MERTK and head and neck squamous cell carcinoma: In the univariate analysis no association of MERTK protein expression with prognosis was evident (Log rank p = 0.351) with 5-year survival rates of 51.2 % and 49.4 % for patients with no/low or medium/high MERTK protein expression, respectively for the Bonn HNSCC cohort (Figure 1C).