Cancer Genetics and Epigenetics, Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, CRB1, Baltimore, Maryland, USA

Correspondence to Hariharan Easwaran, Cancer Genetics and Epigenetics, Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, CRB1 Rm530, 1650 Orleans Street, Baltimore, MD 21287, USA. Tel: +1 410 955 8506; fax: +1 410 614 9884; e-mail: [email protected]