AGR2 and neoplasm: In these studies, quantitative reverse transcription polymerase chain reaction (qRT-PCR) (n = 2) or immunohistochemistry (IHC) staining (n = 16) was used to detect AGR2 expression in tumour tissue, while ELISA (n = 1) or qRT-PCR (n = 1) was employed to measure AGR2 expression in serum samples.