FOLR1 and cancer: Folate receptors, particularly folate receptor alpha (FOLR1), have been identified as promising targets for delivering doxorubicin to cancer cells, enhancing the efficacy of this chemotherapeutic agent.104 Kaittanis et al.105 investigated the interaction of polyacrylic-acid-coated magnetic nanosensors with cancer cells expressing the folate receptor, showing that high-folate magnetic relaxation nanosensors outperformed low-folate counterparts in single cancer cell detection.