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Anatomical Targeting of Anticancer Drugs to Solid Tumors Using Specific Administration Routes: Review
Akira Saito1, Joji Kitayama1,2, Ryozo Nagai3
1Department of Surgery, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi 329-0431, Japan.
Abstract:
Despite remarkable recent progress in developing anti-cancer agents, outcomes of patients with solid tumors remain unsatisfactory. In general, anti-cancer drugs are systemically administered through peripheral veins and delivered throughout the body. The major problem with systemic chemotherapy is insufficient uptake of intravenous (IV) drugs by targeted tumor tissue. Although dose escalation and treatment intensification have been attempted in order to increase regional concentrations of anti-tumor drugs, these approaches have produced only marginal benefits in terms of patient outcomes, while often damaging healthy organs. To overcome this problem, local administration of anti-cancer agents can yield markedly higher drug concentrations in tumor tissue with less systemic toxicity. This strategy is most commonly used for liver and brain tumors, as well as pleural or peritoneal malignancies. Although the concept is theoretically reasonable, survival benefits are still limited. This review summarizes clinical results and problems and discusses future directions of regional cancer therapy with local administration of chemotherapeutants.
Insights
Local administration of chemotherapy offers higher drug concentrations in tumors than systemic delivery but survival benefits remain limited. Future research should focus on optimizing regional cancer therapy for better patient outcomes.
Area of Science:
- Oncology
- Pharmacology
- Cancer Therapy
Background:
- Systemic chemotherapy for solid tumors has limited efficacy due to insufficient drug uptake at the tumor site.
- Current strategies like dose escalation offer marginal benefits and increase systemic toxicity.
- Local administration presents a promising alternative to enhance drug concentration in tumors while minimizing side effects.
Purpose of the Study:
- To review the clinical outcomes of regional cancer therapy using local administration of chemotherapeutic agents.
- To identify the challenges and limitations associated with current local chemotherapy strategies.
- To discuss future directions for improving regional cancer treatment.
Main Methods:
- Review of clinical studies and literature on regional cancer therapy.
- Analysis of drug delivery methods and concentrations in tumor tissues.
- Evaluation of patient survival data and toxicity profiles.
Main Results:
- Local administration can achieve higher drug concentrations in target tumor tissues compared to systemic delivery.
- This approach has shown potential in treating liver, brain, pleural, and peritoneal malignancies.
- Despite improved drug delivery, significant survival benefits are yet to be consistently achieved.
Conclusions:
- Regional cancer therapy with local drug administration is a viable strategy to improve tumor drug concentrations and reduce systemic toxicity.
- Further research and optimization are crucial to translate the theoretical benefits into significant improvements in patient survival.
- Future directions may involve novel drug delivery systems and combination therapies for enhanced efficacy.
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