In addition, according to the results of the FPRP test, we confirmed that the SDF-1 rs1801157 gene polymorphism was only associated with lung cancer risk in the allele model (A vs. G, FPRP = 0.019), whereas the polymorphism was associated with susceptibility to urologic cancer in the dominant gene model (AA + AG vs. GG, FPRP = 0.001) at an a priori probability level of 0.001 and an OR of 1.5. The gene discussed is PTGFRN; the disease is lung cancer.