Clinical Cancer Research CR Balducci Advances in Breast Cancer
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Clinical Cancer Research Vol. 5, 2103-2107, August 1999
© 1999 American Association for Cancer Research

Molecular Oncology, Markers, Clinical Correlates

The Human Orphan Receptor PXR Messenger RNA Is Expressed in Both Normal and Neoplastic Breast Tissue1

Helmut Dotzlaw, Etienne Leygue, Peter Watson and Leigh C. Murphy2

Departments of Biochemistry and Molecular Biology [H. D., E. L., L. C. M.] and Pathology [P. W.], University of Manitoba, Winnipeg, Manitoba, Canada R3E 0W3

The expression of PXR mRNA and a variant PXR mRNA, deleted in 111 nucleotides in the ligand-binding domain, was detected by reverse transcription-PCR amplification in both normal and neoplastic human breast tissues. The level of PXR mRNA did not differ between breast tumors and their adjacent matched normal breast tissues. However, the expression of PXR mRNA did vary among breast tumors. A statistically significant inverse relationship was found between the level of PXR mRNA expression and estrogen receptor (ER) status, as defined by ligand binding analysis. The level of PXR mRNA expression in ER+ tumors (median = 22.4, n = 15) was significantly lower (P = 0.04) than the level of PXR mRNA expression in ER- tumors (median = 46.7, n = 15). No relationship with progesterone receptor status was found. These data raise the possibility that PXR has a role in human breast tissues.




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Copyright © 1999 by the American Association for Cancer Research.