Ovarian response to controlled ovarian hyperstimulation in cancer patients is diminished even before oncological treatment.

Objective: To evaluate the results of controlled ovarian stimulation before chemotherapy for oocyte vitrification to preserve fertility in women diagnosed with cancer and compare them with a historical control group.

Design: A retrospective, multicenter, observational study performed between March 2007 and January 2011.

Setting: University-affiliated infertility clinics.

Bleeding during transfer is the only parameter of patient anatomy and embryo quality that affects reproductive outcome: a prospective study.

There is very little information available regarding the relevance of the position of embryo replacement during ET and the different anatomic characteristics of the recipient in the transfer process and on the result of assisted reproduction techniques. We prospectively analyzed, using multivariate regression analysis, 375 ETs, 177 of which were from donated oocytes and 198 from patients' own oocytes, and we found no effect of the anatomic characteristics of the uterus on the chances of achieving pregnancy when data were analyzed according to patient age and embryo quality. Interestingly, there was a significant decrease in pregnancy rates when blood was present in the catheter after the procedure, which was confirmed in all treatments.

Female obesity impairs in vitro fertilization outcome without affecting embryo quality.

Objective: To compare embryo quality and reproductive outcome in our IVF program according to the women's body mass index (BMI).

Design: Retrospective study.

Setting: University-affiliated infertility clinic, between January 2001 and April 2007.