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BACKGROUND Growth problems are common in patients with intracranial germ cell tumours. However, the characteristics were not fully profiled, especially when stratified by orientation. Thus, we conducted this study. METHODS Patients newly diagnosed, ≤19 years, with confirmed pathology or tumour markers elevation were included. Patients with bifocal lesions or lost to follow-up were excluded. WHO AnthroPlus software, which was developed for the global application of the WHO Reference 2007 to monitor growth in children aged 5–19 years, was used. Based on age, sex, and height, the Z-scores of height(ZSOH) were calculated. A ZSOH 1 indicates faster growth than peers. RESULTS Among the 200 included patients, 75 had primary lesions originating from the sellar/suprasellar region(S/SS), 73 from the pineal gland(PG), and 52 from the basal ganglia/thalamus region(BG/T). At initial diagnosis, the median ZSOH in S/SS was -0.66(-3.76–3.05), which was significantly lower than that in PG(0.76,-2.23–5.19) and BG/T(0.64,-3.05–5.32)(p=0.001). However, the difference in ZSOH between PG and BG/T was comparable(p=0.61). In patients with S/SS who had paired data(n=36), the median ZSOH decreased from -0.22(-3.76–3.05) at diagnosis to -1.01(-3.42–1.89) at the last follow-up(p=0.001). The median ZSOHs in PG(n=38) and BG/T(n=28) remained in the normal range at last follow-up although the changes were statistically significant(p&lt; 0.001). Linear regression analysis showed that, in S/SS, age at diagnosis(β=0.115,p=0.033), sex(β=1.337,p=0.002), radiotherapy dose(β=-0.061,p=0.007), and number of chemotherapy cycles(β=-0.177,p=0.038) were correlated with changes in median ZSOH. In BG/T, only the radiotherapy dose(β=-0.064,p=0.041) and number of chemotherapy cycles(β=-0.551,p=0.026) were correlated. However, none of the above were validated in PG. CONCLUSIONS Compared to intracranial germ cell tumours in the PG or BG/T, the growth problems in S/SS was more prominent and aggravated after treatments, especially in those with younger age, female sex, higher radiotherapy dose, and more chemotherapy cycles.

QOLP-01. THE DISCREPANCY IN GROWTH PROBLEMS BETWEEN PATIENTS WITH INTRACRANIAL GERM CELL TUMOURS ORIGINATING FROM DIFFERENT LOCATIONS