For uterine sarcoma, NCCN recommends chest Xray or CT every 6-12 months as necessary for up to 5 years.
Routine surveillance intervals are typically every 3-4 months for the first 2 years, since 85% of recurrences occur in the first 2 years after diagnosis. Intervals are every 6 months for the next 3 years and annually thereafter. Each visit should include a pelvic examination, a Papanicolaou test, and a lymph node survey. Chest radiographs may be taken annually. CA-125 levels are helpful if they were elevated preoperatively in advanced-stage cancers. Most recurrences are discovered during evaluation of symptomatic patients. Most recurrences in early-stage disease are at the vaginal cuff and pelvis.
Fung-Kee-Fung M, Dodge J, Elit L, Lukka H, Chambers A, Oliver T. Follow-up after primary therapy for endometrial cancer: a systematic review. Gynecol Oncol. Jun 2006;101(3):520-9.
P.G.Casali et al, Soft tissue sarcomas: ESMO Clinical Recommendations for diagnosis, treatment and follow-up Ann Oncol (2009) 20 (suppl 4): iv132-iv136.