Apparantly, a suppliment of vitamen A is going to help him by leaps and bounds as hes not able to produce enough, therefore his body cannot fight the wart.
It's actually HPV (human papilloma virus) and his body lacked the ability to produce the vitamins which keep the infection in check. His skin cells, lacking these key defenses, were essentially 'hijacked' by the virus and resulted in these large cutaneous growths.
His immune deficiency is 1 in a million and it was by chance that he came in contact with the virus in the first place.
An American dermatologist has devised a treatment to enable the man to regain use of his hands and live a normal life.