title: Bibliometric analysis on retinoblastoma literatures in PubMed during 1929 to 2010.
abstract: OBJECTIVE
  To determine the growth rule and tendency of retinoblastoma (Rb) literature, and to provide the basis for research of diagnosis, treatment and on Rb.
  
  
  METHODS
  Bibliometric analyses were carried out on Rb literatures which contain the descriptors of Rb in their titles or texts from 1929 to 2010 in PubMed database (www.ncbi.nlm.nih.gov/Pubmed). The biomedical journals referring to Rb by using bibliometric indicators were calculated. The principal bibliometric indicators, i.e., Price's and Bradford's laws to the increase or distribution of scientific literature, the participation index of languages and the journals were applied. By means of manual coding, Rb documents were classified according to documents studied and to statistical analysis.
  
  
  RESULTS
  During 1929-2010, there were 16162 literatures in the PubMed database including the word Rb. According to the literature type, it includes Review (n=2026), Randomized Controlled Trial (n=7), Practice guideline (n=3), meta-analysis (n=4), letter (n=215), editorial (n=98), clinical trial (n=115) and others (n=13694). By the statistical analysis, its equation is near power index (y=3.0477x(2.6088), R(2)=0.9666). From 1929 to 2010, Rb literatures in English were primarily dominant (90.71%) and the amount of the literature in Chinese ranked the fourth (1.37%). By searching PubMed, 1420(8.8%) literatures covered were from 41 of 48 ophthalmological, and 406 (2.5%) literatures from 44 of 86 pediatrics journals that correlated with retinoblastoma (SCI-indexed). The data showed that the literatures of Rb were gradually increasing year by year and were approximate near power index during 1929-2010, and the document publishes published mainly in ophthalmological journals, and in English (90.71%), and showing that the study on Rb is a popular subject in the last half century.
  
  
  CONCLUSIONS
  The literatures of Rb are gradually increasing, mainly English in ophthalmologic journals.
authors.affiliation: Department of Urology, Tangdu Hospital, the Fourth Military Medical University, Xi'an 710038, Shaanxi Province, China.
authors.forename: Zhi-Guang
authors.initials: ZG
authors.lastname: Zhao
authors.forename: Xue-Gang
authors.initials: XG
authors.lastname: Guo
authors.forename: Chang-Tai
authors.initials: CT
authors.lastname: Xu
authors.forename: Bo-Rong
authors.initials: BR
authors.lastname: Pan
authors.forename: Li-Xian
authors.initials: LX
authors.lastname: Xu