Acute lymphoblastic leukemia B (B-ALL) represents a haematological malignancy with poor clinical outcome and low survival rates in adult patients. Only 61 % of Colombian adult patients with ALL achieve complete remission (CR), median overall survival is 11.3 months and event-free survival (EFS) is 7.34 months. Identification of prognostic factors is crucial for the application of proper treatment strategies and subsequently for successful outcome. In this study through microarray analysis, we identified a gene expression signature that can distinguish patients with poor from good response to treatment. In addition, we analyzed the prognostic relevance of immunophenotypic markers included in the EuroFlow protocol and found for the first time, that combined evaluation of gene expression signature and the immunophenotypic profile in the cohort of Colombian patients with B-ALL, can improve classification into risk groups. Finally, an in vitro cellular model of B-ALL was used as an in vitro model for modulating the expression of ID1, ID3 and IGJ genes. We identified that these genes could be modulators of different molecular events that may promote resistance to therapy and the unfavorable outcome of adult patients with B-ALL.