There are different types, though the most common and the one we will discuss here is adenocarcinoma.

Adenocarcinoma begins in the gland cells of the mucosa of the stomach.

The less common cancers that can start in the stomach include:

• soft tissue soft tissue sarcomas, including gastrointestinal stromal tumors
• lymphomas, such as mucosa associated lymphoid tissue lymphomas
• carcinoid tumors

The tests and treatments for these types of cancer are different from those that will be discussed below.