Cancer.

Cellular division is a common and a natural process, i In the body, there are cells with and without division capacity. On Of the cells with division capacity (depending of on the stress or function), that division can occur quickly or slowly. The Cellular division is a complex process that to use uses cellular components in clearly defined phases clearly defined (mitosis and meiosis). The key point in the of cellular division is to get a correctly replicated strand of DNA (Deoxyribonucleic Acid). However, When intracellular machinery fails and a mutation occurs a mutation, different intracellular or extracellular regulators to usually kill the damaged cells.

Cellular mutations occur frequently in the body but if such mutations fall down end up in strategic positions and get away of from regulators;, over time, other mutations can occur and generate a cancer cell. Clinically/Technically, cancer cells can be killed/destroyed it and eliminated when they are yet still in the organ itself; however, when cancer cells migrate to other organs, metastasis cell cancer would cells will be more difficult to eliminate and to will generate a bigger problems.

Saludos desde México.

Great job, José Alberto!  ...a very advanced topic and very few/minor errors!

Cancer.

Cellular division is a common and a natural process, in the body, there are cells with and without division capacity. On cells with division capacity (depending of on the stress or function), that division [Maybe you mean : the process] can occur quickly or slowly. The cellular division is a complex process that to which uses cellular components in phases clearly defined (mitosis and meiosis). The key point in the cellular division is to get a correctly replicated DNA [or maybe you mean : To get a replicated DNA correctly] (Deoxyribonucleic Acid). However, when intracellular machinery fails and a mutation happens, different intracellulars or extracellular regulators to kill the damaged cells. 

Cellular mutations occur frequently in the body but if such mutations fall down in strategic positions and get away of from regulators; over time, other mutations can occur and generate a cancer cell. Clinically, cancer cells can be killed it and eliminated when they are still yet in the organ theirselves; however, when cancer cells migrate to other organs, metastasis cell cancer would be more difficult to eliminate and to it would generate a bigger problems.

Saludos desde México.