Correlation of intracellular PpIX concentration and relative mRNA levels in carcinomas. (a) Peptide transporter 1 (PEPT1), (b) peptide transporter 2 (PEPT2), (c) GABA transporter 2 (GAT2), (d) taurine transporter (TAUT), (e) H+/amino acid transporter 1 (PAT1), (f) ATP-binding cassette transporter G2 (ABCG2), (g) ATP-binding cassette transporter B6 (ABCB6, (h) hydroxymethylbilane synthase (HMBS), (i) uroporphyrinogen III synthase (UROS), (j) uroporphyrinogen III decarboxylase (UROD), (k) coproporphyrinogen oxidase (CPOX), (l) ferrochelatase (FECH), (m) heme oxigenase 1 (HO-1). Carcinomas: IUT (blue closed circle), Jack (blue open circle), Gal (blue closed triangle), YDP (blue open triangle), HDC (blue closed diamond), LuBi (blue open diamond), JDM (blue closed square), FBC (blue open square), and SNP (blue cross); Sarcomas: SGR (orange closed circle), KLC (orange open circle), DML (orange closed triangle), YCC (orange open triangle), ITP (orange closed square), and HTR (orange open square). Pearson’s correlation analysis (n = 9).