- Author: Elwyn C Cabebe, MD; Chief Editor: N Joseph Espat, MD, MS, FACS more...
Gastric cancer is the third most common cause of cancer-related death in the world, and it remains difficult to cure in Western countries, primarily because most patients present with advanced disease. In the United States, stomach malignancy is currently the 15th most common cancer. The stomach begins at the gastroesophageal junction and ends at the duodenum. See the image below.
Signs and symptoms
Early gastric cancer has no associated symptoms; however, some patients with incidental complaints are diagnosed with early gastric cancer. Most symptoms of gastric cancer reflect advanced disease. All physical signs in gastric cancer are late events. By the time they develop, the disease is almost invariably too far advanced for curative procedures.
Signs and symptoms of gastric cancer include the following:
Nausea or vomiting
Loss of appetite
Melena or pallor from anemia
Palpable enlarged stomach with succussion splash
Enlarged lymph nodes such as Virchow nodes (ie, left supraclavicular) and Irish node (anterior axillary)
Late complications of gastric cancer may include the following features:
Pathologic peritoneal and pleural effusions
Obstruction of the gastric outlet, gastroesophageal junction, or small bowel
Bleeding in the stomach from esophageal varices or at the anastomosis after surgery
Intrahepatic jaundice caused by hepatomegaly
Inanition from starvation or cachexia of tumor origin
See Clinical Presentation for more detail.
The goal of obtaining laboratory studies is to assist in determining optimal therapy. Potentially useful tests in patients with suspected gastric cancer include the following:
CBC: May be helpful to identify anemia, which may be caused by bleeding, liver dysfunction, or poor nutrition; approximately 30% of patients have anemia
Liver function tests
Tumor markers such as CEA and CA 19-9: Elevated CEA in 45-50% of cases; elevated CA 19-9 in about 20% of cases
Imaging studies that aid in the diagnosis of gastric cancer in patients in whom the disease is suggested clinically include the following:
Esophagogastroduodenoscopy (EGD): To evaluate gastric wall and lymph node involvement
Double-contrast upper GI series and barium swallows: May be helpful in delineating the extent of disease when obstructive symptoms are present or when bulky proximal tumors prevent passage of the endoscope to examine the stomach distal to an obstruction
Chest radiography: To evaluate for metastatic lesions
CT scanning or MRI of the chest, abdomen, and pelvis: To assess the local disease process and evaluate potential areas of spread
Endoscopic ultrasonography (EUS): Staging tool for more precise preoperative assessment of the tumor stage
Biopsy of any ulcerated lesion should include at least six specimens taken from around the lesion because of variable malignant transformation. In selected cases, endoscopic ultrasonography may be helpful in assessing depth of penetration of the tumor or involvement of adjacent structures.
Histologically, the frequency of different gastric malignancies is as follows :
Adenocarcinoma - 90-95%
Lymphomas - 1-5%
Gastrointestinal stromal tumors (formerly classified as either leiomyomas or leiomyosarcomas) - 2%
Carcinoids - 1%
Adenoacanthomas - 1%
Squamous cell carcinomas - 1%
See Workup for more detail.
The surgical approach in gastric cancer depends on the location, size, and locally invasive characteristics of the tumor.
Types of surgical intervention in gastric cancer include the following:
Total gastrectomy, if required for negative margins
Esophagogastrectomy for tumors of the cardia and gastroesophageal junction
Subtotal gastrectomy for tumors of the distal stomach
Lymph node dissection: Controversy exists regarding extent of dissection; the National Comprehensive Cancer Network (NCCN) recommends D2 dissections over D1 dissections; a pancreas- and spleen-preserving D2 lymphadenectomy provides greater staging information and may provide a survival benefit while avoiding its excess morbidity when possible 
Antineoplastic agents and combinations of agents used in managing gastric cancer include the following:
Platinum-based combination chemotherapy: First-line regimens include epirubicin/cisplatin/5-FU or docetaxel/cisplatin/5-FU; other regimens include irinotecan and cisplatin; other combinations include oxaliplatin and irinotecan
Trastuzumab in combination with cisplatin and capecitabine or 5-FU: For patients who have not received previous treatment for metastatic disease
Ramucirumab for the treatment of advanced stomach cancer or gastroesophageal (GE) junction adenocarcinoma in patients with unresectable or metastatic disease following therapy with a fluoropyrimidine- or platinum-containing regimen
Neoadjuvant, adjuvant, and palliative therapies
Potentially useful therapies in gastric cancer include the following:
Intraoperative radiotherapy (IORT)
Adjuvant chemotherapy (eg, 5-FU)
Palliative-intent procedures (eg, wide local excision, partial gastrectomy, total gastrectomy, simple laparotomy, gastrointestinal anastomosis, bypass)
See Treatment for more detail.
Gastric cancer was once the second most common cancer in the world. In most developed countries, however, rates of stomach cancer have declined dramatically over the past half century. In the United States, stomach malignancy is currently the 15th most common cancer.
Decreases in gastric cancer have been attributed in part to widespread use of refrigeration, which has had several beneficial effects: increased consumption of fresh fruits and vegetables; decreased intake of salt, which had been used as a food preservative; and decreased contamination of food by carcinogenic compounds arising from the decay of unrefrigerated meat products. Salt and salted foods may damage the gastric mucosa, leading to inflammation and an associated increase in DNA synthesis and cell proliferation. Other factors likely contributing to the decline in stomach cancer rates include lower rates of chronic Helicobacter pylori infection, thanks to improved sanitation and use of antibiotics, and increased screening in some countries.
Nevertheless, gastric cancer remains difficult to cure in Western countries, primarily because most patients present with advanced disease. Even patients who present in the most favorable condition and who undergo curative surgical resection often die of recurrent disease. However, two studies have demonstrated improved survival with adjuvant therapy: a US study using postoperative chemoradiation and a European study using preoperative and postoperative chemotherapy.
Management of stomach cancer requires a thorough understanding of gastric anatomy. An image depicting stomach anatomy can be seen below.
The stomach begins at the gastroesophageal junction and ends at the duodenum. The stomach has three parts: the uppermost part is the cardia; the middle and largest part is the body, or fundus; and the distal portion, the pylorus, connects to the duodenum. These anatomic zones have distinct histologic features. The cardia contains predominantly mucin-secreting cells. The fundus contains mucoid cells, chief cells, and parietal cells. The pylorus is composed of mucus-producing cells and endocrine cells.
The stomach wall is made up of five layers. From the lumen out, the layers are as follows:
Externally, the peritoneum of the greater sac covers the anterior surface of the stomach. A portion of the lesser sac drapes posteriorly over the stomach. The gastroesophageal junction has limited or no serosal covering.
The right portion of the anterior gastric surface is adjacent to the left lobe of the liver and the anterior abdominal wall. The left portion of the stomach is adjacent to the spleen, the left adrenal gland, the superior portion of the left kidney, the ventral portion of the pancreas, and the transverse colon.
The site of stomach cancer is classified on the basis of its relationship to the long axis of the stomach. Approximately 40% of cancers develop in the lower part, 40% in the middle part, and 15% in the upper part; 10% involve more than one part of the organ. Most of the decrease in gastric cancer incidence and mortality in the United States has involved cancer in the lower part of the stomach; the incidence of adenocarcinoma in the cardia has actually shown a gradual increase.
Ooi et al identified three oncogenic pathways that are deregulated in the majority (>70%) of gastric cancers: the proliferation/stem cell, NF-kappaβ, and Wnt/beta-catenin pathways. Their study suggests that interactions between these pathways may play an important role in influencing disease behavior and patient survival.
The intestinal type of non-cardia gastric cancer is generally thought to arise from Helicobacter pylori infection, which initiates a sequence that progresses from chronic non-atrophic gastritis to atrophic gastritis, then intestinal metaplasia, and finally dysplasia. This progression is known as Correa’s cascade. In a population-based cohort study, Swedish researchers found that after a 2-year latency, patients with precancerous gastric lesions were at higher risk for gastric cancer than the general Swedish population, and that risk increased steadily with progression through Correa’s cascade. The researchers estimated that the 20-year gastric cancer risk in patients with particular gastroscopy findings was as follows :
Normal mucosa – One in 256
Gastritis – One in 85
Atrophic gastritis – One in 50
Intestinal metaplasia – One in 39
Dysplasia – One in 19
Hematogenous and lymphatic spread
Understanding the vascular supply of the stomach allows understanding of the routes of hematogenous spread. The vascular supply of the stomach is derived from the celiac artery. The left gastric artery, a branch of the celiac artery, supplies the upper right portion of the stomach. The common hepatic artery branches into the right gastric artery, which supplies the lower portion of the stomach, and the right gastroepiploic branch, which supplies the lower portion of the greater curvature.
Understanding the lymphatic drainage can clarify the areas at risk for nodal involvement by cancer. The lymphatic drainage of the stomach is complex. Primary lymphatic drainage is along the celiac axis. Minor drainage occurs along the splenic hilum, suprapancreatic nodal groups, porta hepatis, and gastroduodenal areas.
The American Cancer Society estimates that 24,590 cases of stomach cancer (15,540 in men and 9,050 in women) will be diagnosed in 2015. Median age at diagnosis is 69 years. Gastric cancer is the 15th most common cancer in the US.
Once the second most common cancer worldwide, stomach cancer has dropped to fourth place, after cancers of the lung, breast, and colon and rectum. However, stomach cancer remains the third most common cause of death from cancer. The World Health Organization estimates that in 2012, gastric cancer accounted for 723,000 deaths worldwide.
Tremendous geographic variation exists in the incidence of this disease around the world. Rates of the disease are highest in Asia and parts of South America and lowest in North America. The highest death rates are recorded in Chile, Japan, South America, and the former Soviet Union.
In the United States, gastric cancer represents 1.5% of all new cancer cases but 1.8% of cancer deaths. The overall 5-year relative survival rate, which was 14.3% in 1975, rose to 29.3% by 2006-2011. The 5-year observed survival rate for surgically treated gastric cancer ranges from 71% for patients with stage IA disease to 46% for stage IIA, 20% for stage IIIA, to 4% for stage IV.
The rates of gastric cancer are higher in Asian and South American countries than in the United States; in Japan, for example, stomach cancer is the most common cancer site in males. Japan, Chile, and Venezuela have developed a very rigorous early screening program that detects patients with early-stage disease (ie, low tumor burden). These patients appear to do quite well. In fact, in many Asian studies, patients with resected stage II and III disease tend to have better outcomes than similarly staged patients treated in Western countries. Some researchers suggest that this reflects a fundamental biologic difference in the disease as it manifests in Western countries.
In the United States, the incidence of stomach cancer in males is highest in blacks, followed by Asians and Pacific Islanders, Hispanics, and American Indian/Alaska natives. In females, rates are highest in Asians and Pacific Islanders, followed by blacks and Hispanics and American Indian/Alaska natives. In both males and females, rates are lowest in whites.
In the United States, gastric cancer affects slightly more men than women; the American Cancer Society estimates that in 2015, 15,540 new cases will be diagnosed in men and 9,050 in women. Worldwide, however, gastric cancer rates are about twice as high in men as in women.
Most patients are elderly at diagnosis. The median age for gastric cancer in the United States is 69 years; fewer than 2% of cases occur in persons younger than 35 years. The gastric cancers that occur in younger patients may represent a more aggressive variant or may suggest a genetic predisposition to development of the disease.
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