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Nd:YAG laser-induced hyperthermia in a mouse tumor model
S M Waldow1, P R Morrison, L I Grossweiner
1Wenske Laser Center, Ravenswood Hospital Medical Center, Chicago.
Lasers in Surgery and Medicine
|January 1, 1988
Summary
1,064-nm radiation from an Nd:YAG laser can induce hyperthermic tumor response. While effective for small mammary tumors in mice, larger tumors showed no significant response to this laser-induced hyperthermia.
Area of Science:
- Oncology
- Biomedical Engineering
- Laser Physics
Background:
- Hyperthermia therapy uses heat to treat cancer.
- Nd:YAG lasers offer a potential tool for targeted hyperthermia.
- Understanding laser-induced hyperthermia efficacy is crucial for treatment development.
Purpose of the Study:
- To investigate the efficacy of 1,064-nm Nd:YAG laser radiation for inducing hyperthermic tumor response.
- To determine temperature-depth profiles achieved in tumors using this laser modality.
- To evaluate the complete response rates of mammary tumors of varying sizes.
Main Methods:
- Utilized a 1,064-nm Nd:YAG laser to induce hyperthermia in SMT-F mammary carcinoma in DBA/2J female mice.
- Measured temperature-depth profiles within tumors.
- Assessed complete tumor response rates over 5 weeks based on specific time-temperature parameters (45.0°C for 45 minutes).
Main Results:
- Achieved hyperthermic temperatures (≥45.0°C) in tumors (3-8 mm thick) with approximately 1 W power input.
- A 5-week complete response rate exceeding 50% was observed for smaller tumors under specific conditions.
- Failed to achieve significant tumor control in larger tumors (6-8 mm thick).
Conclusions:
- 1,064-nm Nd:YAG laser-induced hyperthermia shows potential for treating small SMT-F mammary tumors.
- Tumor size is a critical factor influencing the efficacy of this laser hyperthermia treatment.
- Observed response rates align with established time-temperature relationships for hyperthermia.