Abstract
Chronic lymphocytic leukemia is the most common form of leukemia found in the West, primarily affecting individuals between 65 and 72 years old, with a survival rate of approximately 10 years. The aim of this study was to describe the clinical presentation of chronic lymphocytic leukemia by relating it to a case of a young patient wiyh this disease, seeking to discuss possible clinical factors associated with prognosis. To this end, a review of the patient's medical record was conducted, along with a search of the scientific literature, and articles presenting relevant data were selected for this study. Based on the research conducted, the importance of using the Chronic Lymphocytic Leukemia International Prognostic Index, which considers disease progression and aids in therapy, was noted. Additionally, it was observed that chronic lymphocytic leukemia is a disease that can significantly affect the life expectancy of affected individuals, especially older ones. However, despite the patient being young, her prognosis tends to be unfavorable, mainly due to the presence of unmutated immunoglobulin heavy chain variable region gene, which is associated with a poorer response to treatment and lower overall survival.