|Classification and external resources|
Diagram showing esophageal cancer in an advanced stage with spread to the liver
Esophageal cancer (or oesophageal cancer) is cancer arising from the esophagus—the foodpipe that runs between the throat and the stomach. Symptoms often include trouble swallowing and weight loss. Other symptoms may include pain with swallowing, a hoarse voice, enlarged lymph nodes (glands) around the clavicle (collarbone), a dry cough, and possibly coughing up or vomiting blood.
The two main sub-types of esophageal cancer are squamous-cell carcinoma, which is more common in the developing world, and adenocarcinoma, which is more common in the developed world. A number of less common types also occur. Squamous-cell carcinoma arises from the skin cells that line the esophagus. Adenocarcinoma arises from glandular cells present in the lower third of the esophagus, often where they have already transformed to intestinal cell type (a condition known as Barrett's esophagus). The most common causes of the squamous-cell type are: tobacco, alcohol, very hot drinks, and a poor diet. The most common causes of the adenocarcinoma type are smoking tobacco, obesity, and acid reflux.
The disease is diagnosed by biopsy done by an endoscope (a fiberoptic camera). Prevention includes stopping smoking and a healthy diet. Treatment is based on the cancer's stage and location, together with the person's general condition and individual preferences. Small localized squamous-cell cancers may be treated with surgery alone with the hope of a cure. In most other cases, chemotherapy with or without radiation therapy is used along with surgery. Larger tumors may have their growth slowed with chemotherapy and radiation therapy. In the presence of extensive disease or if the affected person is not fit enough to undergo surgery, palliative care is often recommended. Outcomes are related to the extent of the disease and other medical conditions, but generally tend to be fairly poor, as diagnosis is often late. Five-year survival rates are around 13% to 18%.
As of 2012, esophageal cancer is the eighth-most common cancer globally with 456,000 new cases during the year. It caused about 400,000 deaths that year, up from 345,000 in 1990. Rates vary widely between countries, with about half of all cases occurring in China. It is around three times more common in men than in women.
- 1 Signs and symptoms
- 2 Causes
- 3 Diagnosis
- 4 Prevention
- 5 Management
- 6 Prognosis
- 7 Epidemiology
- 8 Research directions
- 9 References
- 10 External links
Signs and symptoms
Prominent symptoms usually do not appear until the cancer has infiltrated over 60% of the tube's circumference, by which time the tumor is already in an advanced stage. Onset of symptoms is usually caused by narrowing of the tube due to the physical presence of the tumor.
The first and the most common symptom is usually difficulty in swallowing, often initially experienced with solid foods and later with softer foods and liquids. Pain when swallowing is less usual initially. Weight loss is often an initial symptom in cases of squamous-cell carcinoma, though not usually in cases of adenocarcinoma. Eventual weight loss due to reduced appetite and undernutrition is common. Pain behind the breastbone or in the region around the stomach often feels like heartburn. The pain can frequently be severe, worsening when food of any sort is swallowed. Another sign may be an unusually husky, raspy, or hoarse-sounding cough, a result of the tumor affecting the recurrent laryngeal nerve.
The presence of the tumor may disrupt the normal contractions of the esophagus on swallowing. This can lead to nausea and vomiting, regurgitation of food, coughing, and an increased risk of aspiration pneumonia. Abnormal connections (fistulas) occasionally develop between the esophagus and the trachea (windpipe). Early signs of this serious complication may be coughing on drinking or eating. Fistulas often lead to pneumonia, typical signs of which are cough, fever, or aspiration. The tumor surface may be fragile and bleed, causing vomiting of blood. Compression of local structures occurs in advanced disease, leading to such problems as upper airway obstruction and superior vena cava syndrome. Symptoms of hypercalcemia (excess calcium in the blood) may occur.
If the cancer has spread elsewhere, symptoms related to metastatic disease may appear. Common sites of spread include nearby lymph nodes, the liver, lungs and bone. Liver metastasis can cause jaundice and abdominal swelling (ascites). Lung metastasis can cause, among other symptoms, impaired breathing due to excess fluid around the lungs (pleural effusion), and dyspnea (the feelings often associated with impaired breathing).
The two main types (i.e. squamous-cell carcinoma and adenocarcinoma) have distinct sets of risk factors. Squamous-cell carcinoma is linked to lifestyle factors such as smoking and alcohol. Adenocarcinoma has been linked to effects of long-term acid reflux. Tobacco is a risk factor for both types. Both types are more common in men and in the over-60s.
The two major risk factors for esophageal squamous-cell carcinoma are tobacco (smoking or chewing) and alcohol. The combination of tobacco and alcohol has a strong synergistic effect. Some data suggest that about half of all cases are due to tobacco and about one-third to alcohol, while over three-quarters of the cases in men are due to the combination of smoking and heavy drinking. The risks associated with alcohol appear to be linked to its aldehyde metabolite and to mutations in certain related enzymes. Such metabolic variants are relatively common in Asia.
High levels of dietary exposure to nitrosamines (chemical compounds found both in tobacco smoke and certain foodstuffs) appear to be a relevant risk factor. Unfavorable dietary patterns seem to involve exposure to nitrosamines through processed and barbecued meats, pickled vegetables, etc., and a low intake of fresh foods. Other associated factors include nutritional deficiencies, low socioeconomic status, and poor oral hygiene. Chewing betel nut (areca) is an important risk factor in Asia.
Male predominance is particularly strong in this type of esophageal cancer, which occurs about 7 to 10 times more frequently in men. This imbalance may be related to the characteristics and interactions of other known risk factors, including acid reflux and obesity.
The long-term erosive effects of acid reflux (an extremely common condition, also known as gastroesophageal reflux disease or GERD) have been strongly linked to this type of cancer. Longstanding GERD can induce a change of cell type in the lower portion of the esophagus in response to erosion of its squamous lining. This phenomenon, known as Barrett's esophagus, seems to appear about 20 years later in women than in men, maybe due to hormonal factors. Having symptomatic GERD or bile reflux makes Barrett's esophagus more likely, which in turn raises the risk of further changes that can ultimately lead to adenocarcinoma. The risk of developing adenocarcinoma in the presence of Barrett's esophagus is unclear, and may in the past have been overestimated.
Obesity and overweight both appear to be associated with increased risk. The association with obesity seems to be the strongest of any type of obesity-related cancer, though the reasons for this remain unclear. Abdominal obesity seems to be of particular relevance, given the closeness of its association with this type of cancer, as well as with both GERD and Barrett's esophagus. This type of obesity is characteristic of men. Physiologically, it stimulates GERD and also has other chronic inflammatory effects.
- Head and neck cancer is associated with second primary tumors in the region, including esophageal squamous-cell carcinomas, due to field cancerization (i.e. a regional reaction to long-term carcinogenic exposure).
- History of radiation therapy for other conditions in the chest is a risk factor for esophageal adenocarcinoma.
- Corrosive injury to the esophagus by accidentally or intentionally swallowing caustic substances is a risk factor for squamous cell carcinoma.
- Tylosis with esophageal cancer is a rare familial disease that has been linked to a mutation in the RHBDF2 gene: it involves thickening of the skin of the palms and soles and a high lifetime risk of squamous cell carcinoma.
- Achalasia (i.e. lack of the involuntary reflex in the esophagus after swallowing) appears to be a risk factor for both main types of esophageal cancer, at least in men, due to stagnation of trapped food and drink.
- Plummer–Vinson syndrome (a rare disease that involves esophageal webs) is also a risk factor.
- There is some evidence suggesting a possible causal association between human papillomavirus (HPV) and esophageal squamous-cell carcinoma. The relationship is unclear. Possible relevance of HPV could be greater in places that have a particularly high incidence of this form of the disease, as in some Asian countries, including China.
- There is limited evidence to support an association between celiac disease and esophageal cancer.
- Although the Helicobacter pylori bacterium is a cause of GERD and a risk factor for gastric cancer, it seems to be associated with reduced risk of esophageal adenocarcinoma. The biological explanation for a protective effect is somewhat unclear. One explanation is that some strains of H. pylori reduce stomach acid, thereby reducing damage by GERD. Acid reduction due to gastric atrophy induced by H. pylori may be a relevant factor.
Although an occlusive tumor may be suspected on a barium swallow or barium meal, the diagnosis is best made with esophagogastroduodenoscopy (endoscopy); this involves the passing of a flexible tube with a light and camera down the esophagus and examining the wall. Biopsies taken of suspicious lesions are then examined histologically for signs of malignancy.
Additional testing is usually performed to estimate the tumor stage, for which the TNM staging system is used. Computed tomography (CT) of the chest, abdomen and pelvis can evaluate whether the cancer has spread to adjacent tissues or distant organs (especially liver and lymph nodes). The sensitivity of a CT scan is limited by its ability to detect masses (e.g. enlarged lymph nodes or involved organs) generally larger than 1 cm. Positron emission tomography is also used to estimate the extent of the disease and is regarded as more precise than CT alone. Esophageal endoscopic ultrasound can provide staging information regarding the level of tumor invasion, and possible spread to regional lymph nodes.
The location of the tumor is generally measured by the distance from the teeth. The esophagus (25 cm or 10 in long) is commonly divided into three parts for purposes of determining the location. Adenocarcinomas tend to occur nearer the stomach and squamous cell carcinomas nearer the throat, but either may arise anywhere in the esophagus.
Esophageal cancers are typically carcinomas which arise from the epithelium, or surface lining, of the esophagus. Most esophageal cancers fall into one of two classes: squamous-cell carcinomas, which are similar to head and neck cancer in their appearance and association with tobacco and alcohol consumption, and adenocarcinomas, which are often associated with a history of GERD and Barrett's esophagus. A general rule of thumb is that a cancer in the upper two-thirds is likely to be a squamous-cell carcinoma and one in the lower one-third an adenocarcinoma.
Rare histologic types of esophageal cancer are different variants of the squamous-cell carcinoma, and nonepithelial tumors, such as leiomyosarcoma, malignant melanoma, rhabdomyosarcoma, lymphoma, and others.
Endoscopic image of an esophageal adenocarcinoma
Endoscopic image of Barrett esophagus – a frequent precursor of esophageal adenocarcinoma
Endoscopy and radial endoscopic ultrasound images of a submucosal tumor in the central portion of the esophagus
Contrast CT scan showing an esophageal tumor (axial view)
According to the National Cancer Institute, "diets high in cruciferous (cabbage, broccoli/broccolini, cauliflower, Brussels sprouts) and green and yellow vegetables and fruits are associated with a decreased risk of esophageal cancer." Dietary fiber is thought to be protective, especially against esophageal adenocarcinoma.
People with Barrett esophagus (a change in the cells lining the lower esophagus) are at much higher risk, and may receive regular endoscopic screening for the early signs of cancer. Because the benefit of screening for adenocarcinoma in people without symptoms is unclear, it is not recommended in the United States. Some areas of the world with high rates of squamous-carcinoma have screening programs.
The treatment is determined by the cellular type of cancer (adenocarcinoma or squamous-cell carcinoma vs other types), the stage of the disease, the general condition of the patient, and other diseases present. Treatment should be managed by an multidisciplinary team covering the various specialities involved. Adequate nutrition needs to be assured, and adequate dental care is vital.
A number of types and combinations of surgery, chemotherapy and radiotherapy, as well as other therapies, have been used over recent decades, but there has been no transformative improvement in outlook for patients equivalent to that seen in some other cancers.
Early-stage adenocarcinomas will be treated by surgery where this is possible, although esophagectomy, the removal of all or part of the esophagus, is a difficult operation with a relatively high risk of mortality or post-operative difficulties; the benefits of surgery are less clear for early-stage squamous cancers. There are a number of surgical options, and the best choices for particular situations remain the subject of research and discussion. As well as the characteristics and location of the tumor, other factors include the condition of the patient, and the type of operation to which the surgical team are most used. Surgical outcomes are likely to be better in large centers where the procedures are frequently performed. If the cancer has spread to other parts of the body, esophagectomy will now not normally be performed.
Esophagectomy is the removal of a segment of the esophagus; as this shortens the length of the remaining esophagus, some other segment of the digestive tract is pulled up through the chest cavity and interposed. This is usually the stomach or part of the large intestine (colon) or the jejunum. The joining up of the stomach to a shortened esophagus is called an esophagogastric anastomosis.
There are a number of different methods of esophagectomy; which is used will depend on the nature and location of the tumor, and the preference of the surgeon. Clear evidence from clinical trials for which approaches give the best outcomes in different circumstances is lacking. The first distinction, based on how the surgeon enters the body, is between a transhiatial procedure as opposed to a transthoracic. The more recent transhiatial approach avoids the need to open the chest, instead the surgeon enters the body through an incision in the lower abdomen and another in the neck. The esophagus is freed from the surrounding tissues and cut away as necessary. The stomach is then pushed through the esophageal hiatus, the hole in the diaphragm for the esophagus, and joined to the remaining upper part of the esophagus at the neck.
The traditional transthoracic approach enters the body through the chest, and has a number of variations: the thoracoabdominal approach opens the abdominal and thoracic cavities together, the two-stage Ivor Lewis (also called Lewis–Tanner) approach involves an initial laparotomy and construction of a gastric tube, followed by a right thoracotomy to excise the tumor and create an esophagogastric anastomosis, the three-stage McKeown approach adds a third incision in the neck to complete the cervical anastomosis. Recent approaches by some surgeons use what is called extended esophagectomy, where more surrounding tissue including lymph nodes is removed en bloc.
If the person cannot swallow at all, an esophageal stent may be inserted to keep the esophagus open; stents may also assist in occluding fistulas. A nasogastric tube may be necessary to continue feeding while treatment for the tumor is given, and some patients require a gastrostomy (feeding hole in the skin that gives direct access to the stomach). The latter two are especially important if the patient tends to aspirate food or saliva into the airways, predisposing for aspiration pneumonia.
Chemotherapy and radiotherapy
Chemotherapy depends on the tumor type, but tends to be cisplatin-based (or carboplatin or oxaliplatin) every three weeks with fluorouracil (5-FU) either continuously or every three weeks. In more recent studies, addition of epirubicin was better than other comparable regimens in advanced nonresectable cancer. Chemotherapy may be given after surgery (adjuvant, i.e. to reduce risk of recurrence), before surgery (neoadjuvant) or if surgery is not possible; in this case, cisplatin and 5-FU are used. Ongoing trials compare various combinations of chemotherapy; the phase II/III REAL-2 trial – for example – compares four regimens containing epirubicin and either cisplatin or oxaliplatin, and either continuously infused fluorouracil or capecitabine.
Radiotherapy is given before, during, or after chemotherapy or surgery, and sometimes on its own to control symptoms. In patients with localised disease but contraindications to surgery, "radical radiotherapy" may be used with curative intent.
Forms of endoscopic therapy have been used for stage 0 and I disease: endoscopic mucosal resection (EMR)  and mucosal ablation using radiofrequency ablation, photodynamic therapy, Nd-YAG laser, or argon plasma coagulation.
Laser therapy is the use of high-intensity light to destroy tumor cells; it affects only the treated area. This is typically done if the cancer cannot be removed by surgery. The relief of a blockage can help with pain and difficulty swallowing. Photodynamic therapy, a type of laser therapy, involves the use of drugs that are absorbed by cancer cells; when exposed to a special light, the drugs become active and destroy the cancer cells.
Radiofrequency ablation is a new treatment modality for the treatment of Barrett's esophagus and dysplasia, and has been the subject of numerous published clinical trials. The findings demonstrate radiofrequency ablation has an efficacy of 80–90% or greater with respect to complete clearance of Barrett's esophagus and dysplasia with durability up to five years and a favorable safety profile. Recent clinical trials have shown that endoscopic resection of esophageal mucosal irregularities and nodules which contain dysplasia or carcinoma combined with subsequent radiofrequency ablation of the remaining flat Barrett's esophagus and dysplasia can effectively and safely eradicate the disease. Further, a recent multicenter randomized control trial found that in patients with Barrett's esophagus containing nodules or mucosal irregularities which contained high grade dysplasia or cancer, subsequent radiofrequency ablation resulted not only in eradication of Barrett's esophagus and dysplasia, but also had significantly less esophageal stricture versus patients who had circumferential endoscopic mucosal resection for their disease.
Patients are followed up frequently after a treatment regimen has been completed. Frequently, other treatments are necessary to improve symptoms and maximize nutrition.
In general, the prognosis of esophageal cancer is quite poor, because most patients present with advanced disease. By the time the first symptoms (such as difficulty swallowing) appear, the cancer has already well progressed. The overall five-year survival rate (5YSR) in the United States is around 15%, with most people dying within the first year of diagnosis.
Individualized prognosis depends largely on stage. Those with cancer restricted entirely to the esophageal mucosa have about an 80% 5YSR, but submucosal involvement brings this down to less than 50%. Extension into the muscularis propria (muscle layer of the esophagus) suggests a 20% 5YSR, and extension to the structures adjacent to the esophagus predict a 7% 5YSR. Patients with distant metastases (who are not candidates for curative surgery) have a less than 3% 5YSR.
Esophageal cancer is the eighth most frequently diagnosed cancer worldwide, and because of its poor prognosis it is the sixth most common cause of cancer-related death. It caused about 395,000 deaths in 2010, up from 345,000 in 1990. Its incidence varies greatly among different geographical areas, as does the relative preponderance of the two main types. The cancer is particularly frequent in the so-called "Asian esophageal cancer belt", an area that passes through northern China, southern Russia, north-eastern Iran, northern Afghanistan and eastern Turkey. In Sub-Saharan Africa, where the problem has long been recognized, incidence is much higher in countries in the eastern and southern parts of the region.
Squamous-cell carcinoma is the most common type of esophageal cancer worldwide, comprising 60–70% of all cases, while adenocarcinomas account for a further 20–30% (melanomas, leiomyosarcomas, carcinoids and lymphomas being rarely diagnosed). In the Asian esophageal cancer belt, incidence rates of esophageal squamous-cell carcinoma have been reported to be as high as 100 new cases per 100,000 person-years.
In Western countries, esophageal adenocarcinoma has become the dominant form of the disease, following an increase in incidence over recent decades (in contrast to the incidence of the squamous-cell type, which has remained largely stable).
In the United States, esophageal cancer is the seventh-leading cause of cancer death among males (making up 4% of the total). The National Cancer Institute estimated there were about 18,000 new cases and more than 15,000 deaths from esophageal cancer in 2013 (the American Cancer Society estimated that during 2014, about 18,170 new esophageal cancer cases will be diagnosed, resulting in 15,450 deaths). The squamous-cell carcinoma type is more common among African American males with a history of heavy smoking or alcohol use. Until the 1970s, squamous-cell carcinoma accounted for the vast majority of esophageal cancers in the United States. In recent decades, incidence of adenocarcinoma of the esophagus (which is associated with Barrett's esophagus) steadily rose in the United States to the point that it has now surpassed squamous-cell carcinoma. In contrast to squamous-cell carcinoma, esophageal adenocarcinoma is more common in Caucasian men (over the age of 60) than it is in African Americans. Multiple reports indicate esophageal adenocarcinoma incidence has increased during the past 20 years, especially in non-Hispanic white men. Esophageal adenocarcinoma age-adjusted incidence increased in New Mexico from 1973 to 1997. This increase was found in non-Hispanic whites and Hispanics and became predominant in non-Hispanic whites. Esophageal cancer incidence and mortality rates for African Americans continue to be higher than the rate for Causasians. However, incidence and mortality of esophageal cancer has significantly decreased among African Americans since the early 1980s, whereas with Caucasians, it has slightly increased. Between 1975 and 2004, incidence of the adenocarcinoma type increased among white American males by over 460% and among white American females by 335%.
|This section requires expansion. (August 2014)|
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