title: Immunosuppressive factors in the tumor environment: Potential implications for immune-based therapies.
authors: Northwest Biotherapeutics Inc, 21720 23rd Drive SE, Suite 100, Bothell, WA 98021, USA. mls@nwbio.com
authors: J A
authors: JA
authors: McEarchern
authors: M L
authors: ML
authors: Salgaller