Therapies should be highly effective and as free as possible of side effects—a big challenge, particularly in the case of cancer. A Chinese research team has now developed a novel form of photodynamic tumor therapy for the treatment of deep tumors that works without external irradiation. The light source is built into the drug and is “switched on” selectively in the microenvironment of tumors, as they report in the journal Angewandte Chemie.
