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| Grading of tumor regression in non-small cell lung cancer, Junker et al., 2001 |
| Grading I | No tumor regression or only spontaneous tumor regression in the sections of the primary lesion and mediastinal lymph nodes |
| Grading IIa | Morphologic evidence of therapy-induced tumor regression with at least 10% residual tumor cells in the sections of the primary lesion and/or mediastinal lymph nodes presenting more than focal microscopic disease |
| Grading IIb | <10% residual tumor cells in the sections of the primary lesion and/or mediastinal lymph nodes presenting focal microscopic disease |
| Grading III | Complete tumor regression with no evidence of vital tumor tissue in the section of the primary lesion and mediastinal lymph nodes |