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Updated: Mar 17, 2026
A Model for Perineural Invasion in Head and Neck Squamous Cell Carcinoma
Published on: January 5, 2017
Skin cancer of the head and neck with gross or microscopic perineural involvement: Patterns of failure
Eli Sapir1, Anagha Tolpadi2, Jonathan McHugh3
1Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, United States.
Objectives:
Analyze patterns of failure of patients with head-and-neck cutaneous squamous cell carcinoma with perineural involvement: gross cranial nerve involvement (GCNI), microscopic focal perineural invasion (MFPNI), and microscopic extensive perineural invasion (MEPNI), managed with or without radiotherapy (RT).
Materials And Methods:
Retrospective review: 102 patients with GCNI, MFPNI and MEPNI, observed or treated with RT from 2000 through 2013. The pathology specimens were reviewed for the purpose of the study.
Results:
35 patients had GCNI, all irradiated definitely; 37% failed in-field, and two year disease free survival (DFS) rate was 56%. 19/30 patients (63%) with MEPNI without evidence of GCNI received adjuvant RT to the course of the nerves supplying the involved skin. Recurrence-free survival (RFS) in nerves (94% vs. 25%, P=0.01) and DFS (73% vs. 40%, P=0.05) were significantly higher in the irradiated MEPNI patients compared with the observed. 10/37 (27%) patients with MFPNI were irradiated adjuvantly. MFPNI had low rate of neural and overall failure, without significant benefit to irradiation over observation.
Conclusions:
In patients with GCNI radiotherapy achieves a substantial chance of disease control. Radiotherapy to nerves at risk in MFPNI did not affect outcome, but in MEPNI it achieved less gross perineural recurrences and better DFS, compared with observation.
Insights
Radiotherapy (RT) improves disease control for head-and-neck cutaneous squamous cell carcinoma with gross cranial nerve involvement (GCNI). For microscopic extensive perineural invasion (MEPNI), RT reduces recurrences and improves survival, unlike in microscopic focal perineural invasion (MFPNI).
Area of Science:
- Oncology
- Dermatology
- Radiation Oncology
Background:
- Head-and-neck cutaneous squamous cell carcinoma (HNCSSC) can involve cranial nerves, impacting prognosis.
- Understanding patterns of failure is crucial for optimizing treatment strategies.
Purpose of the Study:
- To analyze failure patterns in HNCSSC with perineural involvement (PNI).
- To evaluate the impact of radiotherapy (RT) on outcomes for different PNI classifications: gross cranial nerve involvement (GCNI), microscopic focal perineural invasion (MFPNI), and microscopic extensive perineural invasion (MEPNI).
Main Methods:
- Retrospective review of 102 patients with GCNI, MFPNI, or MEPNI treated between 2000-2013.
- Pathology specimen review to confirm PNI status.
- Comparison of outcomes between patients managed with or without RT.
Main Results:
- For GCNI, all patients received RT, with a 37% in-field failure rate and a 2-year disease-free survival (DFS) of 56%.
- In MEPNI, RT significantly improved recurrence-free survival (RFS) in nerves (94% vs. 25%) and DFS (73% vs. 40%) compared to observation.
- MFPNI showed low failure rates, with no significant benefit observed from adjuvant RT.
Conclusions:
- Radiotherapy is effective for achieving disease control in GCNI.
- Adjuvant RT in MEPNI reduces gross perineural recurrences and improves DFS, while it offers no significant benefit for MFPNI.
- RT plays a critical role in managing specific patterns of perineural invasion in HNCSSC.
