Basal cell carcinoma staging
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Basal Cell Carcinoma Staging Systems
Basal cell carcinoma (BCC) is the most common form of skin cancer, but unlike many other cancers, it does not have a universally accepted, simple staging system. Traditional tumor-node-metastasis (TNM) staging is not well-suited for BCC, as the disease rarely metastasizes and is more often classified by risk of recurrence or local aggressiveness rather than by spread to lymph nodes or distant organs 2310.
Brigham and Women's Hospital (BWH) and AJCC Staging
The Brigham and Women's Hospital (BWH) tumor classification system was developed to better identify BCC patients at risk for metastasis and death. Compared to the American Joint Committee on Cancer 8th edition (AJCC8) T-staging system, the BWH system captures all cases of metastasis and death in high T stages but does so with greater specificity and fewer cases being up-staged unnecessarily. For example, BWH T2 includes 54% fewer cases than AJCC8 T3/T4, yet still identifies all high-risk cases, making it more efficient for clinical decision-making and surveillance .
European and Operational Staging Proposals
European guidelines and expert groups have proposed operational classifications that divide BCCs into "easy-to-treat" and "difficult-to-treat" categories, based on clinical and pathological features. This approach is more practical for guiding treatment decisions and clinical trials, as it reflects real-world management challenges rather than strict anatomical staging 28. Experts have also agreed on a five-group classification for difficult-to-treat BCCs, based on patterns seen in challenging clinical situations .
Risk Stratification and Histopathological Classification
In the absence of a formal staging system, BCCs are often stratified by risk of recurrence or metastasis. Factors considered include tumor size, location, histological subtype, and whether the tumor is primary or recurrent. Histopathological classification—such as nodular, infiltrative, superficial, and mixed types—also helps predict the likelihood of complete excision and recurrence risk 348.
Advanced and Locally Advanced BCC
Locally advanced BCCs are defined as tumors that are not amenable to surgery or radiation therapy due to their size, location, or aggressive behavior. These cases require a multidisciplinary approach and may involve systemic therapies such as hedgehog pathway inhibitors or immunotherapy 6910. The distinction between "easy-to-treat" and "difficult-to-treat" BCCs is especially important for advanced cases, as it guides the use of specialized treatments and follow-up strategies 89.
Imaging and Technological Advances in Staging
Emerging imaging technologies, such as noninvasive imaging and hyperspectral microscopic imaging, are being explored to improve pre-surgical assessment and staging of BCC. These tools can help define tumor margins more accurately and may contribute to more precise risk stratification in the future 57.
Conclusion
Basal cell carcinoma staging is evolving from traditional TNM-based systems to more practical, risk-based, and operational classifications. The BWH system and European operational proposals offer improved specificity and clinical relevance, especially for identifying high-risk and difficult-to-treat cases. Risk stratification based on clinical and histopathological features remains central to guiding treatment and follow-up, while new imaging technologies may further refine staging and management in the future 1238+2 MORE.
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