Astragalus
Astragalus is an herb
that has been used in Chinese herbal medicine for thousands of years for
wasting/ thirsting syndrome, to promote urination and reduce edema, to promote
healing, and after significant loss of blood.
Efficacy
Although by different
name and description, astragalus has been used for immune stimulation for centuries.
Astragalus has been
widely studied in vitro and in vivo for its immune-potentiating activity in malignancies. Astragalus extracts
exhibited immunopotentiating activity and one fraction of the herb was capable
of fully correcting in-vitro T-cell function deficiency. Further research in
mice with immunosuppression from cyclophosphamide or radiation treatment
demonstrated that astragalus extracts enhanced antibody production and this
effect was associated with increased T-cell activity. In-vitro studies
demonstrated that urological neoplasms suppressed macrophage function and that
this suppression was reversed by astragalus extract.
A meta-analysis of
astragalus-based Chinese herbs and platinum-based chemotherapy for advanced
non-small-cell lung cancer (34 randomized studies representing 2,815 patients)
concluded that astragalus may increase the effectiveness of platinum-based
chemotherapy. Combined results from the meta-analysis demonstrate overall
benefit. Twelve studies reported reduced risk of death at 12 months. Thirty
studies reported improved tumor response. Performance status in most studies
was stable or improved. Among the studies reporting median survival, none included
confidence intervals, P values of variance. Therefore, a meta-analysis of
median survival could not be done. Despite this, the authors of the analysis
concluded that combining astragalus with platinum-based chemotherapy in the
treatment of non-small-cell lung cancer may increase survival, tumor response,
performance status, and reduce chemotherapy toxicity when compared to
platinum-based chemotherapy alone.
Safety
Based on preliminary
animal studies and limited human research, astragalus may decrease blood sugar
levels. Based on anecdotal reports and preliminary laboratory research,
astragalus may increase the risk of bleeding. Preliminary reports of human use
in China and animal research suggests possible blood pressure lowering effects.
Due to a lack of well-designed studies, no firm conclusions can be drawn.
Nonetheless, people with abnormal blood pressure or taking blood pressure
medications should use caution and be monitored by a qualified healthcare
professional.
Recommendations
Astragalus may help
prevent the immunosuppression caused by chemotherapy agents. Additionally,
there is some indication that astragalus may also potentiate the cytotoxic
effects of certain chemotherapy agents. Herb-drug interactions of astragalus
with chemotherapy drugs have not been studied.
http://depts.washington.edu/integonc/clinicians/act/astralagus.shtml
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