Nutritional conditions and PFS and OS in cancer immunotherapy: the MOUSEION-010 meta-analysis

Background: The MOUSEION-010 Meta-Analysis assessed the association between nutritional status and clinical outcomes such as Progression Free Survival (PFS) and Overall Survival (OS) among cancer patients treated with immune checkpoint inhibitors (ICIs). Methods: Nutritional status was assessed based on the Prognostic Nutrition Index (PNI), Geriatric Nutritional Risk Index (GNRI) and Controlling Nutritional Status (CONUT) indexes. Databases consulted were: Embase, PubMed, Scopus and Web of Science. Results: PNI and GNRI indexes did not show a significant association with both PFS and OS, while CONUT index displayed a significant difference in PFS between the two groups, in favor of the control group (Z = 4.04; p < 0.01) also without any publication bias (β= −1.27; 95% CI = [−2.13; −0.42]; p = 0.10]). The same trend was recorded in OS, too (Z = 4.24; p < 0.01). However, publication bias was present (β = 1.89; 95% CI = [1.26; 2.54]; p = 0.028]) and the numerosity of the studies did not reveal the sufficient statistical power to obtain reliable results. Conclusion: Malnutrition could negatively impact cancer patients, especially in advanced phases. Our findings could be associated with the reduction of physical ability and daily activity performance, lower compliance with treatment protocols, and shorter survival outcomes.