This cluster of papers explores the metabolic reprogramming in cancer cells, focusing on the role of hypoxia-inducible factor 1 (HIF-1), the Warburg effect, tumor hypoxia, glutamine metabolism, and the impact of the tumor microenvironment on cancer cell metabolism. It also delves into oxygen sensing, mitochondrial metabolism, glycolysis inhibition, and the role of hexokinase II in cancer progression.