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The categories of IASLC grade
| Grade | Differentiation | Pattern (2020) | Pattern (2015) |
|---|---|---|---|
| 1 | Well differentiated | Lepidic predominant tumors wiht <20% of high-grade patters | Lepidic predominant |
| 2 | Moderately differentiated | Acinar or papillary predominant tumors with <20% of high-grade patters | Acinar or papillary predominant |
| 3 | Poorly differentiated | Any tumor with ≥ 20% of high-grade patterns (solid, micropapillary, complex glandular) | Solid or micropapillary predominant |
