Scholars Cao and others studied the serum ALDH1A1 in nonsmall cell lung cancer diagnosis and prognosis of the potential clinical value in the experiment collected 100 patients with nonsmall cell lung cancer tumor resection before 60, 60 patients with benign lung disease and serum samples of healthy volunteers and using sandwich ELISA method were retrospectively analyzed, their results show that the levels of serum ALDH1A1 associated with the occurrence and progress of nonsmall cell lung cancer, and serum ALDH1A1 detection is helpful to the diagnosis and prognosis of nonsmall cell lung cancer. Here, ALDH1A1 is linked to neoplasm.