Fig. 3
From: Impact of prior cancer history on the survival of patients with larynx cancer
Kaplan-Meier survival curves of prior cancer impact on the overall survival (OS) stratified by timing of prior cancer in patients with larynx cancer. a The OS analysis with time interval less than 12 months; b The OS analysis with time interval between 12 and 36 months; c The OS analysis with time interval between 36 and 60 months; d The OS analysis with time interval longer than 60 months