A female patient has been diagnosed with cervical erosion, which is a precancerous pathology. What defense mechanism can prevent the development of a tumor?

Answer options

1. High-dose immunological tolerance
2. Simplification of the antigenic structure of tissues
3. Increase in the activity of lysosomal enzymes
4. Increase in natural killer level (NK-cells)
5. Low-dose immunological tolerance

Explanation

Increase of natural killer level. Natural killer cells are cells that play major roles in fighting both tumor cells and virally infected cells.