SFTPA1 and lung adenocarcinoma: More evidence concerning surfactant protein A in pulmonary cancer has been provided by Mitsuhashi et al. [21], who, using human lung adenocarcinoma (PC14PE6, A549) lines transduced with the SFTPA1 gene, demonstrated suppression of tumour progression in a murine model of subcutaneous xenografts or lung metastasis.