Grade | Effect |
I | Little or no effect identified |
II | Areas of acellular tumor osteoid, necrotic, or fibrotic material attributable to the effect of chemotherapy, with other areas of histologically viable tumor |
III | Predominant areas of acellular tumor osteoid, necrotic, or fibrotic material attributable to the effect of chemotherapy, with only scattered foci of histologically viable tumor cells identified |
IV | No histologic evidence of viable tumor identified within the entire specimen |
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