Pathologists

Since the early 20th century, pathologists have been squinting into microscopes, looking for a handful of features in biopsied tumor samples that enable them to classify how aggressive the cancer is.

After the training phase, "C-Path" (Computational Pathologist) evaluated a second set of pathology slides, which came from a different hospital and which were medically and demographically different from the training group. It actually did better than human pathologists, although Koller stresses that C-Path is not designed to replace doctors looking through microscopes.