To compare the abv3-integrin expression in endometrium tissue among RIF women between the GnRH analogue with Aromatase Inhibitor (Group A) , GnRH analogue with progesterone (Group B) and GnRH analogue alone as control group (Group C)

i. To determine the abv3-integrin expression isolated from endometrium tissue from women with RIF prior to medical therapy.

ii. To determine the abv3-integrin expression isolated from endometrium tissue from Group A, Group B and Group C following the medical therapy.

iii. To compare the abv3-integrin expression from endometrium tissue obtained from Group A, B and C following the medical therapy.

iv. To compare the implantation rates among Group A, B and C following the medical therapy.

v. To compare the ongoing pregnancy among Group A, B and C following the medical therapy

Inclusion Criteria:

• Women of 18 to 40 years of age
• No significant pre-existing major medical.
• Diagnosed as recurrent implantation failure - at least two or more failure of achieving pregnancy following embryo transfer (ET) despite the optimum endometrial thickness and good quality of embryo (unexplained).
• Regular menstrual cycle atleast 3 months prior to treatment
• Not taking any hormonal treatment for atlest 3months prior to recruitment
• Agreed to participate

Exclusion Criteria:

• Concurrent significant pre-existing major medical conditions such as uncontrolled diabetes, active systemic lupus erythematosus (SLE) or Anti Phospholipid Syndrome (APS) that will interfere with implantation.
• Poor quality of embryo
• Suboptimal endometrial thickness(<8mm) during the embryo transfer (ET).
• On hormonal therapy prior to recruitment.
• Not agreed to participate