p21(waf1/cip1) and transforming growth factor β1 protein expression correlate with survival in non-small cell lung cancer

William P. Bennett, Wafik S. El-Deiry, Walter L. Rush, Donald G. Guinee, Andrew N. Freedman, Neil E. Caporaso, Judith A. Welsh, Raymond T. Jones, Andrew Borkowski, William D. Travis, Marian V. Fleming, Victor Trastek, Peter C. Pairolero, Henry D. Tazelaar, David Midthun, James R. Jett, Lance A. Liotta, Curtis C. Harris