FAP-Targeted Radiopharmaceutical Therapy Achieves Responses in Advanced Cancers
Targeting the common tumor protein could provide broadly applicable radiotherapy.
A novel radiopharmaceutical therapy approach that targets fibroblast activation protein (FAP)-which is highly expressed on many types of cancers-is safe and effective for patients, according to a new study published in the June issue of The Journal of Nuclear Medicine. In a study of nearly 90 patients with 21 different types of cancer, FAP-targeted radiopharmaceutical therapy achieved objective responses in approximately two-thirds of patients and disease control in more than 80 percent.
Radiopharmaceutical therapy has already transformed care for neuroendocrine tumors and metastatic castration-resistant prostate cancer, but patients with other tumor types still lack targeted treatment options. FAP is rare in healthy adult tissue but overexpressed in solid cancers-including breast, colorectal, gastric, and ovarian cancers and sarcomas-making it an attractive target for new radiopharmaceutical therapy approaches.
The first-in-human study included 88 patients with heavily pretreated, end-stage cancers representing 21 distinct advanced metastatic solid tumors. In total, patients received 227 cycles of either 177Lu-, 90Y-, or 225Ac-3BP-3940 FAP radiopharmaceutical therapy. Researchers evaluated toxicity, assessed treatment response, and calculated survival from the start of therapy.
Administrations of the FAP-targeted radiopharmaceutical therapies were well tolerated, with mild adverse events. After two cycles of therapy, tumor response included complete remission (3.0 percent), partial remission (51.5 percent), stable disease (15.2 percent), and progressive disease (30.3 percent). The FAP-targeted therapy demonstrated potent antitumor activity, achieving objective responses in 66.7 percent of patients and disease control in 80.4 percent. For the entire cohort, the median overall survival was seven months from the start of FAP-targeted radiopharmaceutical therapy.
“This study included patients with very advanced cancers who had already gone through multiple treatments,” said Richard P. Baum, MD, PhD, professor in the Department of Molecular Radiotherapy at Curanosticum Wiesbaden-Frankfurt in Germany, an ICPO Center of Excellence. “Even in this challenging group, we observed tumor shrinkage or disease stabilization in many cases. For patients who have run out of options, this kind of therapy can make a meaningful difference, not only in controlling the disease but also in maintaining quality of life.”
As research continues, this approach could make radiopharmaceutical therapy accessible to a much wider group of patients.
“What makes this work exciting is that we’re no longer limited to treating just one cancer type. By targeting the tumor microenvironment itself, we’re seeing meaningful responses across many cancers, even in patients with few remaining options,” said Jingjing Zhang, MD, PhD, assistant professor in the Department of Diagnostic Radiology at the National University of Singapore. “This could open the door to a new generation of radiopharmaceutical therapies that are much more broadly applicable.”
Reference: Baum RP, Zhao T, Jakobsson V, et al. Fibroblast activation protein-targeted radiopharmaceutical therapy using 177Lu-, 90Y-, and 225Ac-labeled 3BP-3940: First experience in 21 different advanced malignancies. J Nucl Med. 2026;67(6):910-920. doi: 10.2967/jnumed.125.271129
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