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https://ntp.niehs.nih.gov/go/10471

C.I. Pigment Red 23: Target Organs and Levels of Evidence for TR-411

Toxicology and Carcinogenesis Studies of C.I. Pigment Red 23 (CASRN 6471-49-4) in F344 Rats and B6C3F1 Mice (Feed Studies)

Chemical (Study Title)
CASRN		Peer Review DateRoute/Exposure LevelsStudy Laboratory
C.I. Pigment red 23
6471-49-4		03/11/1991Dosed-Feed
R&M: 0, 10000, 25000, 50000 PPM (60 PER GROUP)		Southern Research Institute

Levels of Evidence

Male Rats: Equivocal Evidence
TypeOrgan/Tissue (Lesion)
Neoplastic Lesions
  • Kidney Tubular Cell: ADENOMA 0/50 0/48 0/50 2/50 OR CARCINOMA 0/50 0/48 1/50 1/50 COMBINED 0/50 0/48 1/50 3/50
Non-Neoplastic Lesions
  • KIDNEY: RENAL TUBULE, HYPERPLASIA; INCREASED SEVERITY OF NEPHROPATHY
Other Considerations
  • HEMATOPOIETIC SYSTEM: MONONUCLEAR CELL LEUKEMIA 28/50 22/50 10/50 4/50
Female Rats: No Evidence
TypeOrgan/Tissue (Lesion)
Other Considerations
  • HEMATOPOIETIC SYSTEM: MONONUCLEAR CELL LEUKEMIA 14/50 7/50 3/50 3/50
Male Mice: No Evidence
TypeOrgan/Tissue (Lesion)
Non-Neoplastic Lesions
  • FORESTOMACH: HYPERKERATOSIS; EPITHELIUM, HYPERPLASIA
Female Mice: No Evidence
TypeOrgan/Tissue (Lesion)
Non-Neoplastic Lesions
  • FORESTOMACH: HYPERKERATOSIS; EPITHELIUM, HYPERPLASIA