Rhesus blood group distribution is skewed toward a higher RHD–ve occurrence in patients with SCLC compared to other forms of NSCLC lung cancer but does not appear to have any impact on overall survival. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6139339/ Conclusions: In the study population, ABO blood types were associated with the lung cancer. Having non-O blood type and Rh-negative feature increased the risk of lung cancer. However, further prospective studies are necessary to define the mechanisms by which ABO blood type may influence the lung cancer risk. https://pubmed.ncbi.nlm.nih.gov/23803034/