Abstract

We have recently identified a patient who had a false positive low dose dexamethasone suppression test (DST) that likely resulted from treatment with a new insulin sensitizing agent, troglitazone (Rezulin). Data from clinical studies suggest that troglitazone induces hepatic CYP3A4, the most prevalent drug metabolizing enzyme in the liver and the enzyme that is also responsible for the metabolism of dexamethasone. We suggest that as troglitazone becomes more frequently used and as its indications for use broaden, false positive DST in patients treated with troglitazone will become common. The proposed investigations will establish whether troglitazone does alter DST via an increase in CYP3A4 activity.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
General Clinical Research Centers Program (M01)
Project #
5M01RR000042-40
Application #
6303498
Study Section
Project Start
1999-12-01
Project End
2001-02-28
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
40
Fiscal Year
2000
Total Cost
$206
Indirect Cost

  Institution

Name
University of Michigan Ann Arbor
Department
Type
DUNS #
791277940
City
Ann Arbor
State
MI
Country
United States
Zip Code
48109

  Publications

Robarge, Jason D; Desta, Zereunesay; Nguyen, Anne T et al. (2017) Effects of exemestane and letrozole therapy on plasma concentrations of estrogens in a randomized trial of postmenopausal women with breast cancer. Breast Cancer Res Treat 161:453-461
Crane, Natania A; Jenkins, Lisanne M; Bhaumik, Runa et al. (2017) Multidimensional prediction of treatment response to antidepressants with cognitive control and functional MRI. Brain 140:472-486
Hertz, Daniel L; Speth, Kelly A; Kidwell, Kelley M et al. (2017) Variable aromatase inhibitor plasma concentrations do not correlate with circulating estrogen concentrations in post-menopausal breast cancer patients. Breast Cancer Res Treat 165:659-668
Hertz, D L; Kidwell, K M; Seewald, N J et al. (2017) Polymorphisms in drug-metabolizing enzymes and steady-state exemestane concentration in postmenopausal patients with breast cancer. Pharmacogenomics J 17:521-527
Kadakia, Kunal C; Kidwell, Kelley M; Seewald, Nicholas J et al. (2017) Prospective assessment of patient-reported outcomes and estradiol and drug concentrations in patients experiencing toxicity from adjuvant aromatase inhibitors. Breast Cancer Res Treat 164:411-419
Spengler, Erin K; Kleiner, David E; Fontana, Robert J (2017) Vemurafenib-induced granulomatous hepatitis. Hepatology 65:745-748
Heidemann, Lauren; Law, James; Fontana, Robert J (2017) A Text Searching Tool to Identify Patients with Idiosyncratic Drug-Induced Liver Injury. Dig Dis Sci 62:615-625
Kadakia, Kunal C; Snyder, Claire F; Kidwell, Kelley M et al. (2016) Patient-Reported Outcomes and Early Discontinuation in Aromatase Inhibitor-Treated Postmenopausal Women With Early Stage Breast Cancer. Oncologist 21:539-46
Ricker, Charité; Culver, Julie O; Lowstuter, Katrina et al. (2016) Increased yield of actionable mutations using multi-gene panels to assess hereditary cancer susceptibility in an ethnically diverse clinical cohort. Cancer Genet 209:130-7
Law, Ian H; Alam, Osman; Bove, Edward L et al. (2016) Follow-Up of a Prospective Surgical Strategy to Prevent Intra-Atrial Reentrant Tachycardia After the Fontan Operation. Circ Arrhythm Electrophysiol 9:

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