Interobserver reproducibilty of intraductal carcinoma classification and invazive ductal carcinoma grading systems
Twenty seven intraductal, 52 intraductal+invazive ductal and 1 papillary carcinoma were re-evaluated by 3 observers, independently. Interobserver variation for the intraductal classification and invazive ductal carcinoma grading systems were tested. Interobserver agreement was good for systems concerning cytonuclear features and extent of necrosis. But interobserver agreement varied between poor and good for other classification systems. Agreement for Bloom and Richardson's grading was poor and it was less than expected by chance between the lst and 3rd observers. Interobserver agreement for nuclear grading in invazive ductal carcinoma was good between the 2nd and 3rd observers but agreement between other observers were poor.