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Trifanescu, O.G.; Trifanescu, R.A.; Mitrica, R.I.; Bran, D.M.; Serbanescu, G.L.; Valcauan, L.; Marinescu, S.A.; Gales, L.N.; Tanase, B.C.; Anghel, R.M. The Microbiome and Cancer Development. Encyclopedia. Available online: https://encyclopedia.pub/entry/42090 (accessed on 24 April 2024).
Trifanescu OG, Trifanescu RA, Mitrica RI, Bran DM, Serbanescu GL, Valcauan L, et al. The Microbiome and Cancer Development. Encyclopedia. Available at: https://encyclopedia.pub/entry/42090. Accessed April 24, 2024.
Trifanescu, Oana Gabriela, Raluca Alexandra Trifanescu, Radu Iulian Mitrica, Diana Maria Bran, Georgia Luiza Serbanescu, Laurentiu Valcauan, Serban Andrei Marinescu, Laurentia Nicoleta Gales, Bogdan Cosmin Tanase, Rodica Maricela Anghel. "The Microbiome and Cancer Development" Encyclopedia, https://encyclopedia.pub/entry/42090 (accessed April 24, 2024).
Trifanescu, O.G., Trifanescu, R.A., Mitrica, R.I., Bran, D.M., Serbanescu, G.L., Valcauan, L., Marinescu, S.A., Gales, L.N., Tanase, B.C., & Anghel, R.M. (2023, March 10). The Microbiome and Cancer Development. In Encyclopedia. https://encyclopedia.pub/entry/42090
Trifanescu, Oana Gabriela, et al. "The Microbiome and Cancer Development." Encyclopedia. Web. 10 March, 2023.
The Microbiome and Cancer Development
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This entry is adapted from the peer-reviewed paper 10.3390/diagnostics13050877
Changes in the microbiome also induce complex changes in human cells. From a biological perspective, the normal cervicovaginal microbiome is composed mainly of Lactobacillus spp., thus exhibiting low bacterial diversity and protecting against carcinogenesis through various mechanisms. The lactobacilli secrete lactic acid, and the low vaginal pH promotes healthy local homeostasis. The lactobacilli also secrete cytokines, antimicrobial peptides, and other metabolites that protect the local epithelium. They promote a healthy level of physiological inflammation that stimulates the immune system to fight against pathogens. On the other hand, the dysbiotic cervicovaginal microbiome exhibits a high diversity of microorganisms, primarily obligate and strict anaerobes, that lead to a high vaginal pH. The bacteria promote the disruption of the epithelial barrier and secrete various metabolites and enzymes such as sialidase, proinflammatory cytokines and chemokines, reactive oxygen species, and other carcinogenic metabolites that lead to chronic inflammation and a dysregulated local metabolism. Further down the line, they also lead to genotoxicity and genomic instability, as well as altered proliferation and altered apoptosis. The dysbiotic environment also promotes angiogenesis. The chronic inflammation activates immune cells that secrete even more proinflammatory cytokines and chemokines such as Interleukin (IL)-6, IL-8 or Tumor necrosis factor (TNF), resulting in even more reactive oxygen species that further promote carcinogenic mechanisms. Hence, there are many different mechanisms through which the microbiota can impact carcinogenesis.
microbiome tract immunotherapy

1. The Microbiome and Endometrial Cancer

Whereas the most common gynecological cancer in developing countries is cervical cancer, because of high rates of Human Papilloma Virus (HPV) infection and low rates of vaccination, the most common gynecological cancer in developed countries is endometrial cancer [1]. Many factors are associated with endometrial cancer, including high estrogen levels, obesity, chronic inflammation, and post-menopausal hormonal therapy.
The gut microbiome and the circulating estrogen levels are intensively connected as a feedback loop, influencing each other. Researchers can hypothesize that the gut microbiome, the estrobolome in particular, has a part to play in the development of endometrial cancer, but more research is needed. Moreover, estrogen metabolism and the gut and vaginal microbiome are influenced by obesity. There is an association between the body mass index, the estrogen metabolism and the composition of the vaginal and gut microbiome [1][2].
A high vaginal pH is correlated with endometrial cancer, usually due to a disbalance of the vaginal flora. For instance, recent studies showed that Atopobium vaginae and Porphyromonas among other bacteria that raise the vaginal pH are more prevalent in the vaginal flora of women with endometrial hyperplasia or endometrial cancer [3]. It is believed that this promotes chronic endometrial inflammation that turns on the carcinogenesis process [1].

2. The Microbiome and Ovarian Cancer

Ovarian cancer is a relatively rare tumor with a bad prognosis since it develops inconspicuously with no symptoms until the late stages.
Genital dysbiosis has been associated with ovarian cancer, although more research is needed to draw causality conclusions [4]. Sexually transmitted bacteria such as Chlamydia spp. and Mycoplasma spp. that cause chronic reproductive tract inflammation have been associated with ovarian cancer. For instance, more than 60% of ovarian tumors contain such intracellular bacteria [1]. Other microorganisms associated with ovarian cancer are Proteobacteria, Acinetobacter spp., Brucella and even viruses such as cytomegalovirus or HPV [1][5][6].
Lactobacilli species in the cervicovaginal part of the genital tract have a protective role against ovarian cancer [7]. BRCA mutation carriers are associated with a reduction in Lactobacillus spp. This association is more substantial in younger patients [8].
An increase in Proteobacteria and Fusobacteria characterizes the microbiome in the tumor tissue compared to normal tissue; these gram-negative bacteria make the microbiome more immunogenic [9][10][11].
Pelvic inflammatory disease is a risk factor for ovarian cancer [1][12][13][14]. Bacterial flagellin and lipopolysaccharide (LPS) have an essential role in driving inflammation in ovarian cancer by inducing a response in pattern recognition receptors TLR2, 4, and 5 [9][15][16][17][18][19][20][21][22], leading to activation of NF-kappa B signaling [10]. LPS stimulate cancer cells inducing PI3K activation, EMT and overexpression of Vimentin, Snail, α-SMA, TCF, MMP2, N-cadherin, Slug, and MMP9 [21]. Even though LPS activates tumoral-associated macrophages, pushing them towards the M1 profile [23][24] and making them cytotoxic and cytostatic for ovarian cancer cells [25], a recent study has shown that administration of LPS does not prolong and may even shorten survival [26].
The increase in Gram-negative bacteria leads to an increase in lysophospholipids, which are by-products of bacterial metabolism [27][28]. Lysophosphatids are similar to lysophospholipids; in ovarian cancer patients, lysophosphatids plasma levels are increased [29][30]. In ovarian cancer cells, lysophosphatidic acid can increase the expression of angiogenesis promoters [31] and induce cell migration, invasion and proliferation [32][33][34][35][36][37][38]. 
Bacteria metabolize tryptophan, producing indole-derivatives [39][40][41][42][43][44], which act on the aryl hydrocarbon and pregnane X receptors [45][46][47]. Aryl hydrocarbon receptor is involved in immune regulation [44][48]. Tryptophan rich diet leads to the proliferation of Lactobacilli [45], which prevents the proliferation of pathogenic bacteria [45][49][50][51]. Tryptophan and indolepropionic acid levels are reduced in the serum of ovarian cancer patients [52][53][54][55][56] and are inversely correlated with the stage of the disease [56].
Antibiotics (glycylcyclines, erythromycins, tetracyclines and chloramphenicol) can block cellular proliferation and reduce the proportion of ovarian stem cells [57]. Minocycline [58][59][60][61], Ciprofloxacin [62], and Salinomycin [55][63][64][65][66][67][68] can reduce the proliferation rate of ovarian cancer cells. In murine models, antibiotics can also be used to prevent cisplatin resistance [69], and minocycline can potentiate the activity of topoisomerase inhibitors [70].
Even though many studies suggest a potential benefit of antibiotic therapy, there is a study in which the treatment of mice grafted with ovarian cancer with neomycin, ampicillin, vancomycin, and metronidazole was associated with increased invasiveness and growth of the grafts [71].

3. The Microbiome and Cervical Cancer

Cervical cancer is a common malignancy in women, especially in developing countries where the HPV vaccination rate is low. Over 99% of cervical cancer biopsies contain HPV Deoxyribonucleic acid (DNA) as determined by Polymerase chain reaction (PCR) [1][72]. HPV is the major carcinogenic factor in the evolution of cervical cancer through the expression of E6 and E7 proteins. The most high-risk genotypes are HPV 16 and HPV 18. However, it is essential to note that 85–90% of HPV infections with high-risk genotypes are spontaneously cleared [1]. The high-risk HPV infections that persist can, in time, lead to cervical intraepithelial neoplasia (CIN)—low grade and then high grade—and then progress to invasive cervical cancer.
HPV-negative women have been shown to host mainly Lactobacillus crispatus and Lactobacillus iners. However, HPV-positive women with a normal cervix contain the two lactobacillus species in different proportions. The risk of cervical transformation is higher with Lactobacillus iners than with Lactobacillus crispatus [73]. Once the HPV infection progresses toward cervical intraepithelial neoplasia, the cervicovaginal bacterial diversity increases correspondingly. The Lactobacillus spp is depleted, and the vaginal pH is elevated. The highest diversity is found in invasive cervical cancer (Fusobacterium necrophorum, Gardnerella vaginalis, Sneathia etc.) [1][73][74].
Various studies have shown that vaginal Sneathia associates with HPV persistence and pathological progression to cancer. Atopobium spp. is also associated with HPV persistence [75].
Other organisms that have been shown to influence the transformation of HPV lesions are Candida albicans, Chlamydia trachomatis and Ureaplasma urealyticum [1].
The increase in the diversity of the microbial flora leads to the production of cytokines which amplify the inflammatory response [73][76][77][78], leading to immune dysregulation in the reproductive tract and thus creating a more suitable site for tumor development [79].
Mycoplasma genitalium causes bacterial cervicitis and vaginitis, increasing the incidence of cervical lesions [80][81]. Chlamydia trachomatis damages the cervical mucosa and promotes infection of the cervical epithelium by HPV [82][83]. 
Fusobacterium leads to increased production of interleukin-4, interleukin-10 and TGF- beta1 in the cervix and vagina; these cytokines are also increased in cervical cancer and squamous intraepithelial disease [84].

4. Interaction between Cancer Treatment and the Microbiome

The main pillars of cancer treatment are surgery, radiotherapy, chemotherapy, targeted molecules, and immunotherapy. This part of the article explores the interaction between cancer treatment and the microbiome. Researchers will summarize what is known on the female reproductive tract microbiome, and in addition researchers will also explore the gut microbiome. The gut microbiome is much more investigated, and researchers hope that these insights will lead to new interesting research projects on the female reproductive tract microbiome as well.
Moreover, understanding the gut microbiome is important because a lack of oestrogen-metabolizing bacteria (from a lower diversity of the gut microbiota after chemotherapy for instance) could influence the vaginal microbiome composition. Therefore, strategies targeted towards the gut microbiome might have an indirect effect on the vaginal microbiome as well.
It is well-known that both radiotherapy and chemotherapy can cause gut mucositis and diarrhea. They also decrease the diversity of the gut microbiome, which is usually linked to digestive tract side effects. In contrast, radiotherapy and chemotherapy seem to increase bacterial diversity of the female reproductive tract, and increased bacterial diversity is a sign of disease, as previously explained.
Immunotherapy has emerged as a treatment in multiple types of cancer in recent years. Regarding gynecological cancers, it is of interest especially in patients with MSI-H endometrial, cervical, and ovarian cancer. Not much is yet known about the effects of immunotherapy such as Nivolumab, Ipilimumab and Pembrolizumab on microbiomes. However, researchers can hypothesize that there is an interesting interplay between immunotherapy and microbiomes since they both act on and modulate the immune system. More research is needed in this direction.
Some specific bacteria-like microorganisms, such as Bifidobacterium longum, Ruminococcaceae and Akkermansia muciniphila were found to be more abundant in fecal samples collected from PD-1-responding patients. Oral supplementation with Akkermansia muciniphila proved beneficial in restoring response to immunotherapy in mouse models of epithelial tumors. The authors noticed an increase in the recruitment of CCR9+, CXCR3+, CD4+ T lymphocytes [85]. Proposed mechanisms involve the production of short-chain fatty acids and their pro-apoptotic role in cancer cells through activation of p21 cell cycle inhibitor and specific caspases, but also activation of the mTOR-S6K and STAT3 pathways in T-cells [86]. Administration of an oral cocktail of live Bifidobacterium to tumor-bearing mice significantly improved tumor control for several weeks. The same mice presented elevated levels of tumor-specific T cells in the periphery and antigen-specific CD8+ T cells within the tumor. Authors noticed a lack of anti-tumor effect in immunodeficient mice or mice treated with previously heat-inactivated Bifidobacterium [87]. Opposite results come from the study of Kim et al., who expanded on parabiotics as non-viable microbial cells in the form of heat-killed Bifidobacterium or Lactobacillus. These strains induced apoptosis of human colorectal carcinoma RKO cells in vitro and also revealed anti-tumor effects in an RKO cell-derived xenograft model through the activation of caspase-9, 3, 7 and PARP [88].
Interestingly, antibiotics seem to decrease immunotherapy’s efficacy, suggesting a link between these novel treatments and the microbiomes. Antibiotics also seem to increase the toxicity of chemotherapy. Moreover, radiotherapy, chemotherapy and immunotherapy are all less efficient in a germ-free mouse; fecal-matter transplantation and probiotics have been shown to improve the efficacy of immunotherapy [1][89][90][91][92].
The gut microbiota may be involved in the prevention of chemotherapy-associated toxicity, improved efficacy of oncologic treatment, prevention of surgical morbidity, and quality of life. Diarrhea, abdominal pain, vomiting, and weight loss are critical adverse reactions to chemotherapy that cause significant morbidity. Preventive intervention on the gut microbiota can influence the pathogenesis of mucositis through TLR2 signaling, mediation of vitamin B production, and microbial enzymatic degradation. Additionally, prognostic markers can be derived from specific microbiota patterns. The bowel mucosa load with Fusobacterium nucleatum strains correlates with worse prognostic in patients with colorectal cancer [91].
Modulating microbiomes had essential health benefits in many chronic and inflammatory diseases, including irritable bowel syndrome and recurring Clostridioides difficile infections and implications in cancer prevention and response to treatment.
Gut microbiota modulation is represented by probiotics, prebiotics, antibiotics or other drugs, or microbiota transplantation [93].
Bifidobacterium and Bacteroides species have been associated with immune modulation and estrogen metabolism and are under investigation for preventing estrogen-derived cancer such as breast, endometrial, and ovarian cancer [1]. Probiotics containing Lactobacillus lactis engineered to secrete an antimicrobial peptide involved in gut homeostasis (pancreatitis-associated protein) proved to reduce enteritis induced by 5-Fluorouracil in cancer patients. The mechanism was represented by a reduced abundance of pathogenic bacteria such as Enterobacteriaceae in the intestine, thus reducing the intensity of mucositis [94]
Fecal microbiota transplantation reduced the side effects generated by chemotherapy and radiotherapy [95]. However, the most important studies are related to fecal microbiota transplantation from responders to germ-free mice with xenograft tumors (melanoma, lung or kidney) which showed an increased response to checkpoint inhibitors [96].
Approaches for modulating vaginal microbiomes are under investigation. They aim to modify vaginal microbiota to optimal Lactobacillus-dominant flora to prevent carcinogenesis and in cancer patients to increase the effectiveness of treatments and decrease toxicity. Novel antimicrobials and probiotics such as intravaginally delivered vaginal lactobacilli formulations, biofilm disruptors, and vaginal microbiota transplantation are being considered.
Vaginal probiotic lactobacilli (L. crispatus strain CTV-05 known as LACTIN- V) have been tested with success in clinical trials, mainly for the treatment of bacterial vaginosis or urinary tract infection (UTI) [97][98].
Vaginal microbiota transplantation (VMT) from donors with optimal vaginal flora is a novel potential treatment option under investigation for women with vaginal disorders. However, there is an unknown long-term risk of microbiome transplants (fecal or vaginal) related to the potential transfer of antimicrobial-resistant microorganisms, which may be problematic in immunodepleted cancer patients.
Probiotics consisting of Lactobacillus spp. might aid in the treatment of cervicovaginal dysbiosis and persistent HPV infections [99][100]. Lactobacillus spp. probiotics might increase the clearance of HPV when used long-term in certain patients [100][101]. Since it is well established that persistent HPV infections increase the risk of cervical cancer, Lactobacillus spp. probiotics might be considered in HPV positive patients. However, more research is needed before establishing clear links and then guidelines.
A study conducted by Tsementzi et al. showed that radiation therapy alone in post-menopausal patients with gynaecologic cancer leads to a perturbation of the vaginal microbiome with a decrease of Lactobacillus spp. The study showed a higher vaginal bacterial diversity in cancer patients with respect to healthy patients and a higher vaginal bacterial diversity in post-radiotherapy with respect to pre-radiotherapy. This might be associated with some post-radiotherapy symptoms in patients with vulvovaginal atrophy and these findings might have implications for future therapeutic interventions, such as probiotics or vaginal microbiome transplantation [102].
Overall, not much is known about the female reproductive tract microbiome and its changes during cancer treatment, and even less is known on the influence of the female reproductive microbiome on the response to various treatments.

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Subjects: Primary Health Care
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Oana Gabriela Trifanescu
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Raluca Alexandra Trifanescu
,
Radu Iulian Mitrica
,
Diana Maria Bran
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Georgia Luiza Serbanescu
,
Laurentiu Valcauan
,
Serban Andrei Marinescu
,
Laurentia Nicoleta Gales
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Bogdan Cosmin Tanase
,
Rodica Maricela Anghel
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Update Date: 13 Mar 2023
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