Heavy charged particle beams can be widely used for cancer therapy if control in heterogeneous tissue is proved practical. A beam of protons at 200 million electron volts has been visualized in plastic and in a living animal by using an on-line positron camera. The fraction of the activity retained in the radiation site was found to be at least 70 percent of that produced in a dead animal. The sensitivity of the technique was established for a typical geometry.

Brief communicationLutetium-177-prostate-specific membrane antigen ligand following radium-223 treatment in men with bone-metastatic castration-resistant prostate cancer: real-world clinical experience

The development of metastatic chest wall growths from a primary nasopharyngeal carcinoma is described. The growths developed only in areas previously irradiated prophylactically and sharply outlined the treatment portals. The adjacent skin appeared completely normal. The possible mechanisms underlying this phenomenon are reviewed.