Fig. 4

Photomicrograph of tumor tissue. A Malignant cells with minimal areas of necrosis in group IV (hematoxylin and eosin (H&E), ×100). B Malignant cells with moderate areas of necrosis in group V (H&E, ×200). C Malignant cells with extensive areas of necrosis in group V (H&E, ×200). D Malignant cells with moderate areas of necrosis in group VI (H&E, ×200). E Malignant cells with extensive areas of necrosis in group VI (H&E ×200). F Malignant cells with diffuse areas of necrosis in group VII (H&E ×200)