Paper Chase is a research database designed to offer abstracts of research articles published in journals that have a highly rated impact factor as determined by ISI Impact Factor and PageRank. Abstracts are organized by date, with the most recently published papers listed first. 

Paper Chase

Cancer: Clonal cooperation.

Nature. Apr 03, 2014;508(7494):52-3.
Polyak K, Marusyk A.

Department of Medical Oncology, Dana-Farber Cancer Institute, and the Department of Medicine, Harvard Medical School, Boston, Massachusetts 02115, USA.