How does cancer start give examples.

So there will be a mutation in one cell e. g skin cell

This will change the DNA base sequence this resulting in different/faulty proteins being made

However it is not cancer until this mutated cell divides (by mitosis) uncontrollably forming a tumor (mass of cells)

This uncontrolled cell division is the main difference between malignant tumors and benign tumors

Once one cancer cell forms in you they kill other cells and multiply.

Have a good day