Completed

NCT Number: NCT02818231

Mechanisms of Cancerogenesis of Woodworkers Adenocarcinomas

Nasal adenocarcinomas are closely related to wood dust exposure. The precise mechanisms of carcinogenesis leading to the transformation of the respiratory mucosa into a colonic-like mucosa remain unknown: chronic exposure to wood dust may cause chronic inflammation that may lead to pre-degenerative lesions, hypothesis yet unconfirmed. The tumor development requires the activation of a particular gene: CDX2. The working hypothesis is that chronic wood dust exposure is responsible for changes in genes of inflammation, which can in turn lead to changes in the expression of CDX2 and its cofactors, thus making possible the genesis of adenocarcinoma. This work is a pilot study aiming to better understand the mechanisms of carcinogenesis, and to study the feasibility of a larger prospective screening for woodworkers adenocarcinomas. Cells will be obtained from the at risk area (olfactory cleft) by a noninvasive method (brushing) in healthy volunteers (unexposed to wood dust) and in exposed volunteers to compare their genomes and study the genomic changes related to wood dust exposure.

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Key information

Conditions

Ethmoid Sinus Adenocarcinoma

Age range

50 year–120 year

Sex eligibility

Male

Study type

Observational

Primary location

Service ORL-CHRU NANCY

Vandœuvre-lès-Nancy, 54511, France

About this study

Pilot study, single center, prospective and retrospective, aiming to better understand the mechanisms of carcinogenesis of nasal adenocarcinoma among 2 groups of subjects based on their potential risk of nasal adenocarcinoma.

Patients will be recruited prospectively, in the ENT department (Prof. R. JANKOWSKI-Institut Lorrain Heart and vessels Louis Mathieu -Hospitals Brabois-CHU Nancy), during a visit for another medical reason.

They will be divided into 2 groups as follows:

Group 1: NON EXPOSED : control group: patients not exposed to wood dust (low risk)
Group 2: EXPOSED: patients exposed to wood dust (high risk)

After complete information, inclusion in the study will be proposed to patients

If inclusion is accepted, patients will undergo, during the nasal fiber endoscopy (performed for care), and under local anesthesia (performed for care), a brushing of the most accessible olfactory clef (performed for research). These samples will be compared to tumor samples which are already available (REFCOR)

The samples of groups 1 and 2 will be sent directly to the laboratory of Pathological Anatomy Cytology (Pr-J.M. VIGNAUD Hospital Brabois- CHU Nancy). They will briefly vortexed (5 min) and frozen. They will be kept in the laboratory of Pathological Anatomy Cytology (Pr-J.M. VIGNAUD Hospital Brabois- CHU Nancy) until analysis. The samples will be transferred from the laboratory of Pathological Anatomy Cytology (Pr-J.M. VIGNAUD Hospital Brabois- CHU Nancy) to the Genomics Platform (INSERM, U954, Prof. JL GUEANT- Faculty of Medicine, University of Lorraine), for analysis.

RNA will be extracted from olfactory cells , using RNeasy Mini kit (Qiagen) with DNase treatment. The concentration and purity of the DNA / RNA will be measured (OD at 230nm, 260nm and 280nm) with a Nanodrop spectrophotometer (Nyxor). The RNA integrity will be determined from the profiles of ribosomal RNAs (18S & 28S) measured on LabOnChip® (2100 Bioanalyzer System, Agilent Technologies). The RNA samples will be stored at -80 ° C until use.

The transcriptome analysis will be conducted on chips Whole Human Genome 60K * 8 developed by Agilent®, and according to the manufacturer's protocol (single-color Agilent protocol).

At the end of the research samples will be destroyed.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Male, > 50 years
No known tumor
patient needing fiberendoscopy, but for nasal pathology
informed consent given
affiliation to a healthcare scheme compulsory
prior medical exam 'NON EXPOSED' group: no wood dust exposure 'EXPOSED' group : wood dust exposure > 20 years with delay since the beginning of exposure > 30 years

Exclusion criteria

Prior radiotherapy on sinus or nasal fossa
Inflammatory disease of nasal fossa
Genetic disease with cancer risk (xeroderma pigmentosum, chromosomal abnormality deletion or translocation, DNA repair deficiency)
No informed consent
No affiliation to a healthcare scheme compulsory
prior medical exam
Contra-indication to Xylocaine

Treatment and study plan

Brushing of the olfactory cleft

Other

Non invasive sampling of olfactory cleft cells, by brushing under local anesthesia during fiberendoscopy Form: survey of acceptability

Primary outcomes

The identification of expression profiles specific of wood dust exposure (comparison of both groups (exposed / non exposed))

Time frame: through study completion, an average of 1 year

Descriptive data (Mean, Median, Min, Max). Comparison of gene expression levels ( Ttest ) of both groups: identification of expression profiles specific of each group (Ftest)

Secondary outcomes

The identification of expression profiles predictive of a nasal adenocarcinoma transformation.

Time frame: through study completion, an average of 1 year

Comparison of gene expression levels of the 15 exposed patients with known gene expression levels of 15 tumor samples (intestinal adenocarcinomas related to wood dust) (T Test) Identification of common modifications of gene expression (Ftest)
The acceptability of the brushing technique

Time frame: through study completion, an average of 1 year
The acceptability will be evaluated on a composite criterion with three sub-criteria
- subjective representation of the utility of the screening (mean >5/10)
- subjective evaluation of the acceptability (pain, discomfort, complication) (mean>5/10)
- agreement for an eventual second sample (>90%) All sub-criteria must be fulfilled to meet this outcome

Sponsors and collaborators

Lead sponsor

Central Hospital, Nancy, France

Other

Registry information

Official study title

Mechanisms of Cancerogenesis for Woodworkers Adenocarcinomas: Transcriptional Study of Olfactory Cleft Cells of Patients Exposed or Not to Wood Dust

Acronym: ADK-FO

Important dates

Study start: 2016
Primary completion: 2016
Study completion: 2017
First posted: Jun 29, 2016
Registry last updated: Feb 6, 2018

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.