57].