Early detection of cancer greatly increases the chances for successful treatment. In the later stages, when there are already symptoms of the disease and there is a possibility of spread of the tumor, the treatment of the disease becomes more complicated. Therefore, detection and treatment of a tumor at an early stage, before it spreads, is the most effective way to reduce mortality from malignant neoplasms.

It often happens that the tumor is not always detected in the early stages, since the early course of the disease is asymptomatic, the patient does not feel changes in his state of health and does not go to the doctors for examination.

It is important to emphasize that screening does not mean that cancer is suspected. It is carried out for preventive purposes among a healthy population for the timely detection of possible neoplasms.

 In Kazakhstan, there is a National Program for the fight against cancer, within the framework of which screening examinations are carried out for the population in 3 areas:
 Breast cancer - women from 40 to 70 years old.
 Cervical cancer - women from 30 to 70 years old.
 Colorectal screening - men and women from 50 to 70 years old.

Screening can be done at the polyclinic at the place of attachment within the framework of the GOBMP / OSMI.

In addition, at the legislative level, the right of employees to social leave for screening is fixed, for which three working days are allotted with the preservation of wages and workplace.