Human gene therapy for melanoma: CT-guided interstitial injection

Area of Science:

• Oncology
• Gene Therapy
• Medical Imaging

Background:

• Metastatic malignant melanoma presents treatment challenges, necessitating innovative therapeutic strategies.
• Gene therapy offers a promising avenue for targeting cancer at the molecular level.
• Accurate delivery and monitoring are crucial for the success of gene-based cancer treatments.

Purpose of the Study:

• To evaluate the role of computed tomography (CT) in guiding intratumoral injections of Allovectin-7 for metastatic malignant melanoma.
• To assess the safety, accuracy, and efficacy of CT-guided gene delivery in patients with deep-seated or impalpable tumors.
• To monitor tumor response and gene expression following Allovectin-7 gene therapy.

Main Methods:

• Ten patients with metastatic malignant melanoma received CT-guided intratumoral injections of plasmid DNA encoding the HLA-B7 gene.
• Tumor locations included pulmonary, hepatic, adrenal, and other sites, with CT used for guidance and monitoring.
• Biopsy specimens and peripheral blood were analyzed to assess gene and protein expression and immune response.

Main Results:

• CT-guided injections successfully delivered genetic material to all targeted tumors, including impalpable lesions.
• Six out of ten patients demonstrated significant tumor responses, with one patient remaining disease-free for 19 months.
• HLA-B7 protein expression was detected in 89% of biopsy specimens, confirming successful gene product formation.

Conclusions:

• CT guidance is a safe, accurate, and effective tool for intratumoral gene therapy delivery and monitoring in metastatic melanoma.
• The observed significant responses in injected tumors warrant further clinical investigation of this gene therapy approach.
• CT-guided gene therapy holds potential for improving outcomes in patients with advanced melanoma.