MUC5B and idiopathic pulmonary fibrosis: Additionally, Stock et al. reported a slower decline in forced vital capacity (FVC) in IPF patients with the MUC5B variant [76]; however, contrasting findings were reported by Jiang and colleagues, who observed in a Chinese cohort that the T allele was associated with worse survival outcomes, along with a greater decline in FVC and Diffusion of Lung Carbon Monoxide (DLCO) [80].