SRC histology (univariate Cox HR, 1.83; 95% CI, 1.23 to 2.70; P = 0.003), age (univariate Cox HR, 1.03; 95% CI, 1.01 to 1.04; P < 0.001), perineural invasion (univariate Cox HR, 1.85; 95% CI, 1.32 to 2.60; P < 0.001), vascular invasion (univariate Cox HR, 2.84; 95% CI, 1.91 to 4.22; P < 0.001), advanced tumour grade, and increasing AJCC and tumour stages were significantly associated with relapse-free survival. Here, SRC is linked to neoplasm.