SFTPA2 and neoplasm: Among these, tumour foci No. 2 exhibited high expression of surfactant protein A2 (SFTPA2), surfactant protein A1 (SFTPA1), immunoglobulin lambda constant 7 (IGLC7), keratin 6A (KRT6A) and keratin 17 (KRT17) genes, whereas tumour foci No. 4 demonstrated high expression of cystatin SN (CST1), cartilage oligomeric matrix protein (COMP), collagen type 10 alpha 1 chain (COL10A1), matrix metallopeptidase 11 (MMP11) and periostin (POSTN) genes.