BDKRB1 and squamous cell carcinoma: In agreement with our previous work we found higher constitutive expression of B1R in pulmonary adenocarcinoma cells (H2126, A549) and pulmonary fibroblasts (NHLF, HFLF) compared to normal bronchial epithelial cells (16HBE), while squamous cell carcinoma cells (H520) did not constitutively express B1R [34].