The types of gastric cancer are further categorized into the following forms, on the basis of the different parts of the stomach, type of cells, and how these cells spread to other areas of the body.
Adenocarcinoma is the most common type of gastric cancer among all. It affects the innermost lining of the stomach (mucosa) due to which abnormal growth of gastric cells are observed.
This type of cancer affects the tissue of an immune system that is present in the wall of the stomach. Later on, the cells in the tissues form a cancerous cell lump over there.
Gastrointestinal Stromal Tumour (GIST)
It is the rare type of tumour which results from the impaired growth of interstitial cells named as Cajal. These cells are located on the wall of the stomach. It can affect anywhere in the digestive tract but mostly in the stomach. GIST tumours are either benign or malignant.
These types of tumours begin to stimulate hormone-making cells of the stomach. They are mostly benign, means; do not spread to other parts of the body.
Other types of cancer, such as squamous cell carcinoma, small cell carcinoma, and leiomyosarcoma, can also cause stomach cancer. These cancers rarely exist.