p16Ink4a in Bronchopulmonary Dysplasia in Children

Inclusion Criteria: Premature(\< 28 GA) neonates * Alive neonate born at less than 28 gestational age * Signed inform consent Term neonates: * Alive neonate born at least at 37 GA or more * Signed inform consent Child from 7 to 15 years old with BPD: * Child from 7 to 15 years old * Child with a BPD diagnosed * Signed inform consent Child from 7 to 15 years old without BPD: * Child from 7 to 15 years old * Child receiving a blood test * Signed inform consent Exclusion Criteria: Premature (\< 28 GA) and term neonates: -Congenital malformation Child from 7 to 15 years old with BPD: * Cystic fibrosis * Evolutive cancer * Chronic inflammatory disease * Known anemia * Refusal of participation of child or parental authority Child from 7 to 15 years old without BPD: * Other respiratory disease: severe asthma, cystic fibrosis, deficit AAT, bronchial dilatation * Evolutive cancer * Chronic inflammatory disease * Known anemia * Refusal of participation of child or parental authority