The p53 gene like the Rb gene, is a tumor suppressor gene, and is known to contribute to stopping the formation of tumors (2). Cancer is known to be facilitated by loss of p53. Researchers found that mutant p53 had the expected oncogenic effect (a gene mutation that can lead to the growth of cancer cells). However, in the proximal gut and in tumour organoids it had a pronounced tumour-suppressive effect (based on mice studies).
In the tumour-suppressive mode, mutant p53 eliminated dysplasia and tumorigenesis. Researchers found that gallic acid reverses mutant-p53-induced WNT suppression and promotes dysplasia and tumorigenesis across the entire gut (2). Lactobacillus plantarum and Bacillus subtilis—have been identified as producers of gallic acid in humans (1). Primary gallate-decarboxylating microbial phyla in the intestinal microbiota are Firmicutes (74.6%), Proteobacteria (17.6%), and Actinobacteria (7.8%) (3).
3. https://aem.asm.org/content/84/19/e01558-18.short, and http://www.researchgate.net/publication/326662214_A_Diverse_Range_of_Human_Gut_Bacteria_Have_the_Potential_To_Metabolize_the_Dietary_Component_Gallic_Acid