What do systematic reviews say?

SLNB vs observation

SLNB may leads to lower rate of pathologically confirmed locoregional recurrence following… compared with observation (low certainty).

• Sentinel lymph node biopsy followed by lymph node dissection for localised primary cutaneous melanoma 2015 · Cochrane Headline outcomes only
  RR 0.56 [0.45, 0.69]
  1 study · 1661 participants
  Low