Gastric Cancer

What is gastric cancer?

Gastric cancer develops from malignant cells in the lining of the stomach, the part of the digestive system which processes nutrients and helps to pass waste material out of the body. The wall of the stomach is made up of 3 layers of tissue: the mucosal (innermost) layer, the muscularis (middle) layer, and the serosal (outermost) layer. Gastric cancer begins in the cells lining the mucosal layer and spreads through the outer layers as it grows1.

How common is gastric cancer?

Stomach cancer was the 5th most diagnosed cancer in 2012, with almost a million new cases, accounting for 6.8% of all cancer cases2.


1. Gastric Cancer Treatment (PDQ®)–Patient Version,
    National Cancer Institute, February 2018
2. Cancer facts & figures – Worldwide data,
World Cancer Research Fund International, 2014

  1. Keytruda (pembrolizumab)
    Keytruda (pembrolizumab)
    by Merck Sharp
    for Urothelial Carcinoma, Gastric Cancer, Head and Neck Cancer, Lung Cancer, Lymphoma, Skin Cancer
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