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Table 1 Numbers of articles obtained using different search terms

From: MAPK1/ERK2 as novel target genes for pain in head and neck cancer patients

Search terms # of articles by PubMed search # of articles by initial screen # of articles from references # of articles included
Cancer pain SNPs (SNP) 74 20 14 34
Cancer pain genes (gene) 1207 0 0 0
Cancer neuropathic pain SNPs (SNP) 4 0 0 0
Cancer neuropathic pain genes (gene) 78 2 0 2
Cancer chronic pain SNPs (SNP) 12 0 0 0
Cancer chronic pain genes (gene) 204 0 0 0
Total 1579 22 14 36
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