Optical tweezers are a means to manipulate objects with light.Optical tweezers can obtain a nanometer space,piconewton force,and a millisecond resolution;thus,they are excellently suited for studying biological processes from the single-cell to the single-molecule level.Optical tweezers can screen and manipulate tumor cells,study single molecule,and monitor cancer treatments.Thus,optical tweezers will promote the progress of cancer research and treatments.