IL31 and lung cancer: -Association of IL-31 polymorphisms with susceptibility and survival status in lung cancer-Suggesting a role for IL-31 to be used as a biomarker along with other tumor-associated markers-Higher probability to lung cancer development in patients with CG genotype of rs7977932 or CA genotype of rs4758680-An increased risk of metastasis and lower survival rate in patients with rs7977932 CC genotype