ICAM1 and melanoma: Then, three established melanoma cell lines with different ICAM1 expression (C32, high ICAM1 expression, ranking 3/81; SK‐MEL‐1, medium ICAM1 expression, ranking 41/81; A375, medium‐low ICAM1 expression, ranking 67/81) and normal 293T cell line as the ICAM1‐negative control were used to perform in vitro experiments.