KIND OF STUDY:
Primary, clinical, prospective, randomized, two-parallel-group, double-blind, controlled, interventional, analytical. SAMPLE CALCULATION: based on proportions observed in a previous study with and without antibiotic use in breast surgery (VEIGA-Filho, 2010) the number calculated
Patients Patients with LC, CRC and BC with good performance status and with tumor tissue available, at failure of conventional therapies or without possibility to be treated with therapy of proven efficacy, will be included in the study. Initial patient characterization will include detailed