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Basic Sciences

Requirement of Essential Fatty Acid for Mammary Tumorigenesis in the Rat

Clement Ip, Christopher A. Carter and Margot M. Ip
Clement Ip
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Christopher A. Carter
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Margot M. Ip
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DOI:  Published May 1985
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Abstract

In an attempt to determine the requirement of essential fatty acid for dimethylbenz(a)anthracene-induced mammary tumorigenesis, rats were fed diets containing different levels of linoleate: 0.5, 1.1, 1.7, 2.2, 3.5, 4.4, 8.5, or 11.5%. Each diet contained 20% of fat by weight, with varying amounts of coconut oil and corn oil added to achieve the desired levels of linoleate. Mammary tumorigenesis was very sensitive to linoleate intake and increased proportionately in the range of 0.5 to 4.4% of dietary linoleate. Regression analysis indicated that a breakpoint occurred at 4.4%, beyond which there was a very poor linear relationship, suggesting the possibility of a plateau. From the intersection of the regression lines in both the upper and lower ranges, the level of linoleate required to elicit the maximal tumorigenic response was estimated to be around 4%. The differences in tumor yield could not be correlated with changes in prostaglandin E concentration in the mammary fat pads of normal animals maintained on similar diets, suggesting that linoleate may act by some other mechanism to stimulate mammary tumorigenesis.

Footnotes

  • ↵1 This work was supported by a grant from Best Foods/CPC International, Englewood Cliffs, NJ, and by Grant CA-33240 and Core Grant CA-24538 from the National Cancer Institute, NIH.

  • ↵2 To whom requests for reprints should be addressed.

  • Received August 16, 1984.
  • Revision received November 16, 1984.
  • Accepted January 31, 1985.
  • ©1985 American Association for Cancer Research.
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May 1985
Volume 45, Issue 5
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Requirement of Essential Fatty Acid for Mammary Tumorigenesis in the Rat
Clement Ip, Christopher A. Carter and Margot M. Ip
Cancer Res May 1 1985 (45) (5) 1997-2001;

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Requirement of Essential Fatty Acid for Mammary Tumorigenesis in the Rat
Clement Ip, Christopher A. Carter and Margot M. Ip
Cancer Res May 1 1985 (45) (5) 1997-2001;
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