Investigation of serum C-type natriuretic peptide concentration at diagnosis and remission in pediatric osteosarcomas.

Osteosarcoma (OS) bone tumor of childhood although the etiology of OS has not been fully elucidated, there is evidence linking it with factors related to pubertal development. In recent years, plasma CNP concentration and height velocity in children and CNP have been implicated as an emerging new growth marker during childhood. We aimed to determine the serum NT-proCNP levels of patients with pediatric osteosarcoma and its relation with clinical-laboratory growth parameters and look for any correlation of serum NT-proCNP levels with different prognostic factors in childhood osteosarcoma. This study enrolled 15 newly diagnosed OS patients and 31 healthy controls. All subjects were physically examined. Plasma NT-proCNP concentration was measured by enzyme-linked immunosorbent assay. Our results demonstrated that serum NT-proCNP concentration was significantly different between OS patients and control groups. At diagnosis, the OS patient's mean blood NT-proCNP concentration was 49.7 ± 3.3 pmol/l, which was substantially lower than the control group's concentration of 61.4 ± 3.10 pmol/l (p < 0.005). No significant correlation was found between serum NT-proCNP concentration and growth parameters.

Conclusion: In conclusion, we found that the serum NT-proCNP concentration was significantly different between OS patients and control groups. It is predicted that our results will contribute to osteosarcoma biology.

What is known: • Osteosarcoma (OS) is the most common malignant bone tumor of childhood, affecting rapidly growing bones with factors associated with rapid bone growth, although its etiology is not fully understood. • The current literature suggests that the main role of the CNP/NPR-B signaling pathway is associated with endochondral bone development and related growth in long bones.

What is new: • We demonstrated that serum NT-proCNP concentration was significantly different between OS patients and control groups and could be used as a potential biomarker. • To our knowledge, this is the first clinical study evaluating the relation of serum serum NT-proCNP levels with anthropometric parameters in osteosarcoma patient with a particular interest to identify the possible role of CNP in pediatric osteosarcoma and its relationship with prognostic factors.