Let's say you have three risk SNPs from different genes that have been associated with a particular disease in different studies, but, as far as I know, there is no study including all. ORs have been calculated for each risk SNP
Gene A OR = 0.8
Gene B OR = 1.2
Gene C OR = 5.8
Is it possible to, in a particular way, add the OR or compute an OR for a particular "haplotype"?
For example, if patient A has risk SNP A, and B, but not C, his OR for the disease is...?