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Journal of Oncology Pharmacy Practice 2014-Apr

Pilot study to assess toxicity and pharmacokinetics of docetaxel in patients with metastatic breast cancer and impaired liver function secondary to hepatic metastases.

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Karen Eckmann
Laura B Michaud
Edgardo Rivera
Timothy L Madden
Laura Esparza-Guerra
Jitesh Kawedia
Daniel J Booser
Marjorie C Green
Gabriel N Hortobagyi
Vicente Valero

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BACKGROUND

Limited clinical data are available regarding the safety of docetaxel in metastatic breast cancer patients with liver dysfunction.

METHODS

Eligible patients had breast cancer with impaired liver function secondary to hepatic metastases and were candidates for docetaxel therapy. They were assigned to one of five groups on the basis of total bilirubin, alanine aminotransferase, aspartate aminotransferase, and alkaline phosphatase levels. All other causes of liver dysfunction were excluded, and bile duct obstruction was corrected, if possible, prior to study entry. Patients received docetaxel every three weeks. The chemotherapy dose was chosen on the basis of the patient's level of hepatic dysfunction and escalated as tolerated. The primary outcome of this study was safety. The secondary outcomes were pharmacokinetic data and efficacy in terms of time to disease progression.

RESULTS

Twenty-three patients were enrolled. No unexpected toxicities occurred. Grade 3/4 fatigue (65%), neutropenia (30%), myalgias (26%), neutropenic fever (26%), vomiting (9%), and rash (9%) were the most common serious adverse events. The median time to progression was three months (range 1-18 months). Pharmacokinetic results indicated that patients with more severe hepatic dysfunction may have been underdosed based on our conservative dosing strategy.

CONCLUSIONS

Docetaxel can be administered to patients with metastatic breast cancer and liver dysfunction after dose attenuation. However, because of a narrow therapeutic index in this clinical setting, therapy should be closely monitored with subsequent dose escalation when possible.

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