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Tumor Biology |
Departments of Medicine [N. C., C. C., C. T., C. L. S.], Molecular Biology Institute [N. C., O. N. W., C. L. S.], Urology [A. B., J. D., R. E. R.], Jonsson Comprehensive Cancer Center [A. B., J. D., O. N. W., J. S., R. E. R., C. L. S.], Microbiology and Molecular Genetics [O. N. W.], Howard Hughes Medical Institute [O. N. W.], and Pathology [J. S.], University of California Los Angeles, Los Angeles, California 90095-1678
Prostate cancers require androgen for growth but progress to an androgen-independent stage under the selective pressure of androgen ablation therapy. Here we describe a novel human prostate cancer xenograft (LAPC-9) propagated by serial passage in male severe combined immunodeficient mice that expresses prostate-specific antigen and wild-type androgen receptor. In response to castration, LAPC-9 cells undergo growth arrest and persist in a dormant, androgen-responsive state for at least 6 months. After prolonged periods of androgen deprivation, spontaneous androgen-independent outgrowths develop. Thus, prostate cancers progress to androgen independence through two distinct stages, initially escaping dependence on androgen for survival and, subsequently, for growth. Through the use of serial dilution and fluctuation analysis, we provide evidence that the latter stage of androgen independence results from clonal expansion of androgen-independent cells that are present at a frequency of about 1 per 105106 androgen-dependent cells. We conclude that prostate cancers contain heterogeneous mixtures of cells that vary in their dependence on androgen for growth and survival and that treatment with antiandrogen therapy provides selective pressure and alters the relative frequency of these cells, thereby leading to outgrowths of androgen-independent cancers.
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D. C. Saffran, A. B. Raitano, R. S. Hubert, O. N. Witte, R. E. Reiter, and A. Jakobovits Anti-PSCA mAbs inhibit tumor growth and metastasis formation and prolong the survival of mice bearing human prostate cancer xenografts PNAS, February 27, 2001; 98(5): 2658 - 2663. [Abstract] [Full Text] [PDF] |
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M. S. Neshat, I. K. Mellinghoff, C. Tran, B. Stiles, G. Thomas, R. Petersen, P. Frost, J. J. Gibbons, H. Wu, and C. L. Sawyers Enhanced sensitivity of PTEN-deficient tumors to inhibition of FRAP/mTOR PNAS, August 28, 2001; 98(18): 10314 - 10319. [Abstract] [Full Text] [PDF] |
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