Deciphering the Post-Operative Dynamics of Opportunistic Gut Microbiota in Colorectal Cancer Patients

Area of Science:

• Microbiology
• Oncology
• Gastroenterology

Background:

• Opportunistic gut bacteria are implicated in colorectal cancer (CRC) recurrence and chemoresistance.
• The behavior of these bacteria after surgical resection for CRC is not well understood.

Purpose of the Study:

• To investigate longitudinal changes in opportunistic gut bacteria following CRC surgery.
• To assess the persistence of these bacteria after tumor resection.

Main Methods:

• Collected fecal samples from 10 CRC patients at pre-surgery and at 1 week, 1 month, and 3 months post-surgery.
• Used 16S rRNA gene sequencing and quantitative PCR for microbial profiling.
• Compared patient samples to 15 healthy controls.

Main Results:

• Escherichia coli was enriched pre-surgery; Enterococcus faecalis predominated one week post-surgery.
• Opportunistic bacteria showed a gradual decline in relative abundance post-surgery.
• Beneficial bacteria like Akkermansia muciniphila and Bacteroides uniformis increased post-surgery, indicating potential dysbiosis restoration.

Conclusions:

• Surgical resection reduces opportunistic gut microbiota, potentially lowering CRC recurrence and chemoresistance risk.
• Surgery may promote the restoration of beneficial gut bacteria.
• Further studies with longer follow-up are needed to correlate findings with clinical outcomes.