Results of the association analysis of N2lung (square-root-transformed values) with 62 SNPs on chromosome 4 in the region showing the best statistical associations (P<0.05, from 68938 to 89606 kb) and containing the Papg1 locus modulating lung tumor size. Dots represent values of statistical associations for each SNP, obtained using qfam (PLINK) and reported as minus logarithms of P values. The best associated SNP is rs3707373 (−log10P=2.8; in red dot). The position of the Cdkn2a gene is shown, with an arrow indicating the direction of transcription. Positions of genetic markers on chromosome 4 are based on NCBIM37.