S3.
Pathological TNM staging of squamous cell carcinoma of the esophagus (pTNM)
| Stage | TNM | Grade | Tumor Location |
| 0 | Tis (HGD) N0 M0 | Any | |
| IA | T1a N0 M0 | G1 | Any |
| T1a N0 M0 | GX | Any | |
| IB | T1a N0 M0 | G2−G3 | Any |
| T1b N0 M0 | Any | Any | |
| T1b N0 M0 | GX | Any | |
| T2 N0 M0 | G1 | Any | |
| IIA | T2 N0 M0 | G2−G3 | Any |
| T2 N0 M0 | GX | Any | |
| T3 N0 M0 | Any | Lower | |
| T3 N0 M0 | G1 | Upper/middle | |
| IIB | T3 N0 M0 | G2−G3 | Upper/middle |
| T3 N0 M0 | GX | Any | |
| T3 N0 M0 | Any | Location X | |
| T1 N1 M0 | Any | Any | |
| IIIA | T1 N2 M0 | Any | Any |
| T2 N1 M0 | Any | Any | |
| IIIB | T2 N2 M0 | Any | Any |
| T3 N1-2 M0 | Any | Any | |
| T4a N0-1 M0 | Any | Any | |
| IVA | T4a N2 M0 | Any | Any |
| T4b N0-2 M0 | Any | Any | |
| Any T N3 M0 | Any | Any | |
| IVB | Any T Any N M1 | Any | Any |