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

**Semantic type:** Neoplastic Process

**Definition:** Stage IIIA includes: (T1, N0, M0, High Mitotic Rate); (T4, N0, M0, Low Mitotic Rate). T1: Tumor measuring 2 cm or less. T4: Tumor measuring more than 10 cm in greatest dimension. N0: No regional lymph node metastasis or unknown lymph node status. M0: No distant metastasis. High Mitotic Rate: Over 5 mitoses per 5 square millimeters, or per 50 HPF. Low Mitotic Rate: Five or fewer mitoses per 5 square millimeters, or per 50 HPF. (AJCC 8th ed.)

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