Horace Jones had a colonoscopy shortly after his 50th birthday, and the gastroenterologist noticed an unusual mass of tissue in the region of the sigmoid colon. Subsequent tests and surgery revealed that the mass was malignant, having invaded the submucosal and muscularis layers of the colon. Biopsy of regional lymph nodes was positive, with 2 nodes showing tumor cells. What kind of cancer does Mr. Jones have, and what Stage is his cancer? If you looked at a tissue slide, what are the likely differences in appearance between tumor cells from his cancer and normal cells from other parts of the colon?