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In previous works, we have shown that insulin‐like growth factor‐binding protein‐3 (IGFBP‐3), a tissue and circulating protein able to bind to IGFs, decreases drastically in the blood serum of patients with diffuse metastatic melanoma. In agreement with the clinical data, recombinant IGFBP‐3 was found to inhibit the motility and invasiveness of cultured metastatic melanoma cells and to prevent growth...