Assessment of the Mutation of Pig-A Gene as Biomarker of Genotoxic Exposure in Humans (PIG-A)

Public Assistance-Hospitals of Marseille (AP-HM)

Status: Completed

Conditions: Patient With Breast Cancer

Treatments: Genetic: blood samples

Study type: Interventional

Funder types: Other

Identifiers

NCT02727868

2015-42

2015-A01753-46 (Registry Identifier)

Details and patient eligibility

About

The evaluation of the impact of environment on the incidence of cancer is a major public health issue. Increased knowledge in this area is necessary for the implementation of primary prevention means with appropriate preventive measures but also to the implementation of secondary prevention measures with targeted screening actions.

Among the environmental exposures that may lead to cancer, mutagenic environments are of major importance, and the causal link between environmental genotoxicity and cancer has been established for a long time. It is also well established that susceptibility to mutation is highly variable among individuals. This is explained by genetic polymorphisms of genes involved in metabolism and in genome stability.

The identification of biomarkers of exposure to mutagenic environments is necessary for assessing the impact of an environment in humans. Some studies in animals have shown that the PIG-A gene may be a biomarker of exposure to a mutagenic environment. In particular, a significant increase in erythrocyte PIG-A mutants has been demonstrated in rats after a genotoxic exposure to cisplatin, but it has so far not been evaluated in humans. One study of healthy volunteers shows that the frequency of PIG-A mutated cells in humans can be estimated efficiently and reliably.

The PIG-A gene meets all the necessary criteria for a sentinel gene for tracking of spontaneous somatic mutation frequency or induced a mutagenic environment: ubiquitous expression, phenotypic change linked to a mono-allelic mutation viability of mutated cells , spectrum off inactivating mutations (deletions, substitutions, chromosomal rearrangements). Finally, the detection of the disappearance of glycosylphosphatidylinositol on the plasma membrane is easily achievable by flow cytometry.

Enrollment: 30 patients

Sex: Female

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Major patients,
• The patients achieving a breast cancer
• Patients who have benefited from a breast surgery
• Patients to have an external adjuvant radiotherapy.
• Patients being able to read and understand French.
• Patients beneficiaries of a social security scheme.
• Pregnant women can not participate in this study. A pregnancy test should only be prescribed when clinically indicated, regardless of the course of the study.
• Patients who received information and signed informed consent

Exclusion criteria

Patients who received chemotherapy before radiation therapy.

• Minor patients
• Patients who do not speak French and / or unable to read and understand French.
• Patients who have had radiotherapy history
• Patients who have had a history of chemotherapy
• Patients who have not received the information and had not signed informed consent for participation

Trial design

Primary purpose: Basic Science

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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30 participants in 2 patient groups

exclusive breast irradiation group

Other group

Description:

to assess the impact of irradiation areas

Treatment:

Genetic: blood samples

breast and sternal irradiation group

Other group

Description:

to assess the impact of irradiation areas

Treatment:

Genetic: blood samples