title: Not so lonely at the top for cancer stem cells.
abstract: A subpopulation of cancer cells is believed to be responsible for tumor initiation, propagation, and metastasis. In this issue of Cell Stem Cell, Dieter et al. (2011) show that these functions in colon cancer can be ascribed to distinct tumor-initiating cell populations.
authors: Department of Hematology, Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome, Italy.
authors: Ann
authors: A
authors: Zeuner
authors: Ruggero
authors: R
authors: De Maria