Previous study has found that PEG feeding in malnourished patients with cystic fibrosis can improve nutritional status, and stabilize lung function, besides, it is suggested to be superior to using nasogastric tubes.20 In accordance with the findings above, our study indicated that PEG improved the nutritional status of the critically ill patients, manifesting as the increase of tricep skinfold thickness (Fig.2A) and serum albumin level (Fig.2B). The gene discussed is ALB; the disease is cystic fibrosis.