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Colorectal cancer is one of the most common malignant tumors and its incidence is increasing year by year. Early detection of colorectal cancer is crucial for treatment and prognosis, so screening has become one of the important means to prevent colorectal cancer. At present, the commonly used colorectal cancer screening methods include colonoscopy, stool occult blood test and so on.

Drug control is a worldwide problem, drug abuse not only harms the physical and mental health of individuals, but also brings a huge negative impact on the society. Drug users often get stuck in the drug mire and find it difficult to extricate themselves.

June 26 is the International Day against Drug Abuse and Illicit Trafficking designated by the United Nations to call attention to the issue of drug control, raise people's awareness of the harm of drugs, and call on the whole society to participate in anti-drug work.

Drug is a kind of substance that endangers human health and social stability. It can seriously damage human organs, impair human brain and body functions, and lead to serious physical and psychological problems.

Colorectal cancer is one of the most common malignant tumors of the digestive system worldwide, and early diagnosis and treatment are essential to improve the survival rate of patients.

Based on the characteristics of drug detection in different biological materials such as blood, urine, hair, saliva and nails, different methods can be applied at different stages in drug prevention and control and fight in the future, and different detection methods can be selected for different groups of people.

Drug users are more likely to be infected with AIDS than ordinary people, and the factors related to drug use itself are as follows:

In 2021, one in 17 people aged 15-64 globally will have used a drug in the previous 12 months. The increase in the estimated number of users from 240 million in 2011 to 296 million in 2021 (5.8 per cent of the global population aged 15-64) shows that the drug problem can be global and its scale is growing.

World Blood Donor Day is held on 14 June each year to raise awareness and awareness of blood donation and encourage more people to donate their love and help others in their lives. Donating blood not only saves lives, it also provides an important resource for medical research and helps scientists better understand human health and disease.

Calprotenin is a calcium-zinc binding protein complex. It is found almost throughout the body, but is mainly found in white blood cells (also known as neutrophils), and is also expressed in monocytes and macrophages. In the case of inflammation of the gastrointestinal tract, white blood cells are drawn into the intestine and release the chemical mediators of inflammation and calprotenin in the intestine, thus increasing the concentration of calprotenin in the stool.