Low MITF/AXL ratio predicts early resistance to multiple targeted drugs in melanoma. by Müller, J, Krijgsman, O, Tsoi, J, Robert, L, Hugo, W, Song, C, Kong, X, Possik, P, Cornelissen-Steijger, P, Foppen, M, Kemper, K, Goding, C, McDermott, U, Blank, C, Haanen, J, Graeber, T, Ribas, A, Lo, R, Peeper, D