https://ntp.niehs.nih.gov/go/10959

Target Organs and Levels of Evidence for TR-394

Toxicology and Carcinogenesis Studies of Acetaminophen (CASRN 103-90-2) in F344 Rats and B6C3F1 Mice (Feed Studies)

Chemical (Study Title)
CASRN		 Peer Review Date Route/Exposure Levels Study Laboratory
Acetaminophen (4-hydroxyacetanilide)
103-90-2		 11/19/1990 Dosed-Feed
R&M:0,.06,.3,.6%/60 PER GROUP		 T.S.I. Mason Laboratories, Inc.

Levels of Evidence

Male Rats: No Evidence
Type Organ/Tissue (Lesion)
Non-Neoplastic Lesions
  • KIDNEY: NEPHROPATHY; TUBULAR HYPERPLASIA
  • PARATHYROID GLAND: HYPERPLASIA
Female Rats: Equivocal Evidence
Type Organ/Tissue (Lesion)
Neoplastic Lesions
  • Hematopoietic System: MONONUCLEAR CELL LEUKEMIA 9/50 17/50 15/50 24/50
Non-Neoplastic Lesions
  • KIDNEY: NEPHROPATHY
Male Mice: No Evidence
Type Organ/Tissue (Lesion)
Non-Neoplastic Lesions
  • THYROID GLAND: FOLLICULAR CELL HYPERPLASIA
Female Mice: No Evidence
Type Organ/Tissue (Lesion)
Non-Neoplastic Lesions
  • THYROID GLAND: FOLLICULAR CELL HYPERPLASIA