Molecular or morphology? Challenges in pathologic diagnoses
October 2021—Recent molecular genetic advances have dramatically expanded diagnostic options, thus revolutionizing the diagnosis of many tumor types, especially those of soft tissue and bone. Advances in the discovery of molecular alterations underlying neoplastic pathogenesis have also provided insights into novel therapeutic targets and prognostic biomarkers. These improvements have led to the reclassification of a growing list of previously established tumor types, resulting in significant challenges for practicing pathologists, as exemplified herein.