a) Tumors with infiltration (INF)-alpha invasion grow expansively, and the border between the tumor and the surrounding tissue is clearly marginated.
b) Tumors with INF-beta invasion exhibit the coexistence of clusters of tumor cells and surrounding tissue at the edge, but the two components are distinct from each other.
c) Tumors with INF-gamma invasion exhibit small clustered tumor cells at the edge, and the distinction of tumor cells from surrounding tissue is obscured.
Original magnification: X20
