Objective: To analyze the repetition and stability of SELDI (Surface enhanced laser desorption / ionization) technique. Methods: Seventeen patients were divided into group A and group B. Twelve cancer patients of group A were asked to provide one blood samples each in the early morning, and the samples were then divided into two subgroups after centrifugation, one tested by SELDI mass spectrometry immediately, and the other tested by the same way after storage at -80 ℃ for one week. The blood samples were t...