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Background Diffuse midline glioma (DMG), H3 K27M mutant, occurs in both adult and pediatric populations. The characteristics of the 2 DMG groups were systematically explored in this study. Methods H3 K27M–mutant DMG was diagnosed in 116 patients at Beijing Tiantan Hospital from May 2016 to December 2018 who were included in our study. Patients were classified into an adult group (n = 57; 49.1%) and a pediatric group (n = 59; 50.9%). Clinical, radiological, and molecular features were compared between the groups. Univariate and multivariate analyses were performed to identify prognostic factors. Results Compared with the adult group, pediatric patients had a younger age (8.9 ± 4.1 y vs 35.1 ± 11.8 y, P &amp;lt; 0.001), a lower preoperative Karnofsky performance scale score (62.9 ± 15.5 vs 72.1 ± 16.5, P = 0.004), a lower rate of total resection (5.7% vs 26.8%, P = 0.009), a larger tumor size (4.4 ± 0.9 vs 3.9 ± 1.5 cm, P = 0.045), a higher Ki-67 index (63.0% vs 37.8%, P = 0.047), and higher rates of postoperative cranial nerve palsy (61.0% vs 36.8%, P = 0.009) and ataxia (45.8% vs 26.3%, P = 0.029). Adult DMG was located predominantly in the thalamus, while the predilection site for pediatric DMG was brainstem (P &amp;lt; 0.001). Kaplan–Meier plot showed that the median survival of adult and pediatric DMG was 16.0 (9.7–22.3) months and 10.0 (8.3–11.7) months, respectively, which imparted a significant difference (P = 0.008). Age at diagnosis, radiotherapy, and motor deficit were confirmed as independent prognostic factors according to the multivariate analysis (P &amp;lt; 0.05). Conclusion Compared with adult patients, children with H3 K27M–mutant DMG confer distinct clinical, radiological, and molecular characteristics and have a dismal prognosis. Radiotherapy is an independent factor associated with prolonged survival.

neuro-oncology

Retracted: Diffuse midline glioma with H3 K27M mutation: a comparison integrating the clinical, radiological, and molecular features between adult and pediatric patients