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At the age of 61 years, since you have already attained menopause, and the possibility of cancer cells growing at a later date, hysterectomy would be a good choice. This will remove the source of cancer entirely.
Unless you have other medical conditions, like diabetes, low lung reserve, cardiovascular limitations for surgery, there is no contraindication for surgery.
Surgical removal of the uterus would be a proper choice. There are no other options better than hysterectomy which can remove the source of cancer.