The PCR array experiments allowed us to identify a cluster of 6 genes which in both SW620 and HepG2 cells appeared to be potentially regulated through the level of this metabolite: Proliferating Cell Nuclear Antigen (PCNA), Tumor Protein p73 (TP73), Replication Factor C subunit 4 (RFC4), Fanconi Anemia complementation group A (FANC-A), DNA Ligase 1 (LIG1), Glutathione S-Transferase π1 (GSTP-1). The gene discussed is GSTP1; the disease is Fanconi anemia complementation group A.