Stage I Small Intestinal, Esophageal, Colorectal, Mesenteric, and Peritoneal Gastrointestinal Stromal Tumor AJCC v8

**Semantic type:** Neoplastic Process

**Definition:** Stage I includes: T1 or T2, N0, M0, Low Mitotic Rate. T1: Tumor measuring 2 cm or less. T2: Tumor measuring more than 2 cm but not more than 5 cm. N0: No regional lymph node metastasis or unknown lymph node status. M0: No distant metastasis. Low Mitotic Rate: Five or fewer mitoses per 5 square millimeters, or per 50 HPF. (AJCC 8th ed.)

**Synonyms:** - Stage I Small Intestinal, Esophageal, Colorectal, Mesenteric, and Peritoneal GIST AJCC v8 - Stage I Small Intestinal, Esophageal, Colorectal, Mesenteric, and Peritoneal Gastrointestinal Stromal Tumor (GIST)