Occurrence of Spontaneous Tumors in the Central Nervous System (CNS) of F344 and SD Rats

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  • NAGATANI Mariko
    Hamamatsu Branch of Pathology Division, BOZO Research Center Inc., 164-2 Wada-cho, Higashi-ku, Hamamatsu, Shizuoka 435-0016, Japan
  • KUDO Kayoko
    Pathology Division, Gotemba Laboratories, BOZO Research Center Inc., 1284 Kamado, Gotemba, Shizuoka 412-0039, Japan
  • YAMAKAWA Seiki
    Hamamatsu Branch of Pathology Division, BOZO Research Center Inc., 164-2 Wada-cho, Higashi-ku, Hamamatsu, Shizuoka 435-0016, Japan
  • OHIRA Toko
    Hamamatsu Branch of Pathology Division, BOZO Research Center Inc., 164-2 Wada-cho, Higashi-ku, Hamamatsu, Shizuoka 435-0016, Japan
  • YAMAGUCHI Yuko
    Pathology Division, Gotemba Laboratories, BOZO Research Center Inc., 1284 Kamado, Gotemba, Shizuoka 412-0039, Japan
  • IKEZAKI Shinichiro
    Pathology Division, Gotemba Laboratories, BOZO Research Center Inc., 1284 Kamado, Gotemba, Shizuoka 412-0039, Japan
  • SUZUKI Isamu
    Pathology Division, Gotemba Laboratories, BOZO Research Center Inc., 1284 Kamado, Gotemba, Shizuoka 412-0039, Japan
  • SAITO Tsubasa
    Pathology Division, Gotemba Laboratories, BOZO Research Center Inc., 1284 Kamado, Gotemba, Shizuoka 412-0039, Japan
  • HOSHIYA Toru
    Pathology Division, Gotemba Laboratories, BOZO Research Center Inc., 1284 Kamado, Gotemba, Shizuoka 412-0039, Japan
  • TAMURA Kazutoshi
    Pathology Division, Gotemba Laboratories, BOZO Research Center Inc., 1284 Kamado, Gotemba, Shizuoka 412-0039, Japan
  • UCHIDA Kazuyuki
    Department of Veterinary Pathology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan

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Abstract

In order to accurately assess the carcinogenicity of chemicals with regard to rare tumors such as rat CNS tumors, sufficient information about spontaneous tumors are very important. This paper presents the data on the type, incidence and detected age of CNS tumors in F344/DuCrlCrlj (a total of 1363 males and 1363 females) and Crl:CD(SD) rats (a total of 1650 males and 1705 females) collected from in-house background data-collection studies and control groups of carcinogenicity studies at our laboratory, together with those previously reported in F344 and SD rats. The present data on F344/DuCrlCrlj rats (F344 rats) and Crl:CD(SD) rats (SD rats) clarified the following. (1) The incidences of all CNS tumors observed in F344 rats were less than 1%. (2) The incidences of malignant astrocytoma and granular cell tumor were higher in male SD rats than in female SD rats. (3) The incidences of astrocytoma and granular cell tumor were higher in SD rats than in F344 rats. (4) Among astrocytoma, oligodendroglioma and granular cell tumor, oligodendroglioma was detected at the youngest age, followed by astrocytoma, and ultimately, granular cell tumor developed in both strains. The incidences observed in our study were almost consistent with those previously reported in F344 and SD rats.

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