PET Imaging Study of 68Ga-PFA2 Probe for Annexin A2-Positive Tumors

Description:

ANXA2 not only serves as a poor prognostic factor for various cancers but also holds potential as a therapeutic target. Several monoclonal antibodies targeting ANXA2 have shown significant antitumor and antiangiogenic effects. Rajkumar et al. demonstrated that the monoclonal antibody mAb150, targeting the N-terminal epitope of ANXA2, enhances cancer stem cells' re-entry into the cell cycle, reducing migration and EMT in activated cancer cells, ultimately inhibiting ascites formation and extending survival in a mouse ovarian cancer model. Another monoclonal antibody, ch2448, targets the unique glycan epitope of ANXA2, triggering antibody-dependent cell-mediated cytotoxicity, effectively inhibiting tumor formation and delaying or preventing teratoma development. In addition to large molecular antibodies, the first small-molecule inhibitor of ANXA2 in triple-negative breast cancer, 5α-epoxyalantolactone (5-EAL), has been discovered. 5-EAL selectively binds to the conserved cysteine residue of ANXA2, inhibiting the formation of the ANXA2-S100A10 heterotetramer complex, effectively suppressing TNBC proliferation and metastasis. These findings highlight the enormous diagnostic and therapeutic potential of ANXA2 as a biomarker for malignant cancers.