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Published on: March 18, 2014
Photochemical internalization as an adjunct to marginal surgery in a human sarcoma model
Ole-Jacob Norum1, Karl-Erik Giercksky, Kristian Berg
1Department of Radiation Biology, Institute for Cancer Research, Norwegian Radium Hospital, Montebello, N-0310 Oslo, Norway.
Summary
Photochemical internalization (PCI) of bleomycin effectively delayed tumor growth after inadequate surgery in a fibrosarcoma model. This cancer treatment strategy shows promise for eliminating residual tumor cells in the wound bed.
Area of Science:
- Oncology
- Photodynamic Therapy
- Surgical Oncology
Background:
- Local cancer recurrences post-surgery pose a significant clinical challenge.
- Photochemical internalization (PCI) enhances drug delivery by releasing endocytosed molecules into the cytosol.
- Previous studies showed limited efficacy of photochemical treatment on tumor periphery.
Purpose of the Study:
- To assess the efficacy of photochemical treatment alone and PCI of bleomycin on residual HT1080 fibrosarcoma tumors after marginal resection.
- To evaluate PCI as an intraoperative adjunct to surgery for eradicating remaining cancer cells.
Main Methods:
- Systemic administration of disulfonated aluminium phthalocyanine (AlPcS(2a)) and bleomycin prior to surgery.
- Intraoperative light exposure at 670 nm (15 J cm(-2)) following tumor resection.
- Comparison of tumor growth delay between photochemical treatment alone and PCI of bleomycin.
Main Results:
- Photochemical internalization (PCI) of bleomycin significantly delayed tumor regrowth compared to photochemical treatment alone.
- The combination therapy demonstrated enhanced efficacy in controlling residual tumor burden.
- The study highlights the potential of PCI in managing microscopic residual disease.
Conclusions:
- PCI of bleomycin is a promising intraoperative technique to address local recurrences after incomplete cancer surgery.
- This approach may improve outcomes for patients with residual tumor cells in the surgical wound bed.
- Further research is warranted to explore PCI's broader application in surgical oncology.
