<p><strong>PHILADELPHIA – </strong>The development of any type of second cancer following CAR T cell therapy is a rare occurrence, as found in an analysis of more than 400 patients treated at Penn Medicine, researchers from the Perelman School of Medicine at the University of Pennsylvania reported today in <a href="https://www.nature.com/articles/s41591-024-02826-w"><em>Nature Medicine</em></a>. The team also described a single case of an incidental T cell lymphoma that did not express the CAR gene and was found in the lymph node of a patient who developed a secondary lung tumor following CAR T cell therapy.</p>