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NCI Dictionary of Cancer Terms

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NCI Dictionary of Cancer Terms



stage I esophageal squamous cell carcinoma  listen  (... ee-SAH-fuh-JEE-ul SKWAY-mus sel KAR-sih-NOH-muh)

  Stage I is divided into stages IA and IB, depending on where the cancer is found. In stage IA, cancer has formed in the inner (mucosal) layer of the esophageal wall. The tumor cells look a lot like normal cells under a microscope. In stage IB, cancer has formed (1) in the inner (mucosal) layer of the esophageal wall. The tumor cells do not look at all like normal cells under a microscope; or (2) in the inner (mucosal) layer and spread into the middle (muscle) layer or the outer (connective tissue) layer of the esophageal wall. The tumor cells look a lot like normal cells under a microscope. The tumor is in the lower esophagus or it is not known where the tumor is.

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Stage IA squamous cell cancer of the esophagus; drawing shows the esophagus and stomach. An inset shows cancer cells in the mucosa and submucosa layers of the esophagus wall. Also shown are the muscle and connective tissue layers of the esophagus wall and lymph nodes.
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Stage IB squamous cell cancer of the esophagus; drawing shows the  esophagus and stomach. A two-panel inset shows the layers of the esophagus wall: the mucosa, submucosa, muscle, and connective tissue layers. Also shown are lymph nodes. The left panel shows cancer in the mucosa and submucosa layers. The right panel shows cancer in the mucosa, submucosa, and muscle layers.