Oncology Matrix • AJCC 8th Edition Staging
Tumour Depth (T)
Regional Nodes (N)
Distant Metastasis (M)
Staging Summary
Stage IA/B
T1: Mucosa / Submucosa
Invades lamina propria, muscularis mucosae, or submucosa.
N0: No Nodes
No regional lymph node metastasis.
M0: No Metastasis
No distant metastasis.
The AJCC 8th edition separates Squamous and Adenocarcinoma for pathological staging; this tool provides a unified clinical overview.
Guidelines & Evidence
Verified
Last Review: 2026-07-17
When to Use
When to Use
Staging of oesophageal and oesophagogastric junction (OGJ) cancers (Siewert I and II)
Distinguishing between Squamous Cell Carcinoma (SCC) and Adenocarcinoma (AC), which have different prognostic tables
To guide decision for neoadjuvant chemoradiotherapy (CROSS trial protocol) vs. surgery alone
Anatomical Boundary
The 8th edition defines OGJ cancers (Siewert I/II) as oesophageal. Siewert III (epicentre > 2cm into the stomach) is staged as Gastric Cancer.
How it Works
T (Primary Tumour) Depth
01
T1: Invades lamina propria, muscularis mucosae (a), or submucosa (b).
02
T2: Invades muscularis propria.
03
T3: Invades adventitia.
04
T4a: Invades resectable structures (pleura, pericardium, diaphragm).
05
T4b: Invades unresectable structures (aorta, vertebral body, trachea).
N (Lymph Nodes)
01
N0: No nodes.
02
N1: 1–2 nodes.
03
N2: 3–6 nodes.
04
N3: ≥ 7 nodes.
Grading and Location (SCC Only)
For SCC, the Location (Upper vs. Middle vs. Lower) and Histological Grade (G1-G3) are part of the overall staging group, reflecting the worse prognosis of proximal SCC.
Clinical Pearls
The CROSS Protocol Rule
Clinically-staged tumours ≥ T2 or N+ (Stage II/III) typically receive neoadjuvant chemoradiotherapy (CROSS trial: Carboplatin/Paclitaxel + 41.4Gy) prior to an Ivor-Lewis or McKeown oesophagectomy.
Early Cancer (T1a vs. T1b)
T1a (mucosal) carries a < 1% risk of lymph node metastasis and can be managed with EMR/ESD. T1b (submucosal) carries a ~20% risk of hidden lymph node metastasis, often requiring surgery even if the primary is removed endoscopically.
Clinical Pearls
EUS is the most accurate modality for T-staging; PET-CT is the gold standard for M-staging
Siewert II (Cardia) cancers often present a diagnostic dilemma in choosing between a total gastrectomy and an oesophagectomy
Presence of positive coeliac lymph nodes is considered M1 (Stage IV) in most cases
Next Steps
Management Decisions
01
T1a N0: Endoscopic Mucosal Resection (EMR) or ESD.
02
T2+ / N+: Neoadjuvantotherapy followed by surgical resection.
03
Stage IV: Palliative chemotherapy ± stenting for dysphagia.
Complementary Scoring
Siewert Classification (OGJ Location)
Gastric Cancer TNM Staging
Prague C&M Criteria (Barrett's)
The Evidence
The Staging Authority
AJCC Cancer Staging Manual, 8th Edition.
Amin MB et al. • Springer. 2017;Chapter 16: Oesophagus and Oesophagogastric Junction.
View Source• . ;
Prognostic Relevance
Cancer of the esophagus and esophagogastric junction: an 8th edition staging primer.
Rice TW et al. • Journal of Thoracic Oncology. 2017;12(1):36-42. Highlighting the changes from the 7th edition.
View SourceLast Comprehensive Review: 2026-07-17