Provided herein are methods of treating a subject with cancer comprising administering to the subject a death receptor agonist. Also provided herein are methods of screening a breast cancer cell for responsiveness to a DR5 agonist. Further provided herein are antibodies that selectively bind an N-terminal CARD of DDX3, a DDX3 lacking an N-terminal CARD, and an 80 kDa baculovirus TAP repeat (BIR).
