Figure 2From: Zinc protoporphyrin IX, a heme oxygenase-1 inhibitor, demonstrates potent antitumor effects but is unable to potentiate antitumor effects of chemotherapeutics in mice The influence of Zn(II)PPIX on formation of tumor cell colonies. For the clonogenic assay, MDAH2774 or Mia PaCa2 cells were plated at a concentration of 1 × 103 cells/dish. Medium containing Zn(II)PPIX was replaced daily for 1–6 consecutive days. On day 14 after PDT, the plates were fixed with methanol and stained with crystal violet.Back to article page