A team developed an ultrathin, conformal crystalline‑silicon Hall sensor array designed to monitor three‑dimensional tumor tissues at early stages. Described in npj Flexible Electronics, the sensor pairs high sensitivity with mechanical conformability to track magnetic and electrical signatures from tumor models. Authors demonstrated the device on 3D tumor tissue cultures, showing earlier detection of growth‑related signals than standard surface sensors. The platform integrates with flexible electronics and promises minimally invasive monitoring for engineered tissues and preclinical implants. Engineering and translational teams will evaluate robustness, biocompatibility and integration with multiplexed readouts as the next steps toward in vivo validation or lab‑based tumor assays.