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PGK2 (phosphoglycerate kinase 2) is a glycolytic enzyme that
catalyzes the reversible conversion of 1,3-bisphosphoglycerate to
3-phosphoglycerate while generating ATP. PGK2 is normally expressed primarily
in male germ cells and functions as a testis-specific counterpart of the
ubiquitously expressed PGK1. Aberrant PGK2 expression has been
reported in some cancers and may reflect activation of germ-cell or
cancer-testis transcriptional programs, but its direct contribution to tumour
metabolism and progression is substantially less established than that of PGK1.
Where tumour-cell PGK2 overexpression is demonstrated, it could increase
glycolytic ATP production and support proliferation; however, current evidence
does not justify assigning PGK2 a universal cancer-associated direction.
Therefore, its cancer modulation should be considered
context-dependent and recorded from the individual study.
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