Circulating tumor cells (CTCs) have a characteristic identification in metastasis. In order to monitor, diagnose, and analyze early-stage non-hematologic cancers, these rare cells must be separated from the whole blood with high efficiency. Thus, a microfluidic chip coated with E-selectin and microscopic inclined three-dimensional groove and wave patterns, which increases the probability of cell contact and separates the leukocytes and CTCs even further, is created.