What happens when DNA cant be rapaired

[VincentX]

Normally damage on DNA can be repaired by enzymes. But some times when the damage is occurred by high exposure by etc UV-light or chemical substances the reparation processes cant be done which results in cancer tumors.

What makes it unable to start the reparation?

[MrMistery]

Well, like any biological process, DNA reparation is not 100% percent efficient. therefore, if there are too many errors enough will sometimes remain to produce a cancerous tumor. But remember, the cell can still commit apoptosis.

[VincentX]

Ok so there isn't any specific protein, enzyme or environment change occurred by the cancer elicitation factors that make the reparation unavailable. It is just the matter of a non 100% perfect system combined with to many errors that failure the process?

[MrMistery]

basically yes.
Cancer elicitation factor is a general term, for anything that creates errors that cannot be repaired, leading to cancer.

[mith]

Also if your mechanic is damaged you can't repair.