Table 1

- Features of included articles (N=14).

Author name and yearStudy designCountryPeriod since completion of radiation (month)Type of tumorNumber of patients
Cicone et al28 2015RetrospectiveItaly3 to 45Brain metastases42
Dandois et al29 2010RetrospectiveBelgium2Astrocytic tumours with grades III Astrocytic tumours with grades IV grade III oligoastrocytomas28
D’Souza et al30 2014ProspectiveIndia7 to 19High-grade gliomas (III-IV)29
Estrada et al31 2008ProspectiveMexicoNDChoroid plexus carcinoma Anaplastic astrocytoma Glioblastoma multiforme Gliosarcoma Anaplastic oligoastrocytoma30
Hatzoglou et al32 2016ProspectiveUSA≤3Gliomas (II to IV) Brain metastases53
Hojjati et al33 2018RetrospectiveUSA2 to 90Glioblastoma multiforme24
Jabeen et al34 2021RetrospectiveIndia3 to 12Glioblastoma multiforme oligodendroglioma (grade II-IV) Anaplastic oligodendro glioma Anaplastic astrocytoma48
Kim et al35 2010RetrospectiveKorea3 to 91Anaplastic astrocytoma Glioblastoma Anaplastic oligodendroglioma10
Prat et al36 2010RetrospectiveSpainNDAnaplastic astrocytoma Astrocytoma Ependymoma Glioblastoma multiform24
Pyka et al37 2018RetrospectiveGermany15Glioblastoma Anaplastic Astrocytoma, Diffuse astrocytoma Oligodendroglioma Anaplastic oligodendroglioma47
Qiao et al38 2019RetrospectiveChina>3High-grade tumor (grade III-IV)42
Sacconi et al39 2016RetrospectiveUSANDLow- and high-grade tumor (grade II to IV)20
Seligman et al40 2019RetrospectiveCanada2 to 156Grade III Grade IV41
Steidl et al41 2021RetrospectiveGermany6 to 12Oligodendroglioma Astrocytoma Astrocytoma Glioblastoma104

ND: not defined, USA: United States of America