Objective. To explore the life history of an adolescent who experiences cancer. Materials and methods. This is a qualitative study based on single-case life history. In-depth interview was used, and the results were analyzed using a reduced version of Amedeo Giorgi’s method. Results. Two central themes emerged from the data: Diagnosis implications for the personal, social and, family life of a teenager suffering from cancer and family support as crucial in coping with the disease. The support of the family was essential in overcoming cancer in an adolescent. Solid social support to the patient favored the processes of living, adapting, coping with and, overcoming cancer. Conclusions. The study allowed the researchers to understand an adolescent’s experience of living with osteosarcoma, revealing a particular world that has not been explored in depth. Sometimes childhood cancer is considered a devastating disease, which has severe implications for the patient and his family forcing them to reorganize their family and social dynamics to adapt and fight against that disease.