Lynch Syndrome X-Talk of Enteral Mucosa With Immune System (LYNX-EYE)

April 21, 2026 updated by: San Raffaele University

Impact of Immune-surveillance on the Development of Colorectal Cancer in Patients With Lynch Syndrome

Lynch syndrome (OMIM #120435) is the most common dominantly inherited colorectal cancer syndrome with an estimated prevalence of 1:270 individuals. It increases the lifetime risk of colorectal and endometrial cancer primarily, but it is associated with a high risk of other cancers (pancreas, stomach, ovarian, central nervous system, skin, among others). It is caused by a germline mutation in one of four DNA mismatch repair genes or a terminal deletion of the MSH2-adjacent gene EpCAM.

Despite adherence to cancer surveillance programs, many patients still develop colorectal cancer and endometrial cancer. The Prospective Lynch Syndrome Database (PLSD) suggests that more frequent surveillance intervals do not significantly improve cancer risk reduction. The PLSD also revealed that the incidence of colorectal cancer in MLH1 and MSH2 carriers was even higher than previously expected, reaching as high as 41-36% among MLH1 carriers, regardless of ethnic background. The development of colorectal cancer despite surveillance is an unresolved question. Therefore, there is an unmet need for effective cancer prevention strategies.

Study Overview

Detailed Description

The risk of developing colorectal cancer in individuals with Lynch syndrome remains high despite endoscopic surveillance.

In Lynch Syndrome, the cancer-formation process is characterized by the development of immunogenic neo-antigens in the mucosa. These neoantigens, called frame-shift peptides, can be recognized by the adaptive immune systems, and trigger the formation of antibodies against them (termed anti-frame-shift peptides antibodies). Anti-frame-shift peptide antibodies have been reported in some Lynch syndrome patients (defined dichotomously as the presence vs absence of anti-frame-shift peptide antibodies). This study hypothesizes that anti-frame-shift peptide antibodies represent an early biomarker of cancer development in Lynch syndrome. These anti-frame-shift peptide antibodies may be used to identify early patients at the highest risk of developing colorectal cancer. All studies on anti-frame-shift peptide antibodies have had a cross-sectional design, while a retro-prospective design would be desirable to understand the interaction between the mucosa and the mucosa-associated immune system. There is also limited evidence that individuals with Lynch syndrome develop mismatch repair-deficient crypts before colorectal cancer development. The development of interval colorectal cancers may require specific biological processes. Understanding the biological processes underlying these interval colorectal cancers would help define targets of innovative therapies to prevent colorectal cancer (including but not limited to chemoprevention strategies and cancer vaccines). The interactions between the mucosa immune surveillance and the colonic epithelium are the cornerstone to answer such questions. Finally, the development of gastric cancer via non-canonical pathways (non-Correa, non-HPylori) demands a better understanding of the pathogenesis in individuals with Lynch syndrome.

MicroRNA (miRNA) expression has been shown to have diagnostic, prognostic, and therapeutic potential. While they offer high detection sensitivity, the heterogeneity limits their detection accuracy. Exosomes are excreted by cancer cells and possess specific exosomal miRNA signatures. Since circulating cell-free miRNAs offer excellent sensitivity but may suffer from inadequate specificity, while exosomal miRNAs are highly tissue-specific but might lack sensitivity, a combination of these biomarkers could offer an optimal combination of sensitivity and specificity. 98.5% of the total DNA is non-coding regions with roles in gene regulation, alternative splicing, interaction with transcription factors, and sequences capable of moving around the genome and promoting carcinogenesis. The understanding of non-coding DNA seems to be important in cancer early diagnosis.

Lynch syndrome-associated colorectal cancers are high immunogenic lesions with abundant lymphocyte infiltration. This study aims to develop an extensive profile of the immunosuppressive and regulatory cellular population in blood and tumor sites to identify patients with higher risks of cancer development.

Recent data have demonstrated the presence of intratumor bacteria in both cancer and immune cells. Therefore, this study also aims to analyze in colonic biopsies from Lynch syndrome patients with- and without tumors the presence of microbiota as an early signature for carcinogenesis.

Study Type

Observational

Enrollment (Estimated)

300

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

      • Cagliari, Italy
        • Recruiting
        • Chirurgia Generale, Azienda Ospedaliero Universitaria di Cagliari
        • Contact:
          • Angelo Restivo, MD
        • Contact:
          • Giulia Anna Maria Luigia Costanzo
    • Lombardy
      • Milan, Lombardy, Italy, 20132
        • Recruiting
        • Gastronterology and Gastrointestinal Endoscopy Unit, IRCCS San Raffaele Hospital
        • Principal Investigator:
          • Alessandro Mannucci, MD
        • Contact:
        • Principal Investigator:
          • Marta Puzzono, MD, PhD
        • Principal Investigator:
          • Clelia Di Serio, PhD
        • Sub-Investigator:
          • Chiara Brombin, PhD
        • Sub-Investigator:
          • Paola MV Rancoita, PhD
        • Principal Investigator:
          • Claudio Doglioni, MD, PhD
        • Sub-Investigator:
          • Luca Albarello, MD
    • MI
      • Milan, MI, Italy
        • Recruiting
        • Dipartimento di Chirurgia Oncologica e Dipartimento di Oncologia Sperimentale Istituto Nazionale Tumori
        • Contact:
          • Marco Vitellaro, MD
        • Contact:
          • Elena Daveri
    • PM
      • Palermo, PM, Italy
        • Recruiting
        • Dipartimento di controllo qualità e rischio chimico biologico, AOOR Villa Sofia Cervello
        • Contact:
          • Francesca Di Gaudio, MD
    • California
      • Monrovia, California, United States, 91016
        • Recruiting
        • Beckman Research Institute at City of Hope
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

N/A

Sampling Method

Non-Probability Sample

Study Population

This study will enroll patients with and without Lynch syndrome, with and without colorectal cancer or colorectal adenomas.

Description

Inclusion Criteria (for participants with Lynch syndrome):

  • Age ≥18 years
  • All sexes eligible
  • Established diagnosis of Lynch syndrome performed as part of clinical practice, with a germline pathogenic/likely pathogenic variant in one of the following genes: MLH1, MSH2, MSH6, PMS2, and EpCAM
  • Subjects with Lynch syndrome undergoing surveillance gastrointestinal endoscopy and/or surgery according to clinical practice
  • Fertile patients (both males and females) are eligible
  • Lactating women are eligible

Inclusion Criteria (for participants without Lynch syndrome):

  • Age ≥18 years
  • All sexes eligible
  • Patients with sporadic colorectal lesions, including colorectal cancer and colorectal adenomas
  • Healthy controls without colorectal cancer or adenomas undergoing lower gastrointestinal endoscopy for abdominal pain
  • PREMM5 < 2.5 [PREMM5 is an online, free-to-use, clinical prediction algorithm that estimates the cumulative probability of an individual carrying a germline mutation in the mismatch repair genes responsible for Lynch syndrome].

Exclusion Criteria (for participants with or without Lynch syndrome):

  • Age < 18 years;
  • Diseases that are known to predispose to colorectal cancer (personal past or recent history of inflammatory bowel disease);
  • Patients unable/unwilling to provide consent;
  • Pregnancy

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Lynch syndrome (MLH1), without colorectal cancer and without advanced adenomas
A cohort of individuals with a germline pathogenic variant in the MLH1 gene, that confers a diagnosis of Lynch syndrome, who are found to be cancer-free and adenoma-free at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (MLH1), with colorectal cancer or advanced adenomas
A cohort of individuals with a germline pathogenic variant in the MLH1 gene, that confers a diagnosis of Lynch syndrome, who are found to have colorectal cancer or an adenoma at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (MSH2), without colorectal cancer and without advanced adenomas
A cohort of individuals with a germline pathogenic variant in the MSH2 gene, that confers a diagnosis of Lynch syndrome, who are found to be cancer-free and adenoma-free at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (MSH2), with colorectal cancer or advanced adenomas
A cohort of individuals with a germline pathogenic variant in the MSH2 gene, that confers a diagnosis of Lynch syndrome, who are found to have colorectal cancer or an adenoma at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (MSH6, without colorectal cancer and without advanced adenomas
A cohort of individuals with a germline pathogenic variant in the MSH6 gene, that confers a diagnosis of Lynch syndrome, who are found to be cancer-free and adenoma-free at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (MSH6), with colorectal cancer or advanced adenomas
A cohort of individuals with a germline pathogenic variant in the MSH6 gene, that confers a diagnosis of Lynch syndrome, who are found to have colorectal cancer or an adenoma at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (PMS2), without colorectal cancer and without advanced adenomas
A cohort of individuals with a germline pathogenic variant in the PMS2 gene, that confers a diagnosis of Lynch syndrome, who are found to be cancer-free and adenoma-free at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (PMS2), with colorectal cancer or advanced adenomas
A cohort of individuals with a germline pathogenic variant in the PMS2 gene, that confers a diagnosis of Lynch syndrome, who are found to have colorectal cancer or an adenoma at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (MSH2, exon 8 deletion), without colorectal cancer and without advanced adenomas
A cohort of individuals with a germline pathogenic exon 8 deletion in the MSH2 gene, that confers a diagnosis of Lynch syndrome, who are found to be cancer-free and adenoma-free at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Lynch syndrome (MSH2, exon 8 deletion), with colorectal cancer or advanced adenomas
A cohort of individuals with a germline pathogenic exon 8 deletion in the MSH2 gene, that confers a diagnosis of Lynch syndrome, who are found to have colorectal cancer or an adenoma at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Non-Lynch syndrome, with colorectal cancer
A cohort of individuals without a germline pathogenic variant in any of the mismatch repair genes (MLH1, MSH2, MSH6, PMS2), who are found to have colorectal cancer at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Non-Lynch syndrome, with high-risk adenomas
A cohort of individuals without a germline pathogenic variant in any of the mismatch repair genes (MLH1, MSH2, MSH6, PMS2), who are found to have high-risk adenomas at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Non-Lynch syndrome, with low-risk adenomas
A cohort of individuals without a germline pathogenic variant in any of the mismatch repair genes (MLH1, MSH2, MSH6, PMS2), who are found to have low-risk adenomas at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)
Non-Lynch syndrome, without colorectal cancer and without colorectal adenomas
A cohort of individuals without a germline pathogenic variant in any of the mismatch repair genes (MLH1, MSH2, MSH6, PMS2), who are found to be cancer-free and adenoma-free at the time of colonoscopy evaluation

A combination of blood-based, mucosal-based, and hair-based analyses that evaluate the presence and the expression of:

  • a set of microRNAs (blood)
  • antibodies anti-frame shift peptides (blood)
  • mucosal-resident bacteria (healthy mucosa and cancer)
  • environmental exposure to potential carcinogens (hair matrix)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Sensitivity
Time Frame: Through study completion, an average of 1 year
True positive rate: the probability of a positive test result, conditioned on the individual truly being positive
Through study completion, an average of 1 year

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Specificity
Time Frame: Through study completion, an average of 1 year
True negative rate: the probability of a negative test result, conditioned on the individual truly being negative
Through study completion, an average of 1 year
Proportion of correct predictions (true positives and true negatives) among the total number of cases (i.e., accuracy)
Time Frame: Through study completion, an average of 1 year
A measure of trueness: proportion of correct predictions (both true positives and true negatives) among the total number of cases examined
Through study completion, an average of 1 year
Prevalence of anti-frame-shift peptide antibodies positivity in blood sample
Time Frame: Through study completion, an average of 1 year
The proportion of individuals who have detectable levels of antibodies against frame shift peptides in their blood, conditioned on the individual truly being positive
Through study completion, an average of 1 year
Tumor microbiome analysis
Time Frame: Through study completion, an average of 1 year
A comprehensive analysis of the tumor microbiome to identify high-risk patients for colorectal cancer onset
Through study completion, an average of 1 year
Immuno-environmental tumor signature
Time Frame: Through study completion, an average of 1 year

A comprehensive evaluation of the differential expression of immunosuppressive myeloid-related signatures in colorectal lesions compared to healthy mucosa of patients with Lynch syndrome.

A comprehensive evaluation of the differential expression of immunosuppressive myeloid-related signatures in the blood of individuals with Lynch syndrome, with vs. without colorectal cancer

Through study completion, an average of 1 year
Exposure analysis
Time Frame: Through study completion, an average of 1 year
A comprehensive evaluation of the environmental exposure analysis on the hair matrix of individuals with Lynch syndrome, with vs. without colorectal cancer
Through study completion, an average of 1 year

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Investigators

  • Principal Investigator: Giulia Martina Cavestro, MD, PhD, IRCCS San Raffaele Scientific Institute

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

June 1, 2023

Primary Completion (Estimated)

June 1, 2033

Study Completion (Estimated)

June 1, 2034

Study Registration Dates

First Submitted

November 25, 2024

First Submitted That Met QC Criteria

November 25, 2024

First Posted (Actual)

November 27, 2024

Study Record Updates

Last Update Posted (Actual)

April 24, 2026

Last Update Submitted That Met QC Criteria

April 21, 2026

Last Verified

April 1, 2026

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

UNDECIDED

IPD Plan Description

Data collected for the study will be made available to others, including de-identified participant data, at publication, via a signed data access agreement and at the discretion of the investigators' approval of the proposed use of such data.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Lynch Syndrome

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