The present invention relates to the area of ATG4-related disorders. More particularly, the present invention relates to a method of treating an ATG4B-related disorder comprising a step of administering a subject with an effective amount of tioconazole. The present invention relates also to a method of increasing a subject's responsiveness to a therapy for a cancer comprising inhibition of ATG4B activity in cells; said method comprises administering the subject with an effective amount of tioconazole. The present invention also relates to a method for enhancing or inducing a response in a cancer cell consisting of cytotoxicity, chemosensitivity or starvation-sensitivity; said method comprises administering a subject with an effective amount of tioconazole to inhibit ATG4B's activity.