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Study identifier: NCT06793137 Synced from ClinicalTrials.gov · July 28, 2026
● Recruiting

Intestinal Microbiome Modulation With Antibiotics in the Neoadjuvant Treatment of Locally Advanced Rectal Cancer

Condition: Rectal Cancer, Adenocarcinoma  ·  Sponsor: AC Camargo Cancer Center

PhasePhase 2
Planned participants100
Who can joinAll sexes, 18 Years to no upper limit
Healthy volunteersNo

About this study

Colorectal cancer is the second most common malignancy worldwide and one-third of these tumors are located in the rectum. The treatment may involve up to three modalities: radiotherapy, chemotherapy, and surgery. For several years, thanks mainly to Brazilian researchers, subgroups of patients have been selected for non-surgical treatment when chemoradiotherapy induces a complete clinical response. These treatment regimens have reached a plateau leading researchers to seek strategies that can increase response rates. Intestinal microbiota studies have shown that an overpopulation of certain anaerobic bacteria is generally associated with poorer treatment response. No study has attempted to intervene in the gut microbiota to increase the complete response rate in rectal cancer. The proposal of the investigators aims to modulate the intestinal microbiota through a phase 2 clinical trial, with the use of metronidazole as the intervention .

This description comes directly from the study's public registry record.

Talk to the study team

Samuel Aguiar Jr, MD, PhD  ·  + 55 (11) 2189-5010  ·  samuel.aguiar@accamargo.org.br

Virgilio S Silva, MD, PhD  ·  + 55 (11) 2189-5010  ·  virgilio.silva@accamargo.org.br

Always discuss trial participation with your own doctor first.

Locations (1)

A.C Camargo Cancer CenterSão Paulo, São Paulo, BrazilRecruiting

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Source record: clinicaltrials.gov/study/NCT06793137