Determinants of variability of five programmed death ligand-1 immunohistochemistry assays in non-small cell lung cancer samples

RA Soo, JSY Lim, BR Asuncion, Z Fazreen, MC Herrera, MFM Omar, NHD Phuong, JE Seet, B Amanuel, B Iacopetta, D Byrne, S Hendry, S Fox, R Soong