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The effect of Undaria pinnatifida fucoidan on the pharmacokinetics of letrozole and tamoxifen in patients with breast cancer


Tocaciu, S and Oliver, LJ and Lowenthal, RM and Peterson, GM and Patel, R and Shastri, M and McGuinness, G and Olesen, I and Fitton, JH, The effect of Undaria pinnatifida fucoidan on the pharmacokinetics of letrozole and tamoxifen in patients with breast cancer, Integrative Cancer Therapies pp. 1-7. ISSN 1534-7354 (2016) [Refereed Article]


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Copyright 2016 The Authors Licensed under Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0)

DOI: doi:10.1177/1534735416684014


Background: Although the use of complementary and alternative medicines is widespread in cancer patients, clinical evidence of their benefits is sparse. Furthermore, while they are often assumed to be safe with regard to concurrent use of anticancer therapies, few studies have been carried out to investigate possible interactions. Fucoidans are a group of sulfated carbohydrates, derived from marine brown algae, which have long been used as dietary supplements due to their reported medicinal properties, including anticancer activity. The aim of this study was to investigate the effect of co-administration of fucoidan, derived from Undaria pinnatifida, on the pharmacokinetics of 2 commonly used hormonal therapies, letrozole and tamoxifen, in patients with breast cancer.

Methods: This was an open label noncrossover study in patients with active malignancy taking letrozole or tamoxifen (n = 10 for each group). Patients took oral fucoidan, given in the form of Maritech extract, for a 3-week period (500 mg twice daily). Trough plasma concentrations of letrozole, tamoxifen, 4-hydroxytamoxifen, and endoxifen were measured using HPLC-CAD (high-performance liquid chromatography charged aerosol detector), at baseline and after concomitant administration with fucoidan.

Results: No significant changes in steady-state plasma concentrations of letrozole, tamoxifen, or tamoxifen metabolites were detected after co-administration with fucoidan. In addition, no adverse effects of fucoidan were reported, and toxicity monitoring showed no significant differences in all parameters measured over the study period.

Conclusions: Administration of Undaria pinnatifida fucoidan had no significant effect on the steady-state trough concentrations of letrozole or tamoxifen and was well tolerated. These results suggest that fucoidan in the studied form and dosage could be taken concomitantly with letrozole and tamoxifen without the risk of clinically significant interactions.

Item Details

Item Type:Refereed Article
Keywords:clinical trial, Undaria, fucoidan, tamoxifen, letrozole, complementary medicines, CAM, drug interactions
Research Division:Biomedical and Clinical Sciences
Research Group:Pharmacology and pharmaceutical sciences
Research Field:Clinical pharmacology and therapeutics
Objective Division:Health
Objective Group:Clinical health
Objective Field:Clinical health not elsewhere classified
UTAS Author:Lowenthal, RM (Professor Ray Lowenthal)
UTAS Author:Peterson, GM (Professor Gregory Peterson)
UTAS Author:Patel, R (Dr Rahul Patel)
UTAS Author:Shastri, M (Mr Madhur Shastri)
UTAS Author:McGuinness, G (Dr Georgia McGuinness)
ID Code:113658
Year Published:2016
Web of Science® Times Cited:32
Deposited By:Health Sciences
Deposited On:2017-01-11
Last Modified:2017-11-02
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