[Relationship between the Age of Diagnosis and Clinical Outcomes in Children with Chronic Immune Thrombocytopenia].

Objective: To explore the relationship between age at diagnosis and clinical outcomes in children with chronic immune thrombocytopenia (cITP).

Methods: A retrospective analysis was conducted on 117 children with cITP, according to the age at which the patient was diagnosed with ITP, they were divided into two groups: the<10 year old group and the ≥10 year old group, the general information and clinical outcomes of the two groups of children were compared and analyzed. Logistic regression analysis was used to analyzed the impact of age at the time of diagnosis on clinical outcomes, and the predictive evaluation value of age on outcomes was assessed by the receiver operation characteristic.

Results: Compared with the group with diagnosed age<10 years old, the proportion of second-line drug treatment (41.46% vs 18.42%) in the diagnosed age group ≥10 years old was significantly higher, and the proportion of ≥grade 3 bleeding (36.59% vs 13.16%) was significantly higher, which was significant statistical differences ( P < 0.05). However, there was no statistically significant difference in the proportion of untreated CR between the two groups after 5 years of diagnosis (P >0.05). Logistic regression results show that age (older) was an unfavorable/dangerous influencing factor for the occurrence of ≥grade 3 bleeding after second-line treatment (OR >1, P < 0.05). For the occurrence of CR after 5 years of diagnosis without treatment, age was not the influencing factor (P >0.05). ROC analysis showed that age have a certain predictive and evaluative effect on the use of second-line treatment and the occurrence of ≥grade 3 bleeding, with AUC of 0.741(95%CI : 0.549-0.938) and 0.786(95%CI : 0.605-0.940), respectively. However, there was basically no predictive evaluation value for the occurrence of CR after 5 years of diagnosis without treatment.

Conclusion: Older age at the time of diagnosis is not conducive to the prognosis of cITP patients.