Endometriosis is a common disease that affects up to 10% of women of reproductive age. Diagnosis, however, is typically delayed (up to 12 years) and is usually made after surgery. A key unmet need therefore is an accurate biomarker that can be used to detect the disease early. This study is a prospective trial to identify candidate mRNA-markers which can be used to aid in the diagnosis of this disease. It is a discovery/validation study that will identify and confirm a gene expression panel that is specific for endometriosis and provides a non-invasive tool for future use.

Endometriosis is a common disease that affects up to 10% of women of reproductive age. Diagnosis, however, is typically delayed (up to 12 years) and is typically made after surgery. A key unmet need therefore is an accurate, non-invasive biomarker that can be used to detect the disease early.

We hypothesize that endometriosis-related circulating gene expression can be identified using transcriptomic and bioinformatics approaches and used to construct an accurate diagnostic tool for this condition.

The primary objective is to develop a gene signature that detects endometriosis. The hypothesis is that this disease is characterized by a set of genes that characterize endometriosis tumor biology.

The aim is to detect over-expressed genes (elevated mRNA expression) in endometriosis tissue. The goal is to identify 10-25 biomarker genes that are highly expressed to form a candidate biomarker panel.

Highly expressed genes will be determined against samples collected from age/menstrual stage matched controls. A bio-informatics approach will be used to identify these over-expressed genes. This form the basis of a potential diagnostic panel.

Per PICOT criteria:

• The target patient population are women aged 20-35 years with a pathological diagnosis of endometriosis.
• The intervention is sample collection at the time of diagnosis (tissue, blood, saliva)
• The comparison group are normo-ovulatory subjects (age 20-25 years) undergoing surgery for benign cervical lesions.
• The outcome is a gene signature that is associated with endometriosis.
• The follow-up time is one year.

The secondary objective is to test the diagnostic utility of the 10-25 gene panel. This will be undertaken using the retrospectively collected samples.

• Each of the highly expressed genes will be measured and quantified using an RT-PCR approach.

• Genes that are statistically over-expressed in the endometriosis samples will be selected for a PCR panel.

• The expression of genes in the PCR panel will be scored.

• Low scores will be related to "control" and higher scores to "endometriosis".

• The scores will be formally evaluated as a diagnostic (area under the curve analysis, accuracy, sensitivity and specificity metrics).

• A specific comparison will be made between the endometriosis cohort and the control cohort.

• The metrics for a successful assay are:

  • Accuracy >80%
  • Sensitivity >90%
  • Specificity >85%
  • AUC >0.8

Inclusion Criteria:

For the endometriosis cohort

• a history of infertility more than 1 year
• age 20-35 years
• normal liver and kidney function, without gynaecological and other systemic disease

Inclusion criteria for controls include normo-ovulatory history, aged between 20-35 years, who exhibit normal liver and kidney function, and do not have any systemic diseases including autoimmune disease.

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Exclusion Criteria:

For the endometriosis cohort

• polycystic ovary syndrome, hyperprolactinemia
• severe cardiovascular system, liver, kidney, and hematopoietic system disease
• autoimmune disease
• uterine fibroids, endometritis, non-vegetative ovarian cysts, ovarian malignancies, and internal genital tuberculosis

Exclusion criteria for the controls includes gynaecological malignancies and genital tuberculosis.

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Female

Women with high suspicion of endometriosis and women undergoing surgery for benign cervical disease.