We examined the expression of INPP4B in relation to melanoma development and progression by immunohistochemistry (IHC) in tissue microarrays (TMAs) constructed from 100 formalin-fixed paraffin-embedded (FFPE) melanocytic tumours using an antibody against INPP4B that had been used for similar studies in other types of tissues (Supplementary Table 1) [26, 32]. Here, INPP4B is linked to melanoma.