Furthermore, Kaplan-Meier analysis revealed that DDR1 expression was correlated with poor overall survival in oral cancer patients (n = 75) in our cohort (p = 0.0249; Fig. 1f) and in TCGA’s OSCC cohort (n = 163) (p = 0.0304; Fig. 1g). This evidence concerns the gene DDR1 and lip and oral cavity carcinoma.