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New staging system for extranodal NK/T‐cell lymphoma, nasal type
| Limited disease | Extensive disease | |
|---|---|---|
| Category | UAT presentation: Stage I/II without local tumor invasiveness | Non‐UAT presentation UAT presentation: Stage I/II with local tumor invasiveness Stage III/IV |
| Long‐term survival | Yes | No |
| Prognosis | Favorable | Unfavorable |
| Usefulness of radiotherapy | Yes | Questionable |
UAT, upper aerodigestive tract.
