In a retrospective cohort study of 49 women with POR, the combination of intraovarian PRP injection with accumulation of embryos through 3 consecutive mild stimulation IVF/ICSI cycles prior to transfer was carried out. Among these women, all patients except one from POSEIDON Group 3 and four from POSEIDON Group 4 had accumulated embryos or blastocysts available for transfer. Among them, 44 cases underwent accumulated embryos/blastocysts transfer, 20 (45.45%) achieved clinical pregnancy, 15(34.09%) resulted in live birth and 5 (11.36%) experienced miscarriage. To the best of our understanding, this research stands one of the few to evaluate the effectiveness of PRP intraovarian infusion in conjunction with an embryo banking strategy for women with POR. Additionally, it is among the few studies to provide follow-up data on intact live births following intraovarian PRP injection. The results suggests that PRP intraovarian infusion combined with embryo accumulation can significantly reduce the risk of not having an embryo for transfer in women with POR, and may improve cumulative live birth rates, offering a new approach for POR management.
Since the 1970s, PRP has been explored and applied, gaining widespread acceptance in routine clinical procedures as a regenerative treatment across multiple disciplines, including dermatology, plastic surgery, dentistry, orthopedics, among others.(20). Nevertheless, intraovarian PRP therapy is a relative novel alternative for women with POR. PRP intraovarian infusion has shown effectiveness in restoring ovarian function and hormonal balance. Sills et al. were pioneers in utilizing intraovarian PRP in the field of reproductive medicine.(11). In their study involving 4 patients with POR, Sills et al. observed a reduction in FSH levels and an elevation in AMH levels following intraovarian PRP intervention. However, only the decrease in FSH levels was deemed clinically significant (p < 0.01), while the rise in AMH levels was not statistically significant (p = 0.17). Melo et al. carried out a prospective non-randomized comparative pilot study involving 83 women with diminished ovarian reserve(9). Among the 83 women included in the study, 46 individuals who received PRP treatment exhibited a 63% rise in AMH levels, along with a 33% decrease in FSH levels. Importantly, the autologous PRP group showed a 75% increase in the number of antral follicles during the 3-month follow-up period. Our study revealed a significant enhancement in biochemical and ultrasound indicators of ovarian reserve following intraovarian PRP injection. Specifically, there was a 59% increase in AMH levels, a 22% decrease in FSH levels, and a 46% increase in the number of antral follicles. These findings not only corroborate previous reports but also strengthen the evidence supporting the effectiveness of intraovarian PRP injection in restoring ovarian function and hormonal profile. The research conducted by Melo et al. demonstrated a notably elevated biochemical pregnancy rate and clinical pregnancy rate(9). The live birth rate was 8.7% in the PRP group compared to 2.7% in the control group, with no statistical significance observed (p = 0.38). The systematic review conducted by Soumya et al. indicated that intra-ovarian autologous PRP infusion led to enhanced ovarian reserve parameters, leading to an increased yield of mature oocytes, fertilization rate, and the development of high-quality embryos.(21). However, none of these studies reported the effect of PRP on the cumulative live birth rate. The study of Meng et al showed in routine IVF/ICSI without intraovarian PRP injection, the cumulative clinical pregnancy rate (CCPR) and cumulative live birth rate (CLBR) for women with POR at the third complete cycle were 35.83% and 19.95% respectively(22). Furthermore, the study revealed that both conservative and optimistic estimates of the CLBR reached their highest point at the fourth complete cycle.(22). Therefore, they concluded that it is not recommended to proceed with more than four complete cycles for patients with POR, as the CLBR does not show further increase beyond this point. Our approach of three cycles of embryo accumulation following PRP injection, along with one cycle before PRP injection, is grounded on the study. Our study showed following 3 cycles of embryo accumulation post PRP injection, the CCPR and CLBR were 45.45% and 34.09% respectively. Despite the potential for variation in the CCPR and CLBR due to the relatively small sample size of our study, these outcomes offer valuable preliminary data that can inform future research, enhance patient counseling, and boost the confidence of both clinicians and POR families.
Notably, none of our patients experienced adverse side effects or any reproductive system-related side effects, which aligns with existing literature on the subject.(23, 24). Furthermore all newborns in our study were healthy. Several studies have emphasized that PRP growth factors pose no risk, as they are non-mutagenic and incapable of inducing tumor formation.(25).
PRP comprises numerous active substances(26). Nevertheless, the mechanisms of action of intraovarian PRP injection in general, and its specific effects on ovarian function, remain largely unclear. There is a notable absence of mechanistic studies aimed at elucidating the biochemical mechanisms of PRP. We hypothesize that the elevated concentrations of various growth factors including PDGF, TGF-β, IGF-1/2, VEGF and EGF found in platelet-rich concentrates(8) may play a crucial role in stimulating the growth of the limited reserve of dormant primordial follicles present in the ovaries, ultimately resulting in ovarian rejuvenation. As highlighted in the systematic review by Hajipour et al, growth factors present in PRP may influence distinct attributes of oocytes, resulting in an enhanced follicle survival rate when contrasted with the control group.(27). The authors speculated that PRP could potentially facilitate ovarian tissue regeneration and reactivation by activating dormant follicles, increasing cortical volume, and inducing neoangiogenesis in dysfunctional ovarian tissue.(12, 28).
Despite the notable strength of being the seldom study to assess the effectiveness of PRP intraovarian infusion combined with an embryo banking strategy for women with POR resulting in live births, this study is constrained by several limitations. Primarily, it is an uncontrolled longitudinal study that lacks a placebo control group. Drawing from the findings of Kawamura et al, the observed effects of PRP may not definitively exclude a primarily mechanical role.(29). Zhang et al. also conducted an evaluation of follicle growth and pregnancy outcomes involving 80 women with POI following ovarian biopsy/scratch(30). Given the absence of existing data on sham/vehicle injections for use as controls it is recommended that future studies include a control group to ensure the highest level of homogeneity for a valid comparison. The relatively small sample size represents a second limiting factor. Furthermore, the inability to predict which individuals would benefit from PRP injection into the ovaries prior to treatment is a significant constraint. Research conducted by Cakiroglu and colleagues showed that subjects without an antral follicle during PRP administration had a lower likelihood of responding to the treatment in comparison to individuals possessing one or two antral follicles(14). The researchers concluded that PRP facilitated the activation of present preantral and/or early antral follicles, suggesting that the quantity of residual follicles within the ovaries is likely to influence the magnitude of their response. Nevertheless, currently, it's not feasible to apply this observation broadly, and there's a definite need for future, rigorously designed studies to identify the specific subgroup that would most benefit from the combination of PRP intraovarian infusion and embryo banking strategy. It may necessitate invasive and ethically challenging procedures such as ovarian tissue sampling. Hence, in the future, it would be valuable and imperative to comprehensively elucidate the biological mechanisms through which PRP may influence ovarian function and to identify the specific group of women who can genuinely benefit from PRP.