Intramucosal andenocarcinoma. Benign?.

Good evening Doctor. I had intramucosal adenocarcinoma of the rectum about 9 years ago, arising from a tubulovillous adenoma (2 × 2 cm), moderately differentiated, with no invasion beyond the muscularis mucosa. Only polypectomy was done, and no further treatment was required. The report showed MSI negative / MMR proficient. At that time MRI pelvis and CT scan were normal, and post-polypectomy site biopsy showed no dysplasia or malignancy. Follow-up done regularly: • Colonoscopy – about 10 times, all normal (last on 12 November 2025) • USG whole abdomen – 10 times, all normal • Blood tests – about 6 times, normal • Chest X-ray (PA) – 4 times, normal Kindly advise the appropriate interval for future surveillance colonoscopy. Also, if a new polyp appears in future, would it necessarily be malignant in my case, or usually benign? . Kindly send your advice by SMS when convenient. Thank you.