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A 64-year-old woman underwent laparoscopic sigmoid colectomy for adenocarcinoma. Staging workup was negative for distant metastases. Preoperative carcinoembryonic antigen level was 4.1 ng/mL (4.1 μg/L). Proximal, distal, and radial margins were negative. Which of the following findings on final pathology confers the poorest prognosis?

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