Someone recently pointed me to an article on "Clone Wars" in oncology and the genomic evolution of tumors.
The term has some history. That are about ten hits on PubMed specific to "Clone Wars" in oncology, and they date back to 2006. A search for oncology + cancer + "clone wars" on Google pulls up additional hits, such as a 2013 webpage at MD Anderson (here), and a deck by ASU's George Poste (here).
For the most prominent recent article, see Beltran's article The Clone Wars in Science Translation Medicine in February 2017 (here). For an open access example, see Worsley et al. 2016 (here).
More examples after the break.