The instant invention relates to methods for the treatment of WEE1 kinase associated cancer by administering a WEE1 inhibitor, wherein the WEE1 inhibitor is WEE1-1 or a pharmaceutically acceptable salt thereof, or WEE1-2 or a pharmaceutically acceptable salt thereof. In another embodiment, the invention relates to a method for treating a WEE1 kinase associated cancer patient, comprising administering a WEE1 inhibitor, wherein the cancer cells of said patient to be treated are characterized by low expression levels of PKMYT1.