Table 1.

Comprehensive literature search strategies implemented across chosen databases

Data base	Search strategy	result
PubMed	(“Machine Learning“[Title/Abstract] OR “Artificial Intelligence“[Title/Abstract] OR “deep learning“[Title/Abstract] OR “Machine Learning“[MeSH Terms] OR “Artificial Intelligence“[MeSH Terms]) AND (“18F-FDG PET“[Title/Abstract] OR “FDG-PET“[Title/Abstract] OR “Fluorodeoxyglucose F18“[MeSH Terms] OR “PET“[Title/Abstract] OR “positron emission tomography“[Title/Abstract] OR “positron emission tomography“[MeSH Terms]) AND (“Glioma“[Title/Abstract] OR “Glioblastoma“[Title/Abstract] OR “Glioblastoma“[MeSH Terms] OR “Glioma“[MeSH Terms])	80
Scopus	( TITLE-ABS-KEY ( “Machine Learning” ) OR TITLE-ABS-KEY ( “Artificial Intelligence” ) OR TITLE-ABS-KEY ( “deep learning” ) OR TITLE-ABS-KEY ( “Transfer Learning” ) ) AND ( TITLE-ABS-KEY ( “18F-FDG PET” ) OR TITLE-ABS-KEY ( “FDG-PET” ) OR TITLE-ABS-KEY ( “Fluorodeoxyglucose F18” ) OR TITLE-ABS-KEY ( “18F Fluorodeoxyglucose” ) OR TITLE-ABS-KEY ( “8FDG” ) OR TITLE-ABS-KEY ( “Fluorine-18-fluorodeoxyglucose” ) OR TITLE-ABS-KEY ( “Fluorine 18 fluorodeoxyglucose” ) OR TITLE-ABS-KEY ( “Fluorodeoxyglucose F 18” ) OR TITLE-ABS-KEY ( “Positron Emission Tomography” ) OR TITLE-ABS-KEY ( “PET Imaging” ) OR TITLE-ABS-KEY ( “PET Imagings” ) OR TITLE-ABS-KEY ( “Positron-Emission Tomography Imaging” ) OR TITLE-ABS-KEY ( “Positron Emission Tomography Imaging” ) OR TITLE-ABS-KEY ( “Positron-Emission Tomography Imagings” ) OR TITLE-ABS-KEY ( “PET Scan” ) OR TITLE-ABS-KEY ( “PET Scans” ) ) AND ( TITLE-ABS-KEY ( “glioma” ) OR TITLE-ABS-KEY ( “glioblastoma” ) OR TITLE-ABS-KEY ( “Gliomas” ) OR TITLE-ABS-KEY ( “Glial Cell Tumors” ) OR TITLE-ABS-KEY ( “Glial Cell Tumor” ) OR TITLE-ABS-KEY ( “Mixed Glioma” ) OR TITLE-ABS-KEY ( “Mixed Gliomas” ) OR TITLE-ABS-KEY ( “Malignant Glioma” ) OR TITLE-ABS-KEY ( “Malignant Gliomas” ) )	264
WOS	((((((TS=(“Machine Learning” )) OR TS=(“Artificial Intelligence”)) OR TS=(“ deep learning”)) OR TS=(“Transfer Learning”))) AND ( (((((((((((((((TS=(“18F-FDG PET” )) OR TS=(“FDG-PET”)) OR TS=(“Fluorodeoxyglucose F18”)) OR TS=(“18F Fluorodeoxyglucose”)) OR TS=(“18FDG”)) OR TS=(“Fluorine-18-fluorodeoxyglucose”)) OR TS=(“Fluorine 18 fluorodeoxyglucose”)) OR TS=(“Fluorodeoxyglucose F 18”)) OR TS=(“Positron Emission Tomography”)) OR TS=(“PET Imaging”)) OR TS=(“PET Imagings”)) OR TS=(“Positron-Emission Tomography Imaging”)) OR TS=(“Positron Emission Tomography Imaging”)) OR TS=(“Positron-Emission Tomography Imagings”)) OR TS=(“PET Scan”)) OR TS=(“PET Scans”))) AND (((((((((TS=(“glioma”)) OR TS=(“glioblastoma”)) OR TS=(“Gliomas”)) OR TS=(“Glial Cell Tumors”)) OR TS=(“Glial Cell Tumor”)) OR TS=(“Mixed Glioma”)) OR TS=(“Mixed Gliomas”)) OR TS=(“Malignant Glioma”)) OR TS=(“Malignant Gliomas”))	82