DNA samples are derived from participants' banked blood or uninvolved bone marrow. A whole genome scan of DNA samples is employed to identify candidate single nucleotide polymorphisms (SNPs). The candidate SNPs are investigated, using a gene-centric haplotyping approach, to identify 10-20 true disease-associated alleles. The disease-associated alleles are again investigated, using a gene-centric haplotyping approach, to validate 5-10 disease-associated SNPs. SNPs are then analyzed for heritable predisposition.