[Evaluation of inflammatory cells (tumor infiltrating lymphocytes - TIL) in malignant melanoma]

Area of Science:

• Oncology
• Immunology
• Pathology

Background:

• Tumor infiltrating lymphocytes (TIL) evaluation is vital for malignant melanoma prognosis.
• Current assessment methods, like the Clark system, are not optimal for TIL analysis.
• There is a need for improved, standardized methods for evaluating inflammatory infiltrates in melanoma.

Purpose of the Study:

• To review alternative methods for evaluating tumor infiltrating lymphocytes (TIL) in malignant melanoma.
• To discuss the prognostic and predictive significance of TIL determination.
• To highlight the importance of immunohistochemical subtyping of inflammatory infiltrate.

Main Methods:

• Overview of five distinct evaluation methods for TIL using hematoxylin-eosin staining.
• Inclusion of a recently proposed unified TIL evaluation method for solid tumors.
• Discussion of methodological considerations for TIL assessment.

Main Results:

• Current Clark method for TIL assessment in melanoma is suboptimal.
• Alternative hematoxylin-eosin based methods show potential for improved TIL evaluation.
• Unified TIL evaluation methods are being explored for broader application.

Conclusions:

• Standardized and optimized TIL evaluation is necessary for malignant melanoma biopsy examination.
• Further research into alternative TIL assessment methods is warranted.
• Immunohistochemical subtyping is important for a comprehensive understanding of inflammatory infiltrate.