Keefer LK - Search Results

1

Quantitative measurement of endogenous estrogens and estrogen metabolites in human serum by liquid chromatography-tandem mass spectrometry.

Xu X, Roman JM, Issaq HJ, Keefer LK, Veenstra TD, Ziegler RG. Xu X, et al. Among authors: keefer lk. Anal Chem. 2007 Oct 15;79(20):7813-21. doi: 10.1021/ac070494j. Epub 2007 Sep 12. Anal Chem. 2007. PMID: 17848096

2

A liquid chromatography-mass spectrometry method for the simultaneous measurement of 15 urinary estrogens and estrogen metabolites: assay reproducibility and interindividual variability.

Falk RT, Xu X, Keefer L, Veenstra TD, Ziegler RG. Falk RT, et al. Cancer Epidemiol Biomarkers Prev. 2008 Dec;17(12):3411-8. doi: 10.1158/1055-9965.EPI-08-0355. Cancer Epidemiol Biomarkers Prev. 2008. PMID: 19064556 Free PMC article.

3

Stable isotope dilution high-performance liquid chromatography-electrospray ionization mass spectrometry method for endogenous 2- and 4-hydroxyestrones in human urine.

Xu X, Ziegler RG, Waterhouse DJ, Saavedra JE, Keefer LK. Xu X, et al. Among authors: keefer lk. J Chromatogr B Analyt Technol Biomed Life Sci. 2002 Nov 25;780(2):315-30. doi: 10.1016/s1570-0232(02)00539-1. J Chromatogr B Analyt Technol Biomed Life Sci. 2002. PMID: 12401358

4

Measuring seven endogenous ketolic estrogens simultaneously in human urine by high-performance liquid chromatography-mass spectrometry.

Xu X, Keefer LK, Waterhouse DJ, Saavedra JE, Veenstra TD, Ziegler RG. Xu X, et al. Among authors: keefer lk. Anal Chem. 2004 Oct 1;76(19):5829-36. doi: 10.1021/ac049405i. Anal Chem. 2004. PMID: 15456304

5

Measuring fifteen endogenous estrogens simultaneously in human urine by high-performance liquid chromatography-mass spectrometry.

Xu X, Veenstra TD, Fox SD, Roman JM, Issaq HJ, Falk R, Saavedra JE, Keefer LK, Ziegler RG. Xu X, et al. Among authors: keefer lk. Anal Chem. 2005 Oct 15;77(20):6646-54. doi: 10.1021/ac050697c. Anal Chem. 2005. PMID: 16223252

6

A liquid chromatography-mass spectrometry method for the quantitative analysis of urinary endogenous estrogen metabolites.

Xu X, Keefer LK, Ziegler RG, Veenstra TD. Xu X, et al. Among authors: keefer lk. Nat Protoc. 2007;2(6):1350-5. doi: 10.1038/nprot.2007.176. Nat Protoc. 2007. PMID: 17545972

7

Comparison of liquid chromatography-tandem mass spectrometry, RIA, and ELISA methods for measurement of urinary estrogens.

Faupel-Badger JM, Fuhrman BJ, Xu X, Falk RT, Keefer LK, Veenstra TD, Hoover RN, Ziegler RG. Faupel-Badger JM, et al. Among authors: keefer lk. Cancer Epidemiol Biomarkers Prev. 2010 Jan;19(1):292-300. doi: 10.1158/1055-9965.EPI-09-0643. Cancer Epidemiol Biomarkers Prev. 2010. PMID: 20056650 Free PMC article.

8

Assay reproducibility and interindividual variation for 15 serum estrogens and estrogen metabolites measured by liquid chromatography-tandem mass spectrometry.

Fuhrman BJ, Xu X, Falk RT, Dallal CM, Veenstra TD, Keefer LK, Graubard BI, Brinton LA, Ziegler RG, Gierach GL. Fuhrman BJ, et al. Among authors: keefer lk. Cancer Epidemiol Biomarkers Prev. 2014 Dec;23(12):2649-57. doi: 10.1158/1055-9965.EPI-14-0438. Cancer Epidemiol Biomarkers Prev. 2014. PMID: 25472673 Free PMC article.

9

A new approach to measuring estrogen exposure and metabolism in epidemiologic studies.

Ziegler RG, Faupel-Badger JM, Sue LY, Fuhrman BJ, Falk RT, Boyd-Morin J, Henderson MK, Hoover RN, Veenstra TD, Keefer LK, Xu X. Ziegler RG, et al. Among authors: keefer lk. J Steroid Biochem Mol Biol. 2010 Aug;121(3-5):538-45. doi: 10.1016/j.jsbmb.2010.03.068. Epub 2010 Apr 9. J Steroid Biochem Mol Biol. 2010. PMID: 20382222 Free PMC article. Review.

10

Stability of 15 estrogens and estrogen metabolites in urine samples under processing and storage conditions typically used in epidemiologic studies.

Fuhrman BJ, Xu X, Falk RT, Hankinson SE, Veenstra TD, Keefer LK, Ziegler RG. Fuhrman BJ, et al. Among authors: keefer lk. Int J Biol Markers. 2010 Oct-Dec;25(4):185-94. Int J Biol Markers. 2010. PMID: 21161939 Free PMC article.

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