Abstract
Introduction
Glioblastoma multiforme (GBM) is the most common primary intracranial malignancy; survival can be improved by maximizing the extent-of-resection.
Methods
A near-infrared fluorophore (Indocyanine-Green, ICG) was combined with a photosensitizer (Chlorin-e6, Ce6) on the surface of superparamagnetic-iron-oxide-nanoparticles (SPIONs), all FDA-approved for clinical use, yielding a nanocluster (ICS) using a microemulsion. The physical–chemical properties of the ICS were systematically evaluated. Efficacy of photodynamic therapy (PDT) was evaluated in vitro with GL261 cells and in vivo in a subtotal resection trial using a syngeneic flank tumor model. NIR imaging properties of ICS were evaluated in both a flank and an intracranial GBM model.
Results
ICS demonstrated high ICG and Ce6 encapsulation efficiency, high payload capacity, and chemical stability in physiologic conditions. In vitro cell studies demonstrated significant PDT-induced cytotoxicity using ICS. Preclinical animal studies demonstrated that the nanoclusters can be detected through NIR imaging in both flank and intracranial GBM tumors (ex: 745 nm, em: 800 nm; mean signal-to-background 8.5 ± 0.6). In the flank residual tumor PDT trial, subjects treated with PDT demonstrated significantly enhanced local control of recurrent neoplasm starting on postoperative day 8 (23.1 mm3 vs 150.5 mm3, p = 0.045), and the treatment effect amplified to final mean volumes of 220.4 mm3 vs 806.1 mm3 on day 23 (p = 0.0055).
Conclusion
A multimodal theragnostic agent comprised solely of FDA-approved components was developed to couple optical imaging and PDT. The findings demonstrated evidence for the potential theragnostic benefit of ICS in surgical oncology that is conducive to clinical integration.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
National Institutes of Health (R01EB029238 to A.T., R21 EB023989 to A.T., R01NS100892 to Z.C., R01CA175480 to Z.C., P01CA087971 to T.M.B., P30CA016520 to Z.C., T.M.B., and A.T., R01CA236362 to T.M.B.); National Center for Advancing Translational Sciences of the National Institutes of Health (UL1TR000003 to JYKL, TL1TR001880 to SS Cho); The U. of Penn. University Research Foundation Award to A.T.; Institute for Translational Medicine and Therapeutics of the Perelman School of Medicine at the University of Pennsylvania to JYKL;
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CWT and AA contributed equally to this work. CWT, AA, AT and JYKL designed the research; CWT, AA, SS Cho, SS Cai, EDR, YS performed the research; JM, S. Sheikh, ED, ZC, TMB, JFD, S Singhal supplied critical research resource and space; CWT, AA and SS Cho analyzed data; CWT and AA wrote the manuscript. All authors edited and reviewed the final manuscript.
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All animal procedus were conducted according to a protocol approved by the Institutional Animal Care and Use Committee at the University of Pennsylvania (#805979, #806516) and NIH and ARRIVE guidelines.
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Teng, C.W., Amirshaghaghi, A., Cho, S.S. et al. Combined fluorescence-guided surgery and photodynamic therapy for glioblastoma multiforme using cyanine and chlorin nanocluster. J Neurooncol 149, 243–252 (2020). https://doi.org/10.1007/s11060-020-03618-1
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DOI: https://doi.org/10.1007/s11060-020-03618-1