For selected patients, continuous infusion of a cancericiEdsl drug directly into the tumor area, through a catheter threslded into the artery which supplies the tumor, is providing significant pa71iation. kq portable unit has been developed which will now permit some patients to continue this therapy at home. Since treatment is local, so are the signs of drug toxicity, the authors point out. They also discuss some of the precautions attendant to insertion and use of the intra-arterial catheter.