Primary Clonal Loss of Mismatch Repair Protein on Immunohistochemistry: A Pattern of Abnormality That Warrants Genetic Workup. (14th June 2022) - Orr, Christine; Wang, Chiyun; Firat, Canan; Connell, Louise C.; Sheehan, Margaret R.; Vakiani, Efsevia; Stadler, Zsofia K.; Shia, Jinru