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Isolated ipsilateral groin recurrences in patients with SN micrometastases ≤ 2 mm. Radiotherapy versus no further treatment (HR, 0.11; 95% CI, 0.02 to 0.76). Patients who underwent IFL instead of radiotherapy were excluded. HR, hazard ratio; IFL, inguinofemoral lymphadenectomy; SN, sentinel node.
