Table 2.

Classification of the College of American Pathologists for Treated Pancreatic Ductal Adenocarcinoma (Ryan, Histopathology, 2005).

CAP Score Index	Description
0	No viable cancer cells (complete response)
1	Single cells or rare small groups of cancer cells (near complete response)
2	Residual cancer with evident tumor regression,
3	Extensive residual cancer with no evident tumor regression (poor or no response)