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Growth Hormone Cotreatment for Low-Prognosis Patients According to the POSEIDON Criteria

Background Poor ovarian response (POR) remains one of the most challenging conditions in assisted reproduction technology. Previous studies seemed to indicate that growth hormone (GH) was a potential solution for the dilemma of POR; however, the role GH played on the low-prognosis patients diagnosed and stratified by the POSEIDON criteria remains indistinct. Methods This retrospective study was performed among women with POR according to the POSEIDON criteria who failed a previous in vitro fertilization (IVF)/intracytoplasmic sperm injection (ICSI) cycle, and the subsequent cycle was under GH cotreatment and conducted within 12 months. These participants were stratified into four groups according to the POSEIDON criteria. The comparison was implemented between the failed cycle and the cycle treated with GH. Generalized estimating equation (GEE) multivariate regression was applied for data analysis. Results A total of 428 low-prognosis women were included in this study. GH supplementation improved the live birth rates (47.66%, 28.33%, 45.45%, and 24.07%; in groups 1, 2, 3, and 4, respectively) and the clinical pregnancy rates (OR 19.16, 95% CI 7.87–46.63, p < 0.001; OR 7.44, 95% CI 1.65–33.55, p = 0.009; OR 10.19, 95% CI 2.39–43.52, p = 0.002; OR 27.63, 95% CI 4.46–171.11, p < 0.001; in groups 1, 2, 3, and 4, respectively) in all four POSEIDON groups. The number of oocytes retrieved was significantly elevated in the subgroups with normal ovarian reserve (IRR 1.47, 95% CI 1.36–1.59, p < 0.001; IRR 1.31, 95% CI 1.15–1.49, p < 0.001; in groups 1 and 2, respectively). The number of day-3 good-quality embryos was significantly elevated in the subgroups with either normal ovarian reserve or aged young (IRR 2.13, 95% CI 1.78–2.56, p < 0.001; IRR 1.54, 95% CI 1.26–1.89, p < 0.001; IRR 1.47, 95% CI 1.10–1.98, p = 0.010; in groups 1, 2, and 3, respectively). Conclusion Growth hormone cotreatment could ameliorate the pregnancy outcome for women with POR under the POSEIDON criteria who failed a previous IVF/ICSI cycle. The application of growth hormone for low-prognosis women who experienced a failed cycle might be considered and further studied.


INTRODUCTION
Although it is well acknowledged that poor ovarian response (POR) is one of the most arduous challenges in the assisted reproductive technology (ART), its definition used to be inconsistent among studies (1). In 2011, the Bologna criteria were presented by the European Society of Human Reproduction and Embryology (ESHRE) to homogenize the POR population (2). However, subsequent studies revealed that the group of POR patients defined by the Bologna criteria was clinically heterogeneous, which was primarily due to the ignorance of the effect of age on oocyte quality (3)(4)(5).
To settle this issue, the Patient-Oriented Strategies Encompassing Individualized Oocyte Number (POSEIDON) criteria for POR were proposed in 2016 (6), and they stratified all patients with POR into four groups according to maternal age, ovarian biomarkers, and the ovarian response to regular ovarian stimulation protocols. The POSEIDON criteria are viewed to be preferable than the Bologna criteria since the oocyte quality is taken into consideration and women in each subgroup shared more homogeneous characteristics, which could eventually benefit the individualized management in the clinical practice.
Growth hormone (GH) is a 191-amino-acid polypeptide hormone secreted from the pituitary gland (7) and is initially applied for conditions leading to GH deficiency. GH is reported to be capable of enhancing the functional mitochondria in oocytes (8), improving the proliferation and differentiation of granulosa cells (9,10) and increasing the endometrial blood perfusion as well (11). In seeking an effective approach to tackle the challenges of POR, GH has been explored in many related studies (8,(12)(13)(14) and utilized clinically for patients with POR during the ovarian stimulation for in vitro fertilization (IVF)/ intracytoplasmic sperm injection (ICSI) as well. Thus, it is crucial to ascertain the validity and specific effects of GH supplementation on the management of patients with POR. A recent systematic review and meta-analysis by Cozzolino et al. assessed the effectiveness of GH supplementation for POR patients and revealed that GH could increase the number of oocytes retrieved, the number of MII oocytes, the number of embryos available to transfer, and the clinical pregnancy rate (15). Yet another recent review among women with Bolognacriteria POR found that although GH could reduce the gonadotrophin (Gn) dosage required it did not improve the clinical pregnancy rate in IVF cycles, so the authors speculated that the response to GH might differ in subgroups of POR patients (16).
Many of the previous studies seemed to be indicating that GH was a promising solution for the dilemma of POR; however, they included patients with POR under Bologna criteria, or even published before the definition of the Bologna criteria. The role GH played on the low-prognosis patients diagnosed and stratified by the POSEIDON criteria is still unclear. The efficacy of GH on POR patients in specific subgroups with different ages and ovarian reserve is yet to be confirmed.
This was a retrospective study aiming to investigate the effectiveness of GH addition in the IVF/ICSI outcomes for poor responders defined by the POSEIDON criteria. These findings will offer valuable clues for the clinical application of GH for different POR subpopulation, especially for those patients uncovered by the Bologna criteria.

Participants
This retrospective study was performed among women diagnosed as POR according to the POSEIDON criteria who failed a previous IVF/ICSI cycle, and the subsequent cycle was under GH cotreatment and conducted within 12 months in the Center for Reproductive Medicine, Shandong University, from March 2018 to December 2020. The comparison was implemented between the failed cycle (non-GH cycle) and the cycle treated with GH (GH cycle).
The participants were divided into four groups according to the POSEIDON classification (6). POSEIDON group 1 consists of patients <35 years old and anti-Müllerian hormone (AMH) ≥1.2 ng/ml and an unexpected poor (<3 oocytes retrieved) or suboptimal (four to nine oocytes retrieved) response. POSEIDON group 2 consists of patients ≥35 years old with AMH ≥ 1.2 ng/ml and an unexpected poor or suboptimal ovarian response. POSEIDON group 3 consists of patients <35 years old and AMH <1.2 ng/ml; POSEIDON group 4: patients ≥ 35 years and AMH < 1.2 ng/ml. We chose AMH concentration to divide the four groups because AMH was considered to be more accurate and robust than antral follicle count (AFC) (17,18).
Exclusion criteria were as follows. (1) Different fertilization methods (IVF vs. ICSI) applied in the previous and the subsequent cycle. (2) The protocol of controlled ovarian hyperstimulation (COH) was neither gonadotropin-releasing hormone (GnRH) antagonist nor agonist protocol. (3) Either one of the couples had chromosomal abnormalities. The study was approved by the Institutional Review Board (IRB) of the Center for Reproductive Medicine, Shandong University. All the participants included in this study had signed written informed consent.
protocol, follicle-stimulating hormone (FSH) was administered on day 3 of the menstrual cycle. When at least one follicle was 12 mm or more, the GnRH antagonist (ganirelix, MSD Organon, Oss, Netherlands) at a dose of 0.25 mg daily was started and continued until the day of human chorionic gonadotropin (hCG) triggering. In the GnRH agonist ultra-long/long protocols, the patients received a long-acting GnRH agonist (leuprolide acetate, 3.75 mg) at previous cycle days 1-3 or 0.1 mg triptorelin daily injection from previous cycle day 21 for 14 days, followed by ovulation stimulation with Gn 28-35 or 14 days later. In the GnRH agonist short protocol, patients were administered 0.05/ 0.1 mg triptorelin daily injection on day 3 of the cycle, then administered Gn starting from days 4 or 5 of the cycle. In all treatment protocols, the ovaries were stimulated with FSH (Gonal-F; Merck Serono, Geneva, Switzerland; or Puregon; MSD Organon, Oss, Netherlands; or urofollitropin for injection; Livzon Pharmaceutical Group, Zhuhai, China) or human menopausal gonadotropin (menotropins for injection; Livzon Pharmaceutical Group, Zhuhai, China).
The monitoring of ovarian response and adjustment of the dose of Gn during COH were assessed by ultrasound examination and hormone concentrations. Ovulation was induced with hCG when at least one follicle was 18 mm or greater in mean diameter. Oocyte retrieval was completed 34-36 h following hCG administration by transvaginal ultrasound guidance.
GH-treated patients received 1-2 IU/day of GH (Saizen; Changchun GeneScience, Changchun, China; or GenHeal; Shanghai United Cell Biotechnology, Shanghai, China), beginning in the previous menstrual cycle (in the follicular phase or luteal phase, 1-5 weeks before Gn) and maintained until the day of triggering.

Embryo Assessment
Day-3 embryos were graded based on the number and size of blastomere and the degree of fragmentation (19). Day-5/6 embryos were graded using the Gardner scoring system (20) with respect to the inner cell mass and trophectoderm. On day 3 or day 5 of the embryo culture, up to two embryos were selected and transferred. Supernumerary blastocysts suitable for transfer were cryopreserved.

Outcome Measures
Day-3 good-quality embryos referred to the embryo reached the 7-10-cell stage and ≤20% fragmentation on day 3. Embryos available to transfer denoted the number of embryos transferred plus the number of supernumerary frozen blastocysts. Chemical pregnancy was defined as serum b-hCG level >10 IU/l 14 days after the embryo transfer. Clinical pregnancy was defined as the presence of a gestational sac by transvaginal ultrasound evaluation 5 weeks after embryo transfer. Live birth was defined as the live delivery of at least one fetus after 28 weeks of gestation.

Statistical Analysis
Data were summarized using the mean and standard deviation for quantitative variables and the number and percentage for qualitative variables. Quantitative variables were compared using paired t-test. Qualitative variables were analyzed using the chisquare test, with Fisher's exact test for expected frequencies less than five, as appropriate. Generalized estimating equations (GEE) were applied to assess the effect of GH supplementation in the numbers of oocytes retrieved, day-3 good-quality embryos and embryos available to transfer, and rates of chemical pregnancy and clinical pregnancy, after accounting for several confounders. The candidate confounders were age, body mass index (BMI), AMH, FSH, AFC, COH protocols, Gn duration, and total Gn dose. Results are presented with incidence rate ratios (IRRs) or odds ratios (ORs) and 95% confidence intervals (CIs). Statistical significance was assumed when p < 0.05. All analyses performed using STATA 15.1.

RESULTS
Our study included 428 eligible patients who were assigned to four groups based on the POSEIDON criteria: 151 women in the POSEIDON group 1, 101 women in the POSEIDON group 2, 71 women in the POSEIDON group 3, and 105 women in the POSEIDON group 4. Baseline characteristics and detailed usage of GH of all patients are summarized in .91, p < 0.001) and underwent longer duration of Gn treatments (group 2: 9.91 ± 1.98 vs. 9.43 ± 2.10, p = 0.037; group 4: 10.45 ± 3.30 vs. 9.24 ± 2.20, p = 0.001) in the GH-treated cycles than patients in non-GH cycles. COH protocols were different between the GHtreated cycles and the non-GH cycles in the four POSEIDON groups (p < 0.001).
The results of GEE regression analysis of factors related to the numbers of oocytes retrieved, day-3 good-quality embryos, and embryos available to transfer are presented in Tables 4-6

DISCUSSION
This study explored the role GH played on the IVF/ICSI outcomes for POR patients in each POSEIDON subgroup who failed an IVF/ICSI cycle followed by a subsequent GH-prescribed cycle. Our findings revealed that GH supplementation could enhance the number of embryos available to transfer and improve the clinical pregnancy rate as well as the live birth rate for all low-prognosis patients who failed a previous IVF/ICSI  cycle. GH could also significantly enhance the number of oocytes retrieved in POR subgroups with normal ovarian reserve and increase the number of day-3 good-quality embryos in subgroups either with normal ovarian reserve or aged young. Regarding live birth, women in all four POR subgroups presented with optimistic results and ended up with the live birth rate to be 47.66%, 28.33%, 45.45%, and 24.07% in POSEIDON groups 1, 2, 3, and 4, respectively. The clinical pregnancy rates were significantly increased in the subsequent GH-addition cycles among all the four POSEIDON groups as well. These findings signified the feasibility in adding GH to women with POR who experienced a failed IVF/ICSI cycle. The systematic review and meta-analysis by Cozzolino et al. (15), which included 12 randomized controlled trials (RCTs) with 1,139 patients diagnosed as poor responders according to different criteria, found that GH adjuvant therapy could help to improve the clinical pregnancy rate while not being able make a difference in the live birth rate. However, another recent metaanalysis including 15 RCTs with 1,448 patients characterized as poor responders under variable criteria demonstrated that both the clinical pregnancy rate and the live birth rate enhance significantly with GH supplementation (21). This controversy might be attributed to the discrepancy of the POR definitions and the heterogeneity in the POR population included in the previous studies. In our study, each subgroup was supposed to be homogeneous based on the POSEIDON criteria. The improved clinical pregnancy rate and live birth rate indicated that for lowprognosis women who failed a previous IVF/ICSI cycle,  regardless of their age and ovarian reserve, GH supplementation might be a potential choice to improve the pregnancy outcome. The ameliorative pregnancy outcome might be due to the elevated number of embryos available to transfer. Our results manifested that GH could raise the number of embryos available for transfer in all the four subgroups of women with POR. In several previous RCTs which applied GH as an adjuvant therapy in IVF/ICSI cycles in women with POR under Bologna criteria, the numbers of transferred embryos were significantly enhanced (22)(23)(24). In the review by Cozzolino et al. (15) including poor responders according to different definitions, the number of embryos available to transfer was also significantly increased. Our findings, along with all these previous results, confirmed that the number of transferrable embryos was probably raised after the addition of GH for women with POR, whichever subgroup they were in.
In previous studies among patients with POR diagnosed by the Bologna criteria, the number of oocytes retrieved was significantly increased after the addition of GH (22)(23)(24). In this study, by stratifying POR patients into specific subgroups according to the POSEIDON criteria, we identified that not all POR patients but only those with normal ovarian reserve (POSEIDON groups 1 and 2) exhibited a significantly elevated number of oocytes retrieved. A retrospective study enrolling POR patients with impaired ovarian reserve in POSEIDON groups 3 and 4 manifested that the numbers of oocytes retrieved were comparable in both groups (25). This result was to some perspective consistent with ours, which also indicated that the beneficial effect on the retrieved oocyte number by GH adjuvant was mainly among POR patients with normal ovarian reserve instead of those with poor ovarian reserve.
The growth hormone receptor (GHR) expressed widely on granulosa, theca, and luteal cells in the ovary (15). GH supplementation was reported to be able to increase the receptor density for the FSH receptor (FSHR), LH receptor (LHR), and GHR in the granular cells (13) and might improve follicular FSH responsiveness, which could contribute to the oocyte number retrieved for the poor responders. Moreover, GH was reported to promote the in vitro maturation of human germinal vesicle (GV) oocytes (26), which might also lead to raised oocyte number. POR patients with normal ovarian reserve were supposed to have a larger follicular pool with the potential to provide more mature oocytes to be retrieved. Our results put forward an opinion that POR patients with normal ovarian reserve, regardless of their ages, might benefit more from GH supplementation during the IVF/ICSI cycles.
In the meanwhile, we discovered that the numbers of day-3 good-quality embryos increased not only in the POR subgroups with normal ovarian reserve but also in POR patients with impaired ovarian reserve yet aged young (POSEIDON group 3). Our results might imply that young women with POR could benefit from GH in gaining good-quality oocytes. In a study including cumulusoocyte complexes (COCs) collected from women aged 26 to 46 years, the authors exhibited that among POR patients ≤ 34 years, the proportion of the good-quality oocytes (grade 2.5 and 2) was elevated with GH supplementation, while among POR patients aged above 35 years the proportion of grade 2.5 oocytes was still increased yet grade 2 oocytes decreased (8). This implicated that GH adjuvant might contribute more to the young POR patients in terms of improving the overall good-quality proportion. It uncovered that the effect of GH on quality of oocytes and embryos among young POR patients needs more attention and further studies with larger sample size.
The strength of this study was to define women with POR under POSEIDON criteria and to stratify them into groups with homogeneous clinical characteristics. Additionally, we applied a longitudinal design and compared between the two IVF/ICSI cycles performed within 12 months for the same patients, which helped to control the confounders. The limitation lay on the retrospective nature of the study and the restriction of a previous failed IVF/ICSI cycle for our participants, which narrowed the application range of patients in the conclusion.

CONCLUSION
In conclusion, growth hormone supplementation might improve the clinical pregnancy rate and the live birth rate for lowprognosis women diagnosed by POSEIDON criteria who failed a previous IVF/ICSI cycle. The application of growth hormone for low-prognosis women who failed IVF/ICSI cycles previously might be a feasible choice and needs further research.

DATA AVAILABILITY STATEMENT
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

ETHICS STATEMENT
The studies involving human participants were reviewed and approved by the Institutional Review Board (IRB) of the Center for Reproductive Medicine, Shandong University. The patients/ participants provided their written informed consent to participate in this study.