NTRK1 and adenocarcinoma: TrkA immunoreactivity was low in normal lung tissue (h-score 18), and lower in adenocarcinoma (h-score 6) (p < 0.0001); in squamous cell carcinoma, TrkA intensity (h-score 26) was significantly higher (p < 0.0001) (Fig. 1G, Table 1).