 Plasma exposure of selumetinib Cmax and AUC is higher, at a population level, in subjects of Asian descent by approximately 1.5- to 2-fold in non-Japanese Asians and Japanese subjects, compared with Western subjects. However, there is overlap in the range of exposure experienced by Asian and Western subjects and the higher average plasma exposure was not associated with a change in the tolerability profile of single dose selumetinib. 