the breathing is controlled by the brain. sometimes due to increase of the pressure in the brain can cause breathing problems, sometimes it will be dangerous also. the other reason to exclude is tumor
spread to the lungs.
the treatment will be directed towards the cause.Raised pressure in the brain is due to swelling of the brain, by accumulation of the liquid(edema) ,it can be treated by drugs but if it is due to tumour enlargement, there is no treatment, as he has already received radiation