Carcinoma of Oesophagus

Overview

Diagnosed LATE (after dysphagia + organ limits already transgressed). Men >50yrs. DISMAL prognosis: 70% dead within 1yr, 5yr survival 5-10%.

Etiology

1. Diet/habits — smoking, alcohol, fungus-contaminated food, vitamin/trace element deficiency
2. Oesophageal disorders — oesophagitis(esp. Barrett’s→adenocarcinoma), achalasia, hiatus hernia, diverticula, Plummer-Vinson
3. Other — race(↑Chinese/Japanese, ↑Black>White), family history(TYLOSIS=keratosis palmaris et plantaris), genetic(coeliac disease, epidermolysis bullosa, tylosis), HPV(recent addition)

Molecular: p53 abnormality = UNIFYING mechanistic thread linking tobacco+alcohol+Barrett’s oesophagus (not 3 independent factors).

Morphology — 2 main types, different profiles

Squamous cell (epidermoid) carcinoma — 90% of cases

Exceeded in GI cancer incidence only by colon/rectum/stomach. 6th-7th decade, more men. Sites = 3 constriction areas, HALF in MIDDLE third > lower > upper.

Gross (3 patterns):

1. POLYPOID FUNGATING — commonest, cauliflower-like friable mass
2. ULCERATING — next commonest, necrotic ulcer, everted edges
3. DIFFUSE INFILTRATING — annular stenosing narrowing

Micro: mostly well-mod differentiated (prickle cells, keratin, epithelial pearls). ±non-keratinising/anaplastic. Variant: VERRUCOUS SCC (exophytic, slow-growing, extremely well-differentiated).

Adenocarcinoma — <10% of cases

Men, 4th-5th decade. Lower+middle third. STRONG association with BARRETT’S OESOPHAGUS (gastric/intestinal epithelium foci).

Gross: nodular elevated mass, lower oesophagus.

Micro (3 patterns): INTESTINAL type(resembles intestinal/gastric adenocarcinoma), ADENOSQUAMOUS type(admixture), ADENOID CYSTIC type(uncommon, resembles salivary gland tumour, cribriform).

Must distinguish from gastric cardia adenocarcinoma — check for normal oesophageal mucosa on BOTH distal+proximal margins.

Other carcinomas (occasional)

Mucoepidermoid, malignant melanoma(from melanoblasts), small cell carcinoma(from argyrophil cells), undifferentiated carcinoma, carcinosarcoma. Secondary tumours rare(breast/kidney/adrenal).

Spread

1. LOCAL — MOST IMPORTANT, critical for surgery. Transverse+longitudinal. Down→stomach, up→hypopharynx, →trachea(tracheo-oesophageal fistula), →larynx(hoarseness), →mediastinum/lungs/bronchi/pleura/aorta. (Explains why surgery is technically demanding — proximity to vital structures makes local invasion alone inoperable)
2. LYMPHATIC — submucosal permeation→satellite nodules; →cervical/para-oesophageal/tracheobronchial/subdiaphragmatic nodes
3. HAEMATOGENOUS — RARE (death occurs early via other routes first). If occurs: lungs, liver, adrenals

Clinical relevance

Squamous-vs-adenocarcinoma split = distinct risk-profile+location pairing (SCC=smoking/alcohol/diet+middle third; adenocarcinoma=Barrett’s+lower third) — use as organising axis, not parallel lists. Local spread’s surgical importance = explains technical difficulty of oesophageal surgery (trachea/larynx/aorta/mediastinum proximity). p53 = unifying molecular thread for tobacco+alcohol+Barrett’s. Dismal prognosis figures directly trace to late-detection pattern — classic illustration of why early detection matters disproportionately here.

Overview

Oesophageal carcinoma is typically diagnosed late, after symptomatic obstruction (dysphagia) develops and the tumour has already transgressed the organ’s anatomical limits. More common in men over 50. Prognosis is dismal — even with standard therapy (surgical resection ± irradiation), 70% of patients die within one year of diagnosis; 5-year survival is only 5–10%.

Etiology

Exact etiology unknown, but several implicated factors:

1. Diet and personal habits: heavy smoking, alcohol consumption, fungus-contaminated food intake, nutritional deficiency of vitamins/trace elements.
2. Oesophageal disorders: oesophagitis (especially Barrett’s oesophagus for adenocarcinoma), achalasia, hiatus hernia, diverticula, Plummer-Vinson syndrome.
3. Other factors: race (more common in Chinese/Japanese than Western populations; more frequent in Black than White populations); family history (association with tylosis, keratosis palmaris et plantaris); genetic predisposition (coeliac disease, epidermolysis bullosa, tylosis); HPV infection (a recent addition to the etiologic list).

At the molecular level, p53 tumour suppressor gene abnormality is associated with several of these risk factors, notably tobacco/alcohol consumption and proven Barrett’s oesophagus.

Morphology

Two main types — squamous cell (epidermoid) carcinoma and adenocarcinoma — with different sites of predilection.

Squamous Cell (Epidermoid) Carcinoma

Comprises 90% of primary oesophageal cancers; exceeded in GI-cancer incidence only by colon, rectum, and stomach carcinomas. Occurs in the 6th–7th decades, more common in men. Sites of predilection are the three oesophageal constriction areas — half occur in the middle third, then lower third, then upper third.

Gross — 3 patterns:

1. Polypoid fungating type — commonest; cauliflower-like, friable, luminal-protruding mass.
2. Ulcerating type — next commonest; necrotic ulcer with everted edges.
3. Diffuse infiltrating type — annular, stenosing luminal narrowing from wall infiltration.

Micro: mostly well- to moderately-differentiated, with prickle cells, keratin formation, epithelial pearls; non-keratinising and anaplastic patterns also occur. A distinct exophytic, slow-growing, extremely well-differentiated variant is verrucous squamous cell carcinoma.

Adenocarcinoma

Comprises <10% of primary oesophageal cancer. Occurs predominantly in men in their 4th–5th decades. Common locations: lower and middle third. Has a strong, definite association with Barrett’s oesophagus (gastric/intestinal-type epithelium foci).

Gross: nodular, elevated mass in the lower oesophagus.

Micro — 3 patterns:

1. Intestinal type — pattern resembling intestinal/gastric adenocarcinoma.
2. Adenosquamous type — irregular admixture of adeno- and squamous cell carcinoma.
3. Adenoid cystic type — uncommon, resembling the same salivary gland tumour pattern (cribriform appearance).

Must be distinguished from gastric cardia adenocarcinoma by identifying normal oesophageal mucosa on both the distal and proximal tumour margins.

Other Carcinomas

Occasional additional varieties: mucoepidermoid carcinoma (squamous + mucus-secreting features), malignant melanoma (from epithelial melanoblasts), small cell carcinoma (from basal-layer argyrophil cells), undifferentiated carcinoma (unclassifiable anaplastic), carcinosarcoma (malignant epithelial + sarcomatous components). Secondary (metastatic) tumours rarely occur, from breast, kidney, and adrenal primaries.

Spread

1. Local spread — the most important mode, critical for surgical planning; occurs transversely and longitudinally. May invade downward into the stomach, upward into the hypopharynx, into the trachea (causing tracheo-oesophageal fistula), or the larynx (causing hoarseness); may invade the muscular wall to involve the mediastinum, lungs, bronchi, pleura, aorta.
2. Lymphatic spread — submucosal lymphatic permeation may produce multiple satellite nodules away from the main tumour; metastasises to cervical, para-oesophageal, tracheo-bronchial, and subdiaphragmatic nodes.
3. Haematogenous spread — rare, probably because death occurs early from other spread modes invading vital structures first; when it occurs, deposits form in lungs, liver, adrenals.

Clinical Relevance

• The squamous-vs-adenocarcinoma split maps directly onto distinct risk-factor profiles and locations — squamous cell carcinoma tracks with smoking/alcohol/diet in the middle third, while adenocarcinoma tracks specifically with Barrett’s oesophagus in the lower third — worth using this pairing as the organising axis for the whole topic rather than memorising the two types as parallel lists.
• Local spread being singled out as the mode “of great importance for surgical treatment” reflects why oesophageal cancer surgery is technically demanding — proximity to trachea, larynx, aorta, and mediastinal structures means local invasion alone can render a tumour inoperable well before distant metastasis develops.
• The p53 abnormality link tying together tobacco, alcohol, and Barrett’s oesophagus as converging molecular pathways (rather than three independent risk factors) is worth retaining as the unifying mechanistic thread for this cancer’s etiology.
• The dismal prognosis figures (70% dead within a year, 5–10% five-year survival) are directly explained by the late-detection pattern described in the overview — symptomatic dysphagia only appears once the tumour has already breached the organ’s confines, making this one of the clearest illustrations of why early detection matters disproportionately for this cancer.

• Squamous cell carcinoma vs adenocarcinoma comparison: site of predilection, age group, and key risk factor for each, shown on an oesophagus outline
• Three gross squamous cell carcinoma patterns (polypoid fungating/ulcerating/diffuse infiltrating) side by side