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Table 4 FNR comparison before and after PLN sampling

From: Prospective study found that peripheral lymph node sampling reduced the false-negative rate of sentinel lymph node biopsy for breast cancer

No. of SLNs No. of patients FNR of SLNB (%) χ2 value P value
Before PLN sampling After PLN sampling
N = 1 158 19.6 4.3 5.059 0.024
N = 2 172 9.8 4.9 0.480 0.488
N = 3 130 7.3 4.9 <0.001 1.000
N ≥ 4 107 2.3 2.3 <0.001 1.000
Total 567 9.9 4.2 4.822 0.028
  1. Abbreviations: FNR false-negative rate, PLN peripheral lymph node, SLNB sentinel lymph node biopsy, SLN sentinel lymph node, N number of SLNs