Kaplan–Meier overall survival and disease progression-free survival curves.

<p>(<b>A</b>) Overall survival rate for 674 patients with LSCC (<b>B</b>) Progression-free survival rate for 674 patients with LSCC. (<b>C</b>) Overall survival rate for HPV-positive (n = 33) and HPV-negative (n = 641) patients (P = 0.30). (<b>D</b>) Progression-free survival rate for HPV-positive (n = 33) and HPV-negative (n = 641) patients (P = 0.37).