Esophageal cancer overview

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Overview

Historical Perspective

Classification

Pathophysiology

Differentiating Esophageal cancer from other Diseases

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications and Prognosis

Diagnosis

Diagnostic Study of Choice

History and Symptoms

Physical Examination

Laboratory Findings

Electrocardiogram

X-ray

Echocardiography and Ultrasound

CT

MRI

Other Imaging Findings

Other Diagnostic Studies

Treatment

Medical Therapy

Surgery

Primary Prevention

Secondary Prevention

Cost-Effectiveness of Therapy

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Hadeel Maksoud M.D.[2]

Overview

Esophageal cancer is malignancy of the esophagus. There are two subtypes, squamous cell carcinoma and adenocarcinoma. Esophageal tumors usually lead to dysphagia, odynophagia, weight loss, and hematemesis and are diagnosed by carrying out a biopsy. Esophageal cancer must be differentiated from gastroesophageal reflux disease (GERD), Barrett's esophagus, esophageal achalasia, gastritis, gastric ulcer, and stomach cancer. Common risk factors in the development of esophageal cancer are smoking, alcohol, gastroesophageal reflux disease, and Barrett's esophagus. Small and localized tumors are treated with surgery, and advanced tumors are treated with chemotherapy, radiotherapy or a combination of both. Prognosis depends on the extent of the disease and other medical problems, but is fairly poor.

Classification

Esophageal cancer may be classified into squamous cell carcinoma or adenocarcinoma based on histology.

Pathophysiology

The pathophysiology of esophageal cancer depends on the histological subtype, whether squamous cell carcinoma or adenocarcinoma.

Differential diagnosis

Esophageal cancer must be differentiated from gastroesophageal reflux disease (GERD), Barrett's esophagus, esophageal achalasia, gastritis, gastric ulcer, and stomach cancer.

Epidemiology and Demographics

Esophageal cancer is the 6th leading cause of death from cancer and the 8th most common cancer in the world. The prevalence of esophageal cancer worldwide is about 3.5 per 100,000. In the United States, about 17000 new cases are diagnosed every year and 4.2 per 100,000 Americans has esophageal cancer. Esophageal cancer is mostly present in the "Asian belt" region which includes, China, Japan, India and Iran.

Risk Factors

Common risk factors in the development of esophageal cancer are tobacco smoking, alcohol, gastroesophageal reflux disease, and Barrett's esophagus.

Screening

Screening for esophageal cancer has not been established. Screening may be effective in reducing the incidence of esophageal adenocarcinoma, especially in Barrett's esophagus, but is left at the physician's discretion.

Natural History, Screening and Prognosis

The incidence of esophageal dysplasia turning malignant is very low, especially outside the United States. Complications of esophageal cancer include dysphagia, anemia, and tracheoesophageal fistula. This finding has caused some uncertainty as to the usefulness of screening. Esophageal cancer is associated with a 5 year survival rate of 20%.

Diagnosis

Diagnostic Study of Choice

Esophageal cancer is best diagnosed using an endoscope to visualize the esophageal lesion, followed by a biopsy to confirm the diagnosis. Endoscopic biopsy is done in a single visit at the hospital.

Staging

According to the American Joint Committee on Cancer, there are 4 stages of esophageal cancer based on the tumor spread.

History and Symptoms

Patient history in esophageal cancer includes pain in the throat or chest, regurgitation of food and hoarseness of voice. Symptoms of esophageal cancer include dysphagia, odynophagia, weight loss, and hematemesis. It should be noted that superficial esophageal cancer may have an insidious onset, so screening for Barrett's esophagus is important in this case to diagnose cancer earlier.

Physical examination

Physical examination of patients with esophageal cancer is usually unremarkable, unless the disease has metastasized, in which case cervical lymphadenopathy and jaundice may be seen.

Laboratory Findings

There are no diagnostic lab findings since diagnosis is based mainly on biopsy and esophageal endoscopy. However, routine tests are done to rule out anemia and metastases to the liver.

CT

CT scan may be used for staging of esophageal cancer. Findings on CT scan suggestive of esophageal cancer include eccentric or circumferential wall thickening, or peri-esophageal soft tissue and fat stranding.

MRI

MRI can be useful when used with positron emission tomography (PET) for staging esophageal cancer since it has greater soft tissue contrast than CT.

Other Imaging Findings

Other imaging studies for esophageal cancer include positive emission tomography scanning with 18-fluorodeoxyglucose (FDG-PET). FDG-PET is a noninvasive staging modality that is more sensitive than CT or EUS for the detection of distant metastases.

Other Diagnostic Studies

Laparoscopy, thoracoscopy and bronchoscopy can be used in addition to EUS and CT in locally advanced esophageal cancer to accurately diagnose and stage lymph node metastasis.

Treatment

Medical Therapy

The predominant therapy for esophageal cancer is surgical. Chemotherapy is used to treat advanced esophageal cancer. Chemotherapy can be used alone as monotherapy or in combination with radiotherapy or surgery. Chemotherapy may be used as adjuvant therapy to shrink a tumor before being surgically resected or as neoadjuvant therapy after surgery to kill any cancerous cells that may have been left, and finally, in advanced tumors to shrink them or to relieve symptoms.

Surgery

The predominant therapy for esophageal cancer is surgical resection by esophagectomy. The disease must be localised in order for it to be operable. Adjunctive chemotherapy and radiation may be required in more advanced cases of esophageal cancer, and to shrink down a localised tumor so that it may become operable.

Primary Prevention

Effective measures for the primary prevention of esophageal cancer include the treatment of gastroesophageal reflux disease and Barrett's esophagus, weight loss, avoidance of tobacco and alcohol, and a diet rich in fruits and vegetables.

Secondary Prevention

Secondary prevention may be effective in reducing the incidence of esophageal cancer, if treated early at the dysplasia stage with monoclonal antibody therapy. At present, there is no particular program in place to reduce the incidence of esophageal cancer.


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