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Tumour relapse-free survival (TRFS) for T sites other than glottic larynx. Kaplan-Meier curves based on: (a) previous treatment; (b) grading; (c) fresh specimen evaluation; (d) microscopic state of definitive margin; (e) lymphovascular invasion; (f) TNM stage; (g) perineural invasion; (h) pT; (i) pathologic nodes with ECS.
