Objective Our study aimed to evaluate the prognostic and clinicopathological significance of pretreatment mean platelet volume (MPV) on cancer by using meta-analysis of published studies. Design Meta-analysis. Data sources Relevant studies available before 22 December 2019 were identified by searching MEDLINE. EMBASE. https://www.roneverhart.com/Magic-Colors-Bubble-Gum-Crayons-Packs-24-Piece-Box/