WX8 (Ro 91-4714) is an ATP-competitive PIKFYVE inhibitor, with K d values of 0.9 nM and 340 nM for PIKFYVE and PIP4K2C, respectively. WX8 (Ro 91-4714) inhibits lysosomal fission without effecting homotypic lysosomal fusion. WX8 (Ro 91-4714) is used in the research of autophagy-dependent cancer.