We examined the effects of MK2206 on thyroid cancer cells with respect to the genotypes of the PI3K/Akt pathway....The SW1736 cell, lacking mutations in the PI3K/Akt pathway, had minimal response to MK2206, but transfection with exogenous PIK3CA mutants, PIK3CA H1047R and E545K, significantly increased its sensitivity to MK2206.