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It is defined as tumour that is in the air space and some distance from the main tumour.<ref name=pmid33199839>{{cite journal |authors=Han YB, Kim H, Mino-Kenudson M, Cho S, Kwon HJ, Lee KR, Kwon S, Lee J, Kim K, Jheon S, Lee CT, Lee JS, Kook W, Chung JH |title=Tumor spread through air spaces (STAS): prognostic significance of grading in non-small cell lung cancer |journal=Mod Pathol |volume=34 |issue=3 |pages=549–561 |date=March 2021 |pmid=33199839 |doi=10.1038/s41379-020-00709-2 |url=}}</ref> | It is defined as tumour that is in the air space and some distance from the main tumour.<ref name=pmid33199839>{{cite journal |authors=Han YB, Kim H, Mino-Kenudson M, Cho S, Kwon HJ, Lee KR, Kwon S, Lee J, Kim K, Jheon S, Lee CT, Lee JS, Kook W, Chung JH |title=Tumor spread through air spaces (STAS): prognostic significance of grading in non-small cell lung cancer |journal=Mod Pathol |volume=34 |issue=3 |pages=549–561 |date=March 2021 |pmid=33199839 |doi=10.1038/s41379-020-00709-2 |url=}}</ref> | ||
==Grading of STATS== | |||
A study by Han ''el al.'' divided STATS into two groups: | A study by Han ''el al.'' divided STATS into two groups: | ||
*Grade I: < 2.5 mm from the tumour. | *Grade I: < 2.5 mm from the tumour. |
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