Clinical and Pathological Profile of Children and Adolescents with Osteosarcoma.

Osteosarcoma (OS) is the most common type of primary malignant bone and cartilage tumour. Because of the remarkable developments in technology, remarkable progress has been made in the medical field regarding the diagnosis and management of OS patients. The aim of the study is to describe the clinical and pathological profile of paediatric patients with osteosarcoma and to identify potential prognostic factors for an unfavourable outcome in our country. We conducted a retrospective study of all children and adolescents with musculoskeletal tumours diagnosed and treated at our tertiary Orthopaedic Department for a period of 10 years. A group of 65 children and adolescents with osteosarcoma who benefited from diagnosis, neoadjuvant, adjuvant and surgical treatment in the Emergency Clinical Hospital for Children "Sfânta Maria" Iasi, România, was analysed. The average age at the time of diagnosis was 12.9 years. The analysis revealed a higher frequency for male patients in the case of femur and tibia locations and a significantly higher frequency of osteosarcoma in the scapula and clavicle in female patients, while OS in the humerus was found only in male patients (χ = 19.46, = 0.0149). The most frequent histopathological subtype was osteoblastic osteosarcoma, but there was no significant correlation with the gender or the age of the patients (χ = 0.73, = 0.863 and χ = 0.843, = 0.839). The results indicated instead a significantly ( = 0.0185) lower age values of patients with undifferentiated osteosarcomas, the average age being 9.4 years ± 2.1 SD. After performing a multivariate logistic regression analysis for the risk of death based on clinical parameters, we found that high tumoural grading increases the risk of death 2.8 times, pleomorphic histological subtype increases the risk of death 3.5 times, and stage IV TNM increases this risk 5.9 times. For the north-eastern geographical part of Romania, the epidemiological and clinical profile of a child with osteosarcoma is a 13-year-old boy with a femoral or tibia tumour or a 12-year-old girl with a femoral, tibia, scapula or clavicle tumour, both coming from a rural area. The tumour has around 12 cm diameter and is a differentiated osteoblastic osteosarcoma. The survival rate at 10 years is 63%. Tumour grading, histological subtype and TNM staging significantly influence the probability of death and could be important prognostic parameters for patients with osteosarcoma.