Stomach cancer, also known as gastric cancer, begins in the lining of the stomach. It can develop in any part of the stomach and may spread to other parts of the digestive system or body. Stomach cancer often starts in the cells lining the stomach, and it can grow slowly over time. The prognosis and treatment depend on the stage of the disease at diagnosis, among other factors.

Types of Stomach Cancer

Adenocarcinoma: The most common type of stomach cancer, accounting for about 90-95% of cases. It starts in the mucus-producing cells lining the stomach. There are several subtypes, including:

• Intestinal Type: Resembles intestinal tissue and is often associated with pre-existing conditions like chronic gastritis.
• Diffuse Type: Characterized by cancer cells that spread throughout the stomach wall, leading to thickening of the stomach wall and a more diffuse growth pattern.

Gastrointestinal Stromal Tumor (GIST): A rare type of tumor that originates in the connective tissue cells of the stomach. GISTs may be benign or malignant.

Lymphoma: Stomach lymphoma arises from lymphoid tissue in the stomach. It is typically associated with chronic inflammation, such as that caused by Helicobacter pylori infection.

Carcinoid Tumor: A rare type of cancer that begins in hormone-producing cells of the stomach. It is typically slow-growing.

Symptoms

Symptoms of stomach cancer can be vague and may resemble those of other stomach conditions. Common symptoms include:

• Abdominal Pain or Discomfort: Often in the upper abdomen.
• Indigestion or Nausea: Persistent or severe.
• Loss of Appetite: Reduced desire to eat.
• Unexplained Weight Loss: Significant loss of weight without a clear cause.
• Vomiting: Sometimes with blood or material that looks like coffee grounds.
• Difficulty Swallowing: Especially if the cancer is near the esophagus.
• Feeling Full Quickly: Feeling full after eating only a small amount of food.
• Abdominal Swelling: Fluid accumulation in the abdomen (ascites).

Risk Factors

• Helicobacter pylori Infection: Chronic infection with this bacterium is a known risk factor for stomach cancer.
• Family History: A family history of stomach cancer can increase risk.
• Genetic Conditions: Certain inherited conditions, like hereditary diffuse gastric cancer syndrome (associated with BRCA2 mutations) and Lynch syndrome, increase risk.
• Diet: High consumption of salty, smoked, or pickled foods, and low intake of fruits and vegetables may increase risk.
• Smoking: Tobacco use is linked to an increased risk of stomach cancer.
• Age and Gender: More common in older adults and slightly more common in men.
• Previous Stomach Surgery: Surgery for benign conditions may slightly increase risk.
• Chronic Gastritis: Long-term inflammation of the stomach lining.

Diagnosis

• Endoscopy: A procedure where a flexible tube with a camera (endoscope) is inserted through the mouth to visualize the stomach lining and take biopsies if needed.
• Biopsy: Tissue samples taken during endoscopy are examined under a microscope to confirm the presence of cancer cells.
• Imaging Tests: CT scans, PET scans, and sometimes MRIs are used to determine the extent of the disease and check for metastasis.
• Blood Tests: Although not used to diagnose stomach cancer directly, blood tests can help assess overall health and detect anemia or other abnormalities.

Treatment

Treatment depends on the cancer's stage, location, and type, as well as the patient's overall health. Options may include:

Surgery: The primary treatment for localized stomach cancer. This may involve:

• Gastrectomy: Partial or total removal of the stomach, depending on the tumor's location and extent.
• Lymph Node Removal: Removal of nearby lymph nodes if cancer has spread to them.

Chemotherapy: Uses drugs to kill cancer cells or shrink tumors. It is often used in combination with surgery or as the primary treatment for advanced cancers.

Radiation Therapy: Uses high-energy rays to target and kill cancer cells. It is less commonly used for stomach cancer but may be used to manage symptoms or in combination with other treatments.

Targeted Therapy: Uses drugs that specifically target cancer cells or their growth pathways, such as HER2 inhibitors for cancers with HER2 gene amplification.

Immunotherapy: Uses medications to help the body's immune system recognize and attack cancer cells. This is more commonly used in specific cases, often based on tumor genetics and biomarkers.

Prognosis

The prognosis for stomach cancer depends on various factors, including the stage at diagnosis, the cancer type, and how well it responds to treatment. Early-stage stomach cancer generally has a better prognosis compared to more advanced stages. Advances in treatment and early detection strategies continue to improve outcomes for many patients.

If you have symptoms or risk factors for stomach cancer, consulting a healthcare provider for evaluation and appropriate diagnostic testing is important for timely diagnosis and management.