• Research on the interactions between natural and social systems, and with how those interactions affect the challenge of sustainability.
  • Science Sessions: The PNAS Podcast Program
February 21, 2012; 109 (8)

Cover image

Cover image expansion

Cover image: An artistic rendition of combined immunofluorescence and FISH images of a breast tumor shows the antigens CD44 (blue) and CD24 (yellow), chromosome segment 8q24 (red), and the centromere of chromosome 8 (green). Kornelia Polyak and Peter K. Vogt present an overview of progress in major areas of current breast cancer research, including results that might lead to improved treatment outcomes for patients. See the introduction to the Breast Cancer Special Feature on pages 2715–2717. Image courtesy of Vanessa Almendro (Dana-Farber Cancer Institute, Harvard Medical School, Boston).

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