It is difficult to diagnose cancer in the initial stage odue to the unclear symptoms which are similar to other disease by the routine medical examination then the best opportunity of medication may be missed.

As an example of colorectal cancer, usual examination methods,such as FOBT,colonoscopy,rectal touch and so on,are not ideal and could cause pain or discomfort to patient. The incidence of colorectal cancer is closely related to certain genes.Fecal DNA testing, now, shows pretty increase of correct cancer diagnose in precancer stage and the initial stage,which could also relieve the pain and discomfort during the examination of suspicious cancer carriers.Also,Fecal DNA testing is a staging method of colorectal cancer.The risk of colorectal cancer in short term (1-3 years) can be predicted by the relative genetic testing and the prediction can be used for further instruction of cancer medical interference.

The early alarming products of colorectal cancer gives the assessment results of colorectal cancer risk with the professional health instructs on the prevention or medication by combining the early stage events such as DNA methylation (such as p16 and RASSF1A), mutation and relative gene aberrant expression ( RNA and protein).

Early alarming products of liver cancer and lung cancer include the plasma DNA methylation testing, mutation testing and relative gene aberrant testing and assessment of cancer risk with professional health instructions.

These early stage alarming products find early stage cancer events to predict cancer risks with valuable positive prompt, which are quite fit for health examination and cancer prevention.