Abstract
Lymph node metastasis is a critical prognostic indicator for mortality in patients with cutaneous squamous cell carcinoma (SCC). To identify and characterize key risk factors for SCC lymph node metastasis. This was a multi-institutional, case-control study of 65 cutaneous SCCs with known lymph node metastasis matched with 195 cutaneous SCCs without lymph node metastasis (3:1 matching). The cases and controls were matched by anatomic location, age, and sex. Odds ratios (ORs) and their 95% confidence intervals (CIs) were generated to determine the association between specific risk factors and lymph node metastasis in a multivariate analysis. Recurrent tumors (p < .001), perineural invasion (p < .001), lymphovascular invasion (p = .002), size of 2 cm or greater (p = .008), and hypothyroidism (p = .03) were significantly more common in the lymph node metastasis cohort. Recurrence (OR 6.3, 95% CI 2.6-15.3), perineural invasion (OR 4.5, 95% CI 1.7-11.8), and hypothyroidism (OR 2.7, 95% CI 1.04-7.0) remained significant on performing a multivariate analysis. Lymph node metastasis in SCC is associated with recurrence, perineural invasion, lymphovascular invasion, size of 2 cm or greater, and hypothyroidism. Clinical consideration of these findings within the context of current staging systems may help improve patient outcomes.
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