Nitrosylhemoglobin in photodynamically stressed human tumors growing in nude mice

- Nitrosylhemoglobin is produced in human tumors growing in nude mice.
- Photodynamic therapy with zinc pheophorbide caused effects on 76% of the tumors.
- Increased nitrosylhemoglobin level correlates with the efficacy of the photodynamic therapy.
- Increased nitrosylhemoglobin level reflects tissue infiltration by leukocytes.