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Backes, F.J.; Felix, A.S.; Plante, M.; Grégoire, J.; Sullivan, S.A.; Rossi, E.C.; Tanner, E.J.; Stewart, K.I.; Soliman, P.T.; Holloway, R.W.; Abu-Rustum, N.R.; Leitao, M.M.
Gynecologic oncology, 05/2021, Volume: 161, Issue: 2Journal Article
To assess associations between treatment and recurrence-free survival (RFS) among patients with isolated tumor cells (ITCs) in sentinel lymph nodes (SLN) and otherwise stage I/II endometrioid endometrial cancer (EC). A multi-institutional retrospective study of patients with SLN ITCs (<200 cells and < 0.2 mm) was performed. Only patients with otherwise stage I/II EC, endometrioid histology, and no evidence of micro-or macrometastases were included. Univariate and multivariable Cox proportional hazard models were used to evaluate associations between treatment, tumor characteristics, and RFS. 175 patients were included. Median follow up time was 31 months. 39% stage IB and 12% stage II disease. 76 (43%) received no adjuvant therapy or vaginal brachytherapy only (NAT/VBT), 21 (12%) had external beam radiation (EBRT), and 78 (45%) received chemotherapy +/− radiation. Patients who received chemotherapy more often had tumors with deep myoinvasion, lymphovascular space invasion (LVSI), and higher grade. Nine (5.1%) patients recurred; 5 distant, 3 retroperitoneal, and 1 vaginal. Extra-vaginal recurrences were similar in patients with or without chemotherapy (5.2% vs 3.8%, p = 0.68). After controlling for stage, LVSI and grade, chemotherapy and EBRT were not associated with RFS (HR = 0.63, 95%CI 0.11–3.52, and HR = 0.90, 95%CI 0.22–3.61, respectively). Type of lymph node dissection and ITC detection method were not associated with RFS. Risk of retroperitoneal and/or distant recurrence is low (4.6%) for patients with stage I/II endometrioid EC and ITCs in SLNs regardless of treatment. Our preliminary data suggests that adjuvant therapy may not be significantly associated with RFS. However, longer follow-up time and a larger sample size are needed before definitive recommendations regarding adjuvant therapy for patients with EC and only ITCs in SLN can be made. •This is the largest cohort of stage I/II endometrial cancer and only ITCs in SLN.•Adjuvant therapy may not reduce the risk of recurrence or location of recurrence.•Adjuvant therapy should be based on uterine and/or molecular factors.•ITCs in SLN does not warrant increased utilization and toxicity of adjuvant therapy.
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