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J Urol. 2010 Apr;183(4):1619-24. doi: 10.1016/j.juro.2009.12.003. Epub 2010 Feb 20.

Effect of isocaloric low fat diet on prostate cancer xenograft progression in a hormone deprivation model.

Author information

1
Department of Surgery, Durham Veterans Affairs Medical Center, Duke University School of Medicine, Durham, North Carolina, USA.

Erratum in

  • J Urol. 2010 Aug;184(2):808. Pollack, Michael [corrected to Pollak, Michael].

Abstract

PURPOSE:

Previous mouse studies suggesting that low fat diets slow prostate cancer growth often used corn oil (omega-6), which enhances prostate cancer growth, as the primary fat. Using a saturated fat based diet we previously found no significant difference in tumor growth between low and high fat fed SCID mice (Taconic Farms, Hudson, New York) xenografted with LAPC-4 cells. Whether similar results would hold in a castration model is unclear.

MATERIALS AND METHODS:

A total of 80 male SCID mice were fed a Western diet (40% fat and 44% carbohydrate) and injected with LAPC-4 human prostate cancer cells. When tumors were 200 mm(3), the mice were castrated and randomized to an isocaloric Western or a low fat diet (12% fat and 72% carbohydrate). Animals were sacrificed when tumors were 1,000 mm(3). Serum was collected and assayed for prostate specific antigen, insulin, insulin-like growth factor 1 and insulin-like growth factor binding protein 3. Tumors were assayed for total and phosphorylated Akt.

RESULTS:

Mouse weight was equivalent in the 2 groups. Overall dietary group was not significantly associated with survival (log rank p = 0.32). There were no statistically significant differences in prostate specific antigen (p = 0.53), insulin-like growth factor axis parameters (each p >0.05) or p-Akt-to-t-Akt ratios (p = 0.22) between the groups at sacrifice.

CONCLUSIONS:

In this xenograft model we found no difference in tumor growth or survival between low fat vs Western fed mice when the fat source was saturated fat. These results conflict with those of other studies in which corn oil was used to show that low fat diets delay prostate cancer growth, suggesting that fat type may be as important as fat amount in the prostate cancer setting.

PMID:
20172549
PMCID:
PMC3766524
DOI:
10.1016/j.juro.2009.12.003
[Indexed for MEDLINE]
Free PMC Article
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