A number of BioMed Central's journals have seen their Impact Factors increase in the 2005 Journal Citation Report. Breast Cancer Research's Impact Factor jumped from 2.98 in 2004 to 4.03 this year. BMC Molecular Biology went up to 4.49 from 3.12, and BMC Genomics increased from 3.25 to 4.09. BMC Health Services Research increased to 1.63, BMC Public Health's Impact Factor also went up, to 1.66.
BioMed Central has calculated unofficial Impact Factors for many other journals for which official figures not yet available. Using the same methods as Thomson Scientific, BioMed Central has found that these unofficial Impact Factors show show similarly high citation rates. BioMed Central continues discussions with Thomson Scientific, proposing additional journals to be considered for citation tracking.
The impact factors, which are calculated by Thomson Scientific (ISI), look at citations in 2005 of articles published in the journals in the period 2003-2004.