Lymphatic vessel density is significantly increased in melanoma

Area of Science:

• Oncology
• Dermatopathology
• Vascular Biology

Background:

• Melanoma's early involvement of lymph nodes is known, but lymphangiogenesis presence is debated due to marker limitations.
• Investigating lymphatic vessel density (LVD) in melanocytic lesions requires specific markers.

Purpose of the Study:

• To determine intratumoral and peritumoral lymphatic vessel density (LVD) in melanocytic lesions.
• To compare LVD using the novel marker D2-40 against general vessel density (GVD) assessed by CD31.
• To evaluate the diagnostic potential of LVD in differentiating melanomas from nevi.

Main Methods:

• Immunohistochemistry was employed to examine melanocytic lesions.
• D2-40 (lymphatic-specific) and CD31 (general vasculature) antibodies were used.
• Intra- and peritumoral vessel densities were quantified.

Main Results:

• Intratumoral LVD was significantly elevated in melanomas compared to common acquired and dysplastic nevi (p < 0.01).
• Peritumoral LVD showed a trend towards higher density in melanoma and melanoma in situ versus nevi, but lacked statistical significance (p = 0.059).
• No significant differences in general vessel density (GVD) were observed across lesion types.

Conclusions:

• Intratumoral LVD is markedly increased in melanomas relative to benign nevi.
• Elevated intratumoral lymphatic density in invasive melanomas suggests a potential role for melanoma cells in promoting lymphangiogenesis.
• Assessing intratumoral LVD may offer utility in the differential diagnosis of melanocytic lesions.