Fatigue Clinical Trial
Official title:
Guaraná ("Paullinia Cupana") for Radiation Related Fatigue in Breast Cancer Patients: Results Of A Pilot Double Blind Randomized Study
We hypothesize that Guaraná, a native plant from the Amazon, might improve radiation-induced fatigue in breast cancer patients undergoing treatment. In order to assess this, we randomized patients to either guaraná extract or to placebo, switching the assigned treatment mid-term through the radiation.
The aim of this study is evaluate the favourable effects of Guaraná in memory and cognition
in humans After approval by our Institutional Review Board, we included consenting patients
with a histological diagnosis of early stage Breast Cancer for whom adjuvant radiation
therapy was indicated. We excluded patients with a previous history of Radiation Therapy,
anemia or clinical depression. We also excluded patients who were unable to grant informed
consent or those who had medical contraindindications for the use of Guaraná (because of its
psycho stimulant effect) such as uncontrolled hypertension, previous history of cardiac
arrhythmia and insomnia.
The radiation therapy for patients who underwent mastectomy consisted of 28 fractions of
180cGy.
This study had a double-blind randomized design with crossover between experimental arms.
After getting informed consent, we randomized patients at the beginning of radiation
treatments (Phase I) to either 75 mg of Guaraná extract daily (Group A) or to Placebo (Group
B). Randomization was centralized by the pharmacist. Halfway through the radiation
treatments (Phase II), we switched patients from placebo to guaraná and vice versa. The
protocol ended at the last session of radiation treatments (Phase III). In each of these
three phases a new assessment of fatigue and depressive symptoms was undertaken, ie:
immediately before the first radiation treatment (phase I); at switching (phase II) and
right before the start of the last radiation treatment (phase III). At these three
assessment points, patients had to complete the Chalder Fatigue Scale,4 the MD Anderson
Brief Fatigue Inventory (available at http://www.mdanderson.org/topics/fatigue/) available
in Portuguese, and the Beck Inventory Depression Scale II also validated in Portuguese.
We conducted the statistical analysis of the data with the Numerical Control Software
Solution (www.ncss.com). We employed the repeated measures analysis of variance (ANOVA) test
to compare tests scores within the same patient group and the ANOVA test to compare test's
scores between the two groups (at similar phases of the study).
;
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Caregiver, Investigator), Primary Purpose: Treatment
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