Combination therapy comprising a MEK inhibitor, a PD-1 or PD-L1 inhibitor, and a taxane for the treatment of cancer such as triple negative breast cancer is provided. [Selection] Figure 1Aトリプルネガティブ乳がんのようながんの治療のための、MEK阻害剤、PD-1又はPD-L1阻害剤、及びタキサンを含む併用療法が提供される。【選択図】図1A