- Thymosin fraction 5 does not influence urinary tract carcinogenesis by phenacetin and N-butyl-N-(4-hydroxybutyl)nitrosamine in NON/Shi mice. Murai, T., Iwata, H., Mori, S., Hato, F., Kimura, S., Kinoshita, Y., Wada, S., Kishimoto, T., Makino, S., Oohara, T. Oncol. Res. (1995)