Stage IIIB Gastric and Omental Gastrointestinal Stromal Tumor AJCC v8

**Semantic type:** Neoplastic Process

**Definition:** Stage IIIB includes: T4, N0, M0, High Mitotic Rate. 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. (AJCC 8th ed.)

**Synonyms:** - Stage IIIB Gastric (Stomach) and Omental Gastrointestinal Stromal Tumor (GIST) - Stage IIIB Gastric and Omental GIST AJCC v8