PMID- 25557360 OWN - NLM STAT- MEDLINE DCOM- 20150611 LR - 20211203 IS - 1545-5017 (Electronic) IS - 1545-5009 (Linking) VI - 62 IP - 4 DP - 2015 Apr TI - Factors affecting response to everolimus therapy for subependymal giant cell astrocytomas associated with tuberous sclerosis. PG - 616-21 LID - 10.1002/pbc.25368 [doi] AB - BACKGROUND: The aim of the study was to investigate factors affecting response to everolimus, a mammalian-target-of-rapamycin (mTOR) inhibitor, of subependymal giant cell astrocytomas (SEGA) in patients with tuberous sclerosis complex (TSC). METHODS: The study group consisted of 15 children with a diagnosis of TSC-related SEGA. Median therapy duration was 13 months. Age, sex, previous neurosurgical or mTOR inhibitor treatment, everolimus blood concentration and anticonvulsant therapy were analyzed as potential factors affecting reduction of SEGA tumor volume. RESULTS: Significant reductions in SEGA volumes were noted at 3 and 6 months (median tumor volume 0.97 cm(3) and 0.70 cm(3) , respectively, versus 2.70 cm(3) at baseline, P = 0.001). Responses were observed in 11/15 (73.3%) and 10/12 (83.3%) patients at 3 and 6 months, respectively. The most rapid reduction of SEGA volume (58.6%) was found during the initial 3 months of treatment. There was no statistical difference in the extent of SEGA volume reduction between patients with everolimus trough levels <5 ng/ml and >/=5 ng/ml. Patients treated with