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Role of topical tretinoin in melanoma and dysplastic nevi
Abstract:
The retinoids have been investigated extensively as chemopreventive and therapeutic agents in a variety of neoplasms. They have been shown to inhibit the proliferation of transformed cell lines in vitro and transplanted tumors in vivo. In cultured murine melanoma cells, retinoids inhibit proliferation and induce differentiation. Human melanoma cell lines have shown a mixed response. The clinical experience with retinoids in melanoma has been limited. Previously we investigated the activity of topical B-all-trans-retinoic acid (Retin-A, vitamin A acid, retinoic acid, and tretinoin) against intracutaneous metastases from malignant melanoma. We saw complete remission of multiple lesions in one individual and regression of several lesions in a second patient. This experience led us to conduct the present pilot trial of topical tretinoin in dysplastic nevus syndrome. The latter is a precursor of malignant melanoma. We saw regression of some of the treated lesions to benign nevi showing minimal or no dysplasia. Thus topical tretinoin appears to possess some activity against melanoma and at least one of its precursor conditions. In view of these preliminary results, more extensive trials are warranted to better define the role of tretinoin in the chemoprevention of malignant melanoma in high-risk lesions.
Insights
Topical tretinoin showed activity against malignant melanoma and its precursor, dysplastic nevus syndrome. Further trials are needed to confirm its role in melanoma chemoprevention for high-risk lesions.
Area of Science:
- Dermatology
- Oncology
- Retinoid Research
Background:
- Retinoids are studied for cancer chemoprevention and therapy.
- They inhibit cancer cell proliferation and tumor growth.
- Previous studies showed retinoids' effects on melanoma cells, with mixed results in humans.
Observation:
- Topical all-trans-retinoic acid (tretinoin) was tested on melanoma metastases.
- Positive responses included complete remission in one patient and lesion regression in another.
- A pilot trial of topical tretinoin was conducted on dysplastic nevus syndrome, a melanoma precursor.
Findings:
- Topical tretinoin induced regression of some dysplastic nevi to benign lesions.
- The treatment demonstrated activity against melanoma and its precursor conditions.
- Preliminary results suggest potential chemopreventive effects of tretinoin.
Implications:
- Tretinoin shows promise in managing melanoma and its precursor lesions.
- More extensive clinical trials are warranted to establish tretinoin's role in melanoma chemoprevention.
- High-risk lesions may benefit from tretinoin treatment for preventing malignant melanoma.