title: Featuring the guest editors: Special issue tumor microenvironment.
authors.affiliation: Stem Cell Regulation and Animal Aging Section, Basic Research Laboratory, National Cancer Institute, Frederick, MD 21702, USA. Electronic address: singhshr@mail.nih.gov.
authors.forename: Shree Ram
authors.initials: SR
authors.lastname: Singh
authors.affiliation: Division of Hematology and Oncology, New Jersey Medical School (NJMS)-Rutgers, Newark, NJ 07103, USA. Electronic address: rameshwa@njms.rutgers.edu.
authors.forename: Pranela
authors.initials: P
authors.lastname: Rameshwar
authors.affiliation: Department of Medicine, Biochemistry, Anatomy & Cell Biology and Oncology, Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, Canada. Electronic address: peter.siegel@mcgill.ca.
authors.forename: Peter
authors.initials: P
authors.lastname: Siegel