Following are the different types of stomach cancer.

1. Adenocarcinomas are the most prevalent type of stomach cancer. They grow in the inner lining of the stomach.

2. Lymphomas are immune-system malignancies that can arise anywhere in the lymphatic system. Stomach lymphomas are uncommon, accounting for only 4% of stomach malignancies.

3. Gastrointestinal cancers begin in the stomach's hormone-producing cells. The interstitial cells of Cajal are an uncommon kind of stomach cancer (ICCs). GIST cells resemble muscle nerve cells when seen under a microscope. They can appear anywhere in the digestive tract, although the stomach accounts for 60 to 70% of all cases.

4. Carcinoid tumours start in the stomach's hormone-producing cells. They occur in 3% of the population. They are divided into three categories:

  • ECL-cell carcinoids of type I and II rarely spread and remain in place. They're also asymptomatic, and they could be identified during an endoscopy for another reason, like acid reflux.
  • ECL-cell carcinoids of type III are the most aggressive, necessitating more rigorous therapy. Carcinoid syndrome is characterised by flushing, abdominal pain, diarrhoea, the formation of bronchial tubes in the lungs, and heart abnormalities such as valve failure due to increased hormone release by carcinoid tumours.

Less common stomach tumours might start in the stomach. And the tests for them differ from those for adenocarcinomas.

  • Sarcomas of the soft tissues, such as gastrointestinal stromal tumours
  • Mucosa-associated lymphoid tissue lymphomas are a type of lymphoma.
  • Carcinoid or neuroendocrine tumours

Gastrointestinal cancer grades

Cancer grades describe how cancer cells appear and how aggressive they are. Oncologists can use the cancer grade to figure out how cancer cells behave and what treatment they need to kill them. Cancer is divided into three categories.

Grade 1 (low-grade) cancer has a similar appearance to normal cells.

Grade 2 cancer cells have a modest resemblance to normal cells.

Grade 3 cells don’t bear resemblance to normal cells.