In addition, immune cell ratios for CD4/CD8, NLR, B cell/lymphocyte, T cell/lymphocyte, Neu + Mono/lymphocyte, Eos/lymphocyte, CD4nv/lymphocyte, B cell/CD8, CD8/Treg, Bnv/Bmem, CD4nv/CD4mem, CD8nv/CD8mem, and Treg > 0 vs. Treg = 0 were not statistically significantly associated with lung cancer risk overall or by histologic types (Table 2). Here, CD4 is linked to lung cancer.