The PDQ editorial boards use a ranking system of levels of evidence to help the reader judge the strength of evidence linked to the reported results of a therapeutic strategy. For any given therapy, results of prevention and treatment studies can be ranked on each of the following two scales:
Strength of the study design.
Strength of the endpoints.
Together, the two rankings provide a measure of the overall level of evidence. Screening studies are ranked on strength of study design alone...
Revised text to state that for a full description of the classification of nervous system tumors and a link to the corresponding treatment summary for each type of brain tumor, refer to the PDQ summary on Childhood Brain and Spinal Cord Tumors Treatment Overview.
The Predictors of Outcome subsection was extensively revised.
Cellular Classification of Central Nervous System (CNS) Embryonal Tumors
Added Taylor et al. as reference 27.
Added text about the characteristics of Gorlin syndrome, including the associated mutations and diseases, predisposition to basal cell carcinomas, and the diagnostic features (cited Brugières et al. and Pastorino et al. as references 28 and 29, respectively).
This summary is written and maintained by the PDQ Pediatric Treatment Editorial Board, which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ NCI's Comprehensive Cancer Database pages.
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WebMD Public Information from the National Cancer Institute
February 25, 2014
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