Additionally, although no significant enrichment of glycolysis-related gene sets was revealed by GSEA, LDHA, which encodes a subunit of lactate dehydrogenase, a key enzyme in the glycolytic phenotype of cancer cells (known as the Warburg effect) [43] previously identified as a KLF4-repressed gene [44] was downregulated in the carfilzomib-resistant MM derivatives (Figure 3C). This evidence concerns the gene LDHA and cancer.