Fertility Preservation in SCD: Women Have More Complications

SAN DIEGO — Significant complications were common in female patients with sickle cell disease (SCD) who underwent fertility preservation (FP) procedures, and 13% required multiple retrieval cycles, a five-center retrospective study found.

Of 46 patients with SCD, complications occurred in 25 of 55 controlled ovarian hyperstimulation cycles, including 29 vaso-occlusive episodes (VOEs), researchers reported at the American Society of Hematology (ASH) 2024 Annual Meeting.

Of 21 post-retrieval VOEs, 19 required emergency department care or hospitalization.

“Baseline sickle cell disease severity is most likely associated with a patient’s risk of complications from an egg retrieval cycle,” said study co-author Sarah Cromack, MD, a reproductive endocrinology and infertility fellow at Northwestern University, Chicago, in an interview.

“Both hematologists and reproductive endocrinologists can use this information to plan ahead and anticipate possible issues, check blood counts prior to and after egg retrieval to see if transfusion is needed, and plan close follow-up during stimulation and immediately after egg retrieval to evaluate and treat pain.”

SCD Accelerates Decline in Ovarian Reserve

Pediatric hematologist Lydia H. Pecker, MD, MS, of Johns Hopkins University School of Medicine, Baltimore, the study’s corresponding author, said in an interview that SCD is “a disease of accelerated aging” that leads to accelerated decline in ovarian reserve. “The common indication for fertility preservation in SCD is before bone marrow transplant or gene therapy,” she said, although FP can also be offered to other patients with SCD.

According to Cromack, researchers launched the study to expand information about SCD and FP in light of sparse data about outcomes.

All the 46 patients had hemoglobin SS (HbSS, 93%) and HbSβ0-thalassemia (7%) and a median age of 23.7 (18-28) years. Almost all (44 patients) underwent FP prior to curative treatments, and all had at least one SCD-related complication, mainly cerebrovascular disease (16), acute chest syndrome (23), and more than two VOEs per year (31).

Median anti-Mullerian hormone (AMH) level (2.1 ng/mL), a measurement of ovarian reserve, was lower than the expected level of 2.8-3.4 ng/mL among women in the age range of the patients, the researchers reported. “This is consistent with previous studies showing lower AMH for age in women with sickle cell disease,” Pecker said.

Complications in 45% of Retrieval Cycles

“In terms of success of oocyte cryopreservation, the median number of mature eggs frozen was 11,” said co-author and reproductive endocrinologist Jessica Walter, MD, of Northwestern University, in an interview. “Given the average age of 24 years in the cohort, this would give each patient about a 70% estimated probability of at least one live birth from their cohort of frozen eggs. Thus, patients hoping for more than one child may want to consider more than one cycle of egg freezing.”

The rate of complications was “fairly high” at 45% of all cycles, Walter said. “These were mostly complications from underlying sickle cell disease, including unplanned transfusions and admissions for vaso-occlusive crises. Surprisingly, there were very few cases of ovarian hyperstimulation syndrome in this young patient group, which may be due to a combination of underlying vascular disease, lower peak estradiol levels, and slightly less eggs retrieved then would be expected compared to an age-matched healthy controls.”

Any FP complication was associated with more than three VOEs in the year before controlled ovarian hyperstimulation (mean of three VOEs per patient without complications vs six per patient with complications; P = .036).

Higher Than Normal Need for Multiple Cycles

Reproductive endocrinologist H. Irene Su, MD, professor and co-director of the Center for OB/GYN Research Innovations at Moores Cancer Center, University of California San Diego, praised the study as “an important report” in an interview.

Su, who wasn’t involved in the research, said the percentage of patients requiring more than one cycle due to cancellation or low oocyte yield — 13% — is “higher than expected, given the young age of this cohort.”

This could reflect the hypothesis that “sickle cell crises and hypoxia adversely affect the finite number of oocytes in the ovary,” she said.

As for the study findings regarding complications, she said the rate “is very high compared to the general infertility or fertility preservation population. It would be good to learn predictors of these outcomes so that fertility and hematology clinicians can work together to stratify risk and supportive services around FP cycles. It would also be good to know if the post-retrieval VOE were unexpected given the patient’s disease activity prior to FP.”

Message: FP in SCD Is Feasible, Acceptable

A.D. Mishkin, MD, MPH, an associate professor of psychiatry and liaison to the Blood and Marrow Transplantation Program at NewYork-Presbyterian/Columbia University Irving Medical Center, New York City, said in an interview that the study “establishes the feasibility and acceptability of oocyte harvest and preservation in a population of patients with active ongoing symptoms from SCD. It also indicates their interest in pursuing fertility preservation in the setting of frequent crises and the potential for management of ensuing complications.”

Mishkin, who didn’t take part in the research, highlighted the finding that half the patients got access to FP via public insurance or research funding. “Even in this population where most women had multiple complications in the year prior to FP, and even among patients who needed multiple retrievals, these patients wanted to go through that risk to preserve their fertility,” Mishkin said. “This is an important finding given the very limited access many individuals have to FP due to its high cost and limited insurance coverage, which is also largely state-dependent.”

There’s another factor to consider regarding SCD and FP: The potential danger of pregnancy.

Corresponding author Pecker noted that “pregnancy is high risk for people with sickle cell disease. There are very high rates of severe maternal mortality and morbidity even in high-income countries. However, some of this is modifiable with routine use of chronic transfusions during pregnancy and with high-quality and integrated expert SCD and expert maternal fetal medicine care during pregnancy.”

The National Institutes of Health supported the research. Pecker reported receiving research funding from Alexion, Novartis, and Aummune and consulting for Novo Nordisk. Other authors reported no disclosures. Su and Mishkin reported no disclosures.

Randy Dotinga is an independent writer and board member of the Association of Health Care Journalists.