Table 3

Sentinel lymph node detection rates (A) and negative predictive values (B) for groups 1 and 2

Number of women and groinsDetection rateFalse negative SLNSensitivityNegative predictive value
Per womenPer groinResult of SLN biopsySLN metastasisN% (95% CI)% (95% CI)
Group 1100%84.1%Negative4000100100
 36 womenPositive018(81.5 to 100)(91.2 to 100)
 69 groinsSuccessful mapping: 58 groins
Group 294.1%85.3%Negative2100100100
 17 womenPositive08(63.1 to 100)(83.9 to 100)
 34 groinsSuccessful mapping: 29 groins
  • Group 1, tumors ≥4 cm; group 2, multifocal tumors. Group 3 (local recurrence without previous inguinofemoral lymphadenectomy) and group 4 (local recurrence with previous inguinofemoral lymphadenectomy) were excluded from the analysis (sensitivity and negative predictive value cannot be calculated as only SLN biopsy without inguinofemoral lymphadenectomy was performed).

  • SLN, sentinel lymph node.