Previously, tomato powder (TP) diets initiated postweaning have been shown to be effective
in reducing prostate cancer in the transgenic adenocarcinoma of the mouse prostate
(TRAMP) model. The TRAMP model develops and progresses through all stages of
carcinogenesis similarly to humans. We hypothesized that a 10% TP diet intervention
after puberty would reduce carcinogenesis at 12, 16, and 20 weeks of age in TRAMP mice.
Eight-week-old male C57BL/6 X FVB F1 TRAMP mice were randomized to consume either an
AIN-93G + 10% TP diet (n = 90) or the AIN-93G control diet (n = 88) and randomized to 1 of 3
end point ages: 12 (n = 59), 16 (n = 60), or 20 (n = 59) weeks of age. There was no difference
between diets in overall cancer incidence at any time point. However, at 16 weeks of age, TP
significantly increased high-grade PIN (P = .014) and significantly decreased poorly
differentiated (P = .024) lesions compared with the control diet suggesting a delay in the
progression of prostate cancer. Two variables that may explain the modest effect of TP in
this study are as follows: the low amount of lycopene in the TP diet (12.3 ppm) and the
timing of the intervention (8 weeks of age). The TP diet contained 30-fold less lycopene than
previous studies in our laboratory. In addition, the initiation of the diet intervention time of
8 weeks of age instead of 4 weeks of age may have been too late in cancer progression to
substantially impact carcinogenesis. In conclusion, a low-lycopene TP intervention failed to
reduce carcinogenesis in TRAMP mice
Previously, tomato powder (TP) diets initiated postweaning have been shown to be effectivein reducing prostate cancer in the transgenic adenocarcinoma of the mouse prostate(TRAMP) model. The TRAMP model develops and progresses through all stages ofcarcinogenesis similarly to humans. We hypothesized that a 10% TP diet interventionafter puberty would reduce carcinogenesis at 12, 16, and 20 weeks of age in TRAMP mice.Eight-week-old male C57BL/6 X FVB F1 TRAMP mice were randomized to consume either anAIN-93G + 10% TP diet (n = 90) or the AIN-93G control diet (n = 88) and randomized to 1 of 3end point ages: 12 (n = 59), 16 (n = 60), or 20 (n = 59) weeks of age. There was no differencebetween diets in overall cancer incidence at any time point. However, at 16 weeks of age, TPsignificantly increased high-grade PIN (P = .014) and significantly decreased poorlydifferentiated (P = .024) lesions compared with the control diet suggesting a delay in theprogression of prostate cancer. Two variables that may explain the modest effect of TP inthis study are as follows: the low amount of lycopene in the TP diet (12.3 ppm) and thetiming of the intervention (8 weeks of age). The TP diet contained 30-fold less lycopene thanprevious studies in our laboratory. In addition, the initiation of the diet intervention time of8 weeks of age instead of 4 weeks of age may have been too late in cancer progression tosubstantially impact carcinogenesis. In conclusion, a low-lycopene TP intervention failed toreduce carcinogenesis in TRAMP mice
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