An extract of Spirulina-Dunaliella algae was shown to prevent tumor development in hamster buccal pouch when a solution was applied topically three times weekly for 28 weeks. Untreated control animals all presented gross tumours of the right buccal pouch. Animals fed canthaxanthin presented a notably and statistically significant reduction in tumour number and size compared with controls. Animals fed beta carotene demonstrated a smaller but statistically significant reduction in tumor number and size. The algae animals presented a complete absence of gross tumors.
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