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Figure 1: (a) Grade I IDC – Greater than 75% of tumor cells show tubule formation with minimal nuclear atypia and occasional mitoses (H and E, ×100); (b) Grade II IDC – Less than 75% of tumor cells are showing tubule formation with moderate nuclear atypia and 10-12 mitoses/10 HPF (H and E, ×100); (c) Grade III IDC – Tumor cells are arranged in sheets with less than 10% cells showing tubule formation along with marked nuclear atypia and frequent mitoses (>/10HPF) (H and E, ×100)

Figure 1: (a) Grade I IDC – Greater than 75% of tumor cells show tubule formation with minimal nuclear atypia and occasional mitoses (H and E, ×100); (b) Grade II IDC – Less than 75% of tumor cells are showing tubule formation with moderate nuclear atypia and 10-12 mitoses/10 HPF (H and E, ×100); (c) Grade III IDC – Tumor cells are arranged in sheets with less than 10% cells showing tubule formation along with marked nuclear atypia and frequent mitoses (>/10HPF) (H and E, ×100)