Nanosecond pulsed electric fields cause melanomas to self-destruct.

Area of Science:

• Oncology
• Biophysics
• Dermatology

Background:

• Solid skin tumors present a significant clinical challenge.
• Current therapies may have limitations or side effects.
• A need exists for effective, localized, drug-free treatment options.

Purpose of the Study:

• To introduce a new drug-free therapy for solid skin tumors using pulsed electric fields.
• To investigate the mechanism of action and efficacy of this novel treatment.
• To evaluate the safety and localized effects on surrounding tissues.

Main Methods:

• Application of pulsed electric fields (PEFs) with specific parameters (e.g., >20 kV/cm, 30 ns rise time, 300 ns duration).
• Observation of cellular and vascular responses within tumors, including nuclear shrinkage and cessation of blood flow.
• Quantification of tumor volume reduction and assessment of treatment outcomes, including complete remission rates.
• Monitoring of temperature changes in the treated region to assess thermal effects.

Main Results:

• Pulsed electric fields effectively penetrate tumor cells, causing rapid nuclear shrinkage.
• Tumor blood flow was observed to stop following PEF application.
• Melanomas demonstrated a 90% reduction in size within two weeks after cumulative exposure.
• A second treatment achieved complete remission in some cases.
• The therapy exhibited highly localized targeting with minimal effects on overlying skin.
• Minimal temperature increase (3°C) was observed, well below hyperthermia thresholds.

Conclusions:

• Pulsed electric fields represent a promising new drug-free therapy for solid skin tumors.
• The mechanism involves direct cellular damage and vascular disruption.
• The treatment is localized, effective, and safe with minimal thermal side effects.
• Complete remission is achievable with repeated application.