undergo ... treatment• Not all cancer patientsprefer to continue working while undergoing treatment.• Since September, du Pont has been undergoing treatment at a state psychiatric hospital after being diagnosed as a paranoidschizophrenic.• Watercolourpapersundergo different sizing treatments at variousstages of the papermaking process - applied internally or externally.• The couple are still undergoing intensive treatment for injuries caused by the attempt on their lives.• Mobutu, undergoing treatment for prostate cancer, has been operating largely from his villa in nearby RoquebruneCap-Martin.• Simon has now cut right down on the amount of time he spend playing and has also undergone treatment from his doctor.• But top psychiatristProfessor Stuart Fischoff says if Diana underwent treatment it could mean the end of her marriage.