Fig. 3

Stopping rule of SLN procedure. Legend: The stopping rule is activated when the number of groin recurrences (Y as) related to the number of patients with a negative SLN exceeds the line. * see text for all in- and exclusion criteria, **inclusion and exclusion criteria applicable to local tumour, but strong suspicion or evidence of tumour positive lymph nodes (clinical, radiological or proven with fine needle aspiration or biopsy)