Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12967-019-02182-1/MediaObjects/12967_2019_2182_Fig1_HTML.png)
Overall survival (OS) by PD-L1 expressiona. aPatients with PD-L1 result n = 396: a TC ≥ 25%, b TC ≥ 10%, and c TC ≥ 50%; d oropharynx anatomical sub-site (n = 91) by PD-L1 status
Overall survival (OS) by PD-L1 expressiona. aPatients with PD-L1 result n = 396: a TC ≥ 25%, b TC ≥ 10%, and c TC ≥ 50%; d oropharynx anatomical sub-site (n = 91) by PD-L1 status