The correlation of PpIX concentration and relative mRNA levels of PEPT1, PEPT2, GAT2, TAUT, PAT1, ABCG2, ABCB6, HMBS, UROS, UROD, CPOX, FECH, and HO-1 in nine carcinoma cell lines (IUT, Jack, Gal, YDP, HDC, LuBi, JDM, FBC, and SNP) and six sarcoma cell lines (SGR, KLC, DML, YCC, ITP, and HTR) are shown in Figure 9 and Figure 10, respectively. The gene discussed is SLC15A2; the disease is sarcoma.