Bladder Cancer
Conditions
Brief summary
The study aims to investigate alterations in the bladder microbiome in adult men with bladder cancer, healthy men, and men with benign urinary disease
Detailed description
The presence of diverse bacterial representations characterizes a healthy microbiome in both men and women. Differences in bacterial diversity and richness have been observed in subjects with bladder cancer. Investigating the complex relationship between the urinary microbiome and bladder cancer is imperative and requires extensive exploration. The urinary microbiome in patients with bladder cancer has shown high variability in results between studies. These differences may suggest an interaction with bladder tissue and a potential association; however, it is still unclear whether this association precedes or follows bladder cancer. Regarding phylum-level representations, an abundance of Proteobacteria and Corynebacterium, and a decreased abundance of the genera Ruminococcus and Bifidobacterium have been identified in patients with bladder cancer. The latter two are considered anti-inflammatory bacteria important for mucosal homeostasis. Furthermore, with regard to tumor grade, an increase in Veillonella has been reported in pTa/T1Hg, CIS and T2 tumors; Corynebacterium and Staphylococcus are increased in high-grade NMIBC and low-grade pTa tumors, respectively. The study aims to investigate possible differences in bacterial representations in patients with bladder cancer, patients with benign urinary diseases and healthy subjects. Furthermore, possible variations in bacterial profiles in patients with bladder cancer based on tumor stage will be investigated. differences in bacterial representations in patients with bladder cancer, patients with benign urinary diseases and healthy subjects. In addition to possible variations in bacterial profiles in patients with bladder cancer based on tumor stage.
Interventions
OTHERInvestigating differences in the bladder microbiome
Urine samples and tissue from radical cystectomy specimens will be analyzed for the assessment of the urinary microbiome. The 16s rRNA gene will be amplified and the resulting amplicons analyzed by Illumina sequencing. To distinguish contaminants, DNA from the sample will be quantified by qPCR and compared to a known urine sample of E. coli. DNA will be extracted using the Quiagen kit and stored at -20 °C until PCR amplification. Bacterial DNA will be amplified with specific primers covering the V1-V3 hypervariable region of the 16S rRNA gene. Libraries will be prepared using the Illumina 16S microbiome sequencing protocol, and their quality will be verified by Bioanalyzer and quantity by qPCR. Sequencing will be performed in paired-end mode on Illumina sequencers. Alpha, beta diversity and species richness will be measured.
Sponsors
Regina Elena Cancer Institute
Study design
Observational model
OTHER
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
MALE
Age
50 Years to 70 Years
Healthy volunteers
Yes
Inclusion criteria
(Bladder Cancer Patients): * Diagnosis of bladder cancer * Negative urine culture * Histological confirmation of urothelial carcinoma * Patients undergoing radical cystectomy
Exclusion criteria
* Presence of other neoplasias * History of previous BCG therapy * Use of indwelling catheter * Active antibiotic treatment with two months prior to participation * History of sexual transmitted diseases * Presence of chronic intestinal inflammation * Previous neoadyuvant therapy Inclusion Criteria Controls No-Pathologic/Healthy): \- Controls will be collected from men within the specified age range. Eligible controls may be drawn from the institution's personnel attending the occupational medicine department or in service in the Institute.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Differences in the bladder microbiome | 36 months | To investigate differences in the bladder microbiome in men with bladder cancer, healthy men, and men with benign urinary disease. The study involves collecting urine using a mid-stream clean-catch technique. Subsequent DNA extraction, sequencing, and identification will allow the study of the bacteria within the samples. In this way, variations in bacterial profiles between patients will be measured. |
Countries
Italy
Contacts
Primary ContactGiuseppe Simone, Doctor
Outcome results
None listed