Provided are a cancer therapeutic drug comprising a compound which inhibits GPX4 as an active ingredient, the cancer therapeutic drug treating cancer containing a cancer cell having a suppressed function of a SWI/SNF complex factor detected; and a method for predicting sensitivity of a cancer cell to a GPX4 inhibitor, the method comprising the step of predicting a cancer cell having a suppressed function of a SWI/SNF complex factor detected in the cancer cell, as having sensitivity to the GPX4 inhibitor.

Provided herein are compounds, compositions, and methods that increase the infiltration of tumor cell microenvironments by immune cells. Such methods are useful for enhancing a subject's immune response against the tumor.