How do we measure a residual tumor size in histopathology (the gold standard) after neoadjuvant chemotherapy?
Apple SK; Suthar F Department of Pathology Center of Health Science (CHS), David Geffen School of Medicine at University of California at Los Angeles, Mail Code: 173216, 10833 Le Conte Avenue Los Angeles, CA 90095-1732, USA. sapple@mednet.ucla.edu Accurate reporting of the residual tumor size by pathologists after neoadjuvant chemotherapy is an important component of a breast cancer. Recent literature reported comparisons regarding the accuracy of clinical and radiological residual tumor size findings using the histopathology as a “gold standard”. However, the histopathological methods of measuring the residual tumor size are not standardized. Most pathologists use the tumor size measured by the gross examination. We collected 32 patient samples and compared the residual tumor size by gross and microscopic pathologic examinations. Using microscopic tumor size as the gold standard, our study showed gross tumor size is overestimated in 25%, underestimated in 56% and correlated to the fin
