Evaluation of Ocoxin®-Viusid® in Breast Cancer

Overview

The purpose is to determine the efficacy of the nutritional supplement Ocoxin-Viusid oral solution (OV) in the reduction of acute toxicity of Chemotherapy (CT) treatment with patients with breast carcinoma. A randomized, double-blind phase II clinical trial was designed, with a sample of 120 patients distributed in 2 arms: 60 patients will receive the CT treatment plus the OV, 60 will receive CT plus OV placebo. The OV / placebo will be administered before, during and 3 weeks after the conclusion of the CT. A better tolerance to the treatment is expected with the addition of the nutritional supplement.

To obtain the sample size, the proportion of patients presenting adverse reactions that require interrupting chemotherapy treatment will be taken into account. In the institution, this figure is close to 15%. Since it is a dietary supplement, with extensive information on the safety of the product, the design is used in a stage of Flemming (without early stop rules). Assuming that the Ocoxin-Viusid product would clearly be declared ineffective (maximal ineffectiveness) if the proportion of patients not presenting adverse reactions was equal to less than 85% (p0), that is the maximum level of success below which the product does not shows signs of efficacy (the study does not guarantee further research) and taking a p1 value of 95%, where p1 is the minimum level of efficacy required from which the product would be declared effective (the results guarantee to continue a study phase III). Assuming an α error of 5% (probability of rejecting the null hypothesis when it is true) and β (probability of rejecting the alternative hypothesis when it is true) of 20% (the power of the test: 1 - β = 80%), It is determined to recruit a maximum number of 59 - 60 subjects. Determine a = 54, where a is the number of responses equal and below which the product is declared ineffective (H0 is accepted). And r = a + 1 is the cut-off point, that is, the number of responses from which the efficacy level ensures to continue to a phase III study. In this case we would expect to obtain a number of successes ≥ 55. Patients will be randomized after surgery, in the chemotherapy consultation, and once they meet the established inclusion criteria. In order to achieve the masking of the research product, these have been labeled by a balanced randomized list obtained by computer, which will be in the possession of the Biostatistician of the study of the Clinical Investigations Section of INOR and the promoter. The product under study has been consecutively labeled from 1 to 120 (60 patients in each therapeutic arm).