Telomere plays a critical role in chromosome stability and integrity.The variation of telomere length may lead to tumorigenesis by increasing chromosome instability.Therefore,telomere length is a potential marker of cancer risk.Compared to tumor tissue,surrogate tissues are easy to collect at an earlier time with less invasion,so measuring telomere length of surrogate tissues has the potential to be a screening tool for early detection of cancer.There has been an increasing number of studies on the relation...