Skip to Main Navigation
Skip to Page Content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Testing Status of Toxic equivalency factor evaluation (PCB 153- 2,2'-4,4',5,5'-hexachlorobiphenyl) M960054


CASRN: 35065-27-1

Formula: C12-H4-Cl6

Synonyms/Common Names

  • 1,1'-Biphenyl, 2,2',4,4',5,5'-hexachloro- (9CI)
  • 2,2'-4,4',5,5'-hexachlorobiphenyl (PCB 153) (Toxic equivalency factor evaluation)
  • PCB 153 (Toxic equivalency factor evaluation)

Long-Term Carcinogenicity

  • 2 years (Gavage)  (C96021)  Completed 
    • TR-529 (NIH Number: 06-4465)  (Peer Review Approval 12/09/2004A )
      Toxicology and Carcinogenesis Studies of 2,2',4,4',5,5'-Hexachlorobiphenyl (PCB 153) (CASRN 35065-27-1) in Female Harlan Sprague-Dawley Rats (Gavage Studies)
    • Rats: Harlan Sprague-Dawley
    • Carcinogenesis Results
      • Female Rats Equivocal Evidence 
    • Dose: FEMALE RATS ONLY: PCB-153 -- 0, 10, 100, 300, 1000, OR 3000 UG/KG AND 3000 UG/KG (STOP-EXPOSURE); 50/DOSE.