Entosis, a key player in cancer cell competition.

Cell-in-cell structures, also referred to as 'entosis', are frequently found in human malignancies, although their prognostic impact remains to be defined. Two articles recently published in Cell Research report the stimulation of entosis by one prominent oncogene, Kras, as well as by one class of tumor suppressors, namely epithelial cadherins E and P, illustrating the complex regulation of this biological process.