Profile of Daprodustat in the Treatment of Renal Anemia Due to Chronic Kidney Disease
Authors Ishii T, Tanaka T, Nangaku M
Received 25 November 2020
Accepted for publication 28 January 2021
Published 17 February 2021 Volume 2021:17 Pages 155—163
Checked for plagiarism Yes
Review by Single anonymous peer review
Peer reviewer comments 2
Editor who approved publication: Professor Garry Walsh
Taisuke Ishii, Tetsuhiro Tanaka, Masaomi Nangaku
Division of Nephrology and Endocrinology, The University of Tokyo Graduate School of Medicine, Tokyo, Japan
Correspondence: Masaomi Nangaku
Division of Nephrology and Endocrinology, The University of Tokyo Graduate School of Medicine, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 1138655, Japan
Abstract: Anemia is a major complication of chronic kidney disease (CKD), which mainly results from appropriate erythropoietin production impairment. Prolyl hydroxylase domain (PHD) inhibitors are currently being developed and approved in some countries as a new treatment for CKD patients with anemia due to the stabilization of intracellular hypoxia-inducible factor (HIF) 1α and HIF2α by PHD inhibition. Daprodustat is one of the orally administrated small-molecule HIF-PH inhibitors, leading to an increase in erythropoietin production, which is regulated by HIF. Also, daprodustat is expected to improve iron metabolism. Recently, several clinical trials showed its efficacy and safety in both hemodialysis- and non-hemodialysis- dependent CKD patients. In addition, some international Phase 3 studies are underway to confirm these effects and reveal the safety profile. This article summarizes the development process and results of each clinical trial.
Keywords: prolyl hydroxylase domain, hypoxia-inducible factor, erythropoietin, iron
The number of chronic kidney disease (CKD) patients is increasing, estimated to be about 700 million people worldwide.1 CKD causes several comorbidities and contributes to worsening quality of life and short life expectancy. One of its comorbidity is anemia, which is caused by several factors, including an insufficient amount of erythropoietin (EPO) production.2 In addition, CKD patients with anemia have a high risk for cardiovascular events and death.3 Erythropoiesis-stimulating agents (ESAs), including recombinant human erythropoietin (rhEPO), can improve renal anemia and quality of life and reduce the need for blood transfusions.4–6 However, several studies have revealed that ESA treatment increases cardiovascular events, stroke, and death when the target hemoglobin level is ≥13 g/dl.4,7–9 and that high-dose ESA is associated with a cardiovascular risk increase.10 Moreover, another major concern is hyporesponsiveness to ESA therapy, which is primarily caused by inflammation and iron deficiency.11
Hypoxia-inducible factor prolyl hydroxylase (HIF-PH) inhibitors are a new emerging treatment for renal anemia.12 HIF-PH inhibitors maintain hypoxia-inducible factor (HIF) 1α and HIF2α activity by impeding intracellular HIF degradation, leading to the activation of several HIF-regulated genes, including EPO and iron absorption- and utilization-associated genes.13 Previously, international phase 3 clinical trials, which evaluated the efficacy and safety of roxadustat, one of the HIF-PH inhibitors, were reported,14,15 and roxadustat was approved in China, Japan, and European countries. One of the orally available, small-molecule HIF-PH inhibitors, which are recently investigated, is daprodustat. Several Phase 2 studies showed that it could improve anemia in hemodialysis patients as well as non-hemodialysis-dependent CKD patients and iron utilization. Recently, phase 3 studies are ongoing, with some results being published. Based on these results, daprodustat was approved for the treatment of renal anemia in Japan.16 In this review, we summarize the efficacy and safety of daprodustat, which were reported by several phase 2 and phase 3 studies.
Daprodustat Pharmacological Summary
Daprodustat (GSK1278863) is one of the HIF-PH inhibitors that result in intracellular HIF1α and HIF2α stabilization, developed by GlaxoSmithKline. It inhibits prolyl hydroxylase domain (PHD) 1–3 with at least 1000-fold selectivity,17 is mainly metabolized by the liver, and is excreted in feces. The aforementioned metabolites are excreted in the urine.18 The half-life of daprodustat (10 mg single dose) is about 1–2 hrs in subjects with normal kidney function,19 whereas it is estimated to be 7 hrs in CKD patients (10 mg once daily).20 It is highly protein-bound (mainly albumin); therefore, it is not significantly eliminated by hemodialysis (HD).21 Indeed, in one Phase 1 study, pharmacokinetic parameters (area under the concentration–time curve, maximum observed concentration (Cmax), and time of occurrence of Cmax) were comparable between CKD stage 3–4, hemodialysis, and peritoneal dialysis patients.18 Daprodustat is mainly metabolized by CYP2CB; therefore, CYP2CB inhibitors may increase the plasma concentration of daprodustat when it is administrated with them. In contrast, CYP2CB inducers might reduce its plasma concentration. Taken together, the interview form of daprodustat recommends avoiding coadministration with CYP2CB inhibitors, including clopidogrel and trimethoprim, and CYP2CB inducers, such as rifampicin.16
Therapeutic Clinical Trials
Phase 2 Studies
Non-Dialysis CKD Patients
Holdstock et al conducted two randomized, blinded, controlled, phase 2a studies to assess hemoglobin dose-response, safety, and tolerability of a 4-week administration of daprodustat.22 In this study, two patient groups were included: one was anemic CKD stage 3–5 patients group who were not dialysis-dependent and had not used rhEPO within the past 7 weeks (NCT01587898), and the other group was a hemodialysis patients group who had anemia and used stable doses of rhEPO (NCT01587924). In the non-dialysis group, 73 patients were randomized to receive placebo or 0.5 mg, 2 mg, and 5 mg daprodustat. In this study, daprodustat showed a dose-dependent increase in hemoglobin level, with a 5 mg dose demonstrating an increase by 1.01 g/dl (SD 0.26 g/dl) at 4 weeks after initiation, compared to placebo in which the change from the hemoglobin baseline was −0.15 g/dl (SD 0.19 g/dl). In addition, plasma hepcidin and ferritin levels decreased, and total iron-binding capacity (TIBC) increased in the daprodustat group. On the other hand, plasma vascular endothelial growth factor (VEGF) levels were not significantly different across these treatment arms. In addition, the daprodustat group had decreased total cholesterol and low-density and high-density lipoprotein cholesterol levels in a dose-dependent manner (Table 1).
Table 1 Phase 2 Studies for Non-Hemodialysis-Dependent CKD Stage 3–5 Patients
A higher daprodustat dose study was conducted wherein anemic non-hemodialysis-dependent CKD stage 3–5 patients (N = 70) were randomized to placebo or 10 mg, 25 mg, 50 mg, and 100 mg daprodustat at 4 weeks of administration (NCT01047397).20 These patients never underwent or discontinued ESA treatment for seven or more days or equivalent to the interval between scheduled ESA doses.20 This study also demonstrated a dose-dependent increase of hemoglobin; however, 30% of patients discontinued this study because their hemoglobin level increased by >1 g/dl in a 2-week period or increased to >13.5 g/dl, especially in patients who received >25 mg dose of daprodustat. Plasma hepcidin and ferritin levels decreased, and TIBC increased in all daprodustat doses. Highly variable changes from the baseline of VEGF level were noted. This study suggested a suitable daily dose of <10 mg daprodustat for future long-term clinical trials.
Holdstock et al conducted a large, 24-week, open-label, randomized, phase 2b study, including anemic CKD stage 3–5 patients (NCT01977573),23 who were rhEPO-naïve (defined as non-rhEPO users within 8 weeks before screening) or rhEPO users (defined as receiving stable doses of rhEPO for 4 weeks before screening). In the rhEPO-naïve group, 180 patients were randomized 3:1, receiving 1 mg, 2 mg, or 4 mg daprodustat based on their baseline hemoglobin level or standard care of rhEPO. In the rhEPO user group, 72 patients were randomized 1:1, receiving 2 mg daprodustat or standard care of rhEPO. The daprodustat dose was unchanged for the first 4 weeks, after which the dose was adjusted to achieve or maintain the target hemoglobin level, which was different between Cohort 1 (9–10.5 g/dl) and Cohort 2 (10–11.5 g/dl). At week 24, the mean hemoglobin level was 10.2 g/dl in Cohort 1 and 10.9 g/dl in Cohort 2, whereas it was 10.7 g/dl (Cohort 1) and 11.0 g/dl (Cohort 2) in the control rhEPO administration group. Between weeks 12 and 24, 82% of patients maintained hemoglobin levels within the target range in the daprodustat group, and the rate was 66% in the control rhEPO administration group. In addition, the rate of patients who had ≥13 g/dl hemoglobin over the course of 24 weeks was 4% (daprodustat) and 5% (control) in the rhEPO-naïve group and 0% (daprodustat) and 3% (control) in the rhEPO user group. The plasma EPO level was similar to the baseline in both the darpodustat and the rhEPO group. Similar to other phase 2 studies, plasma hepcidin and ferritin levels decreased, whereas the TIBC level increased, and the VEGF level did not change from the baseline. This study indicated that these doses of daprodustat could safely achieve target hemoglobin levels among rhEPO-naïve patients and maintain target hemoglobin levels among rhEPO users.
Daprodustat was also effective in treating renal anemia among hemodialysis patients. In the abovementioned 4-week, randomized, phase 2a study,22 anemic hemodialysis-dependent patients who received a stable dose of rhEPO (N = 83) were randomized, receiving 0.5 mg, 2 mg, and 5 mg daprodustat or rhEPO treatment (NCT01587924). The mean hemoglobin level was maintained only in the 5 mg daprodustat or rhEPO administration group, whereas it decreased in the 0.5 mg and 2 mg daprodustat group. EPO concentration did not accumulate over a 4-week study period in the daprodustat group, with about 12-fold higher median peak plasma EPO level in the rhEPO group than in any daprodustat dose group. Plasma hepcidin level did not increase from baseline in both 5 mg daprodustat group and rhEPO group; however, it increased in 0.5 mg and 2 mg daprodustat groups. Similar to the results among non-hemodialysis-dependent CKD patients, no difference in the plasma VEGF level was noted between the daprodustat group and the rhEPO group (Table 2). This study showed that 0.5 mg and 2 mg daprodustat did not maintain the hemoglobin levels in hemodialysis patients when it was switched from standard rhEPO treatment.
Table 2 Phase 2 Studies for Hemodialysis Patients
A 4-week, randomized, phase 2a study included anemic hemodialysis patients who were ESA-naïve or discontinued ESA for ≥7 days (NCT01047397).20 Patients (N = 37) were randomized, receiving 10 mg and 25 mg daprodustat or placebo. Daprodustat was effective in increasing hemoglobin levels. However, 50% of patients stopped this study due to a high rate of hemoglobin increase. Based on this study, <10 mg dose of daprodustat was suggested to be suitable for the initial dose among hemodialysis patients, which is similar to non-hemodialysis-dependent CKD patients.
A 4-week, randomized, double-blind, phase 2 study was conducted to assess the efficacy and safety of daprodustat in Japanese hemodialysis patients (NCT02019719).24 Anemic hemodialysis patients who received ESA and discontinued ESA for 2–8 weeks prior to enrollment (N = 97) were randomized, receiving 4 mg, 6 mg, 8 mg, and 10 mg daprodustat or placebo if their hemoglobin level decreased by ≥0.5 g/dl and resulted in 8.5–10.5 g/dl after ESA discontinuation. Daprodustat increased the hemoglobin level in a dose-dependent manner. Also, a dose-dependent decrease of hepcidin and transferrin and increase of TIBC were observed in the daprodustat group. In addition, the cholesterol level decreased at week 4 in the daprodustat group, whereas the plasma VEGF level did not increase from baseline in both the daprodustat group and the placebo group. This study showed that daprodustat safely maintained and increased hemoglobin levels by 4–6 mg and 8–10 mg for Japanese hemodialysis patients, respectively.
Meadowcroft et al conducted a 24-week, randomized, open-label, phase 2b study in which anemic hemodialysis patients who used stable doses of rhEPO for 8 weeks before randomization were included (NCT01977482).25 These patients (N = 216) were randomized, receiving 4 mg, 6 mg, 8 mg, 10 mg, or 12 mg daprodustat or placebo, and received fixed doses of daprodustat or placebo for the first 4 weeks; after that, doses were adjusted or rhEPO was restarted to achieve or maintain the target hemoglobin range (10–11.5 mg/dl). At week 4, daprodustat increased hemoglobin levels in a dose-dependent manner, with changes evident from week 2.25 At week 24, 58% of patients reached the target hemoglobin range in either group, with a 6 mg median daprodustat dose. Daprodustat was discontinued in 10% of patients due to a high hemoglobin level (≥13 g/dl), 82% of which occurred in patients who started ≥8 mg daparodustat. Similar to other phase 2 studies, hepcidin and transferrin levels decreased, whereas TIBC increased, in the daprodustat group. No significant VEGF level differences were noted between the two groups. This study suggested that <8 mg initial dose of daprodustat was sufficient in reaching or maintaining the hemoglobin level within the target range among hemodialysis patients previously treated with rhEPO, in countries other than Japan. Also, a 29-day, randomized, double-blind, placebo-controlled, phase 2 trial showed that thrice-a-week dosing of daprodustat (10, 15, 25, 30 mg) increased the hemoglobin level in a dose-dependent manner for anemic hemodialysis patients who were receiving a stable dose of rhEPO, switching it to daprodustat (NCT02689206),26 which suggests a potential for the drug to be applied using a thrice-weekly regimen.
Phase 3 Studies
Several phase 2 studies suggested suitable daprodustat doses, efficacy for renal anemia, and safety among non-dialysis-dependent CKD and hemodialysis patients. To assess the efficacy and safety of daprodustat in a relatively larger number of patients for a long term, many phase 3 studies are underway, some of which were already completed. A 24-week, open-label, non-comparative, phase 3 study assessed the efficacy of daprodustat among Japanese hemodialysis patients with anemia who were not undergoing ESA therapy (NCT02829320)27 (Table 3). In this study, 28 patients received 4 mg daprodustat once daily, with the dose being adjusted every 4 weeks according to a prespecified algorithm to achieve target hemoglobin level (10–12 g/dl). At week 4, the mean change of hemoglobin from baseline was 0.79 g/dl (95% CI, 0.53–1.05 g/dl). At week 24, 82% of patients achieved the target hemoglobin level. During the 24-week study period, one participant had a hemoglobin level increase of >2 g/dl per 4 weeks, and three reached a high hemoglobin level (>13 g/dl), the median daprodustat dose of which was 4 mg. Similar to phase 2 studies, ferritin and hepcidin levels decreased, whereas TIBC level increased. This study showed that daprodustat was effective for renal anemia treatment among Japanese hemodialysis patients who were not receiving ESA treatment and that the initial dose of 4 mg/day was sufficient and safe to achieve the target hemoglobin level.
Table 3 Phase 3 Studies for Hemodialysis and Non-Dialysis Patients
Akizawa et al conducted a 52-week, randomized, double-blind, phase 3 study to assess the noninferiority of daprodustat in maintaining the hemoglobin level among Japanese hemodialysis patients and its safety compared to darbepoetin alfa (NCT02969655).28 Every participant received a stable dose of ESA treatment (darbepoetin alfa 10–60 µg/week, epoetin (including biosimilars) ≤9000 IU/week, or epoetin beta pegol up to 250 µg/4 weeks) at least 10 weeks before screening. Among 271 patients, 136 were randomized, receiving 4 mg daprdodustat with dose titration every 4 weeks based on a prespecified algorithm to achieve or maintain the target hemoglobin level (10–12 g/dl). During weeks 40–52, the mean hemoglobin level was 10.9 g/dl and 10.8 g/dl in the daprodustat group and darbepoetin alfa group, respectively. This study showed that daprodustat was noninferior to darbepoetin alfa because the lower limit of 95% CI for the treatment difference between the two groups exceeded the predefined noninferiority margin of −1.0 g/dl (0.1 g/dl, 95% CI −0.1 to 0.2 g/dl). In the daprodustat group, 88% of patients achieved the target hemoglobin level during weeks 40–52, and 90% achieved that in the darbepoetin alfa group. In addition, the proportion of patients with a >2 g/dl hemoglobin level increase over any 4 weeks and >13 g/dl hemoglobin level was similar between the daprodustat group and the darbepoetin alfa group (<1% vs 1%, 5% vs 6%, respectively). Both groups had a decreased hepcidin level, and the daprodustat group had a larger percent change from baseline at week 52 than the darbepoetin alfa group (−37% vs −20%). Also, both groups had a decreased ferritin level. TIBC and serum iron level increased in the daprodustat group, which did not change from baseline in the darbepoetin alfa group. In this study, supplemental iron therapy, including intravenous (IV) and oral, was allowed to be initiated from week 4 as needed. And the proportion of patients who were started with IV iron was lower in the daprodustat group than in the darbepoetin alfa group, and oral iron was similarly used in both groups. According to this study, the starting dose of 4 mg daprodustat, with a predefined dose titration algorithm, was noninferior to darbepoetin alfa because it achieved the target hemoglobin range without causing a rapid increase or overshooting of hemoglobin when switched from darbepoetin alfa, also suggesting that daprodustat might promote iron absorption and improve iron utilization compared to darbepoetin alfa.
In Japan, a 52-week, randomized, open-label, phase 3 study was conducted to assess the noninferiority of daprodustat in achieving or maintaining the target hemoglobin level (11–13 g/dl) among Japanese non-hemodialysis-dependent CKD patients (N = 299) who were ESA-naïve or ESA users, compared to epoetin beta pegol (NCT02791763).29 For ESA-naïve, non-hemodialysis-dependent CKD patients, the initial dose of daprodustat was either 2 mg or 4 mg based on their baseline hemoglobin level, with a prespecified dose titration algorithm. The initial dose of daprodustat was 4 mg, which was titrated following the algorithm in non-hemodialysis-dependent CKD patients previously treated with ESA. During weeks 40–52, the mean hemoglobin level in the daprodustat group was noninferior to the epoetin beta pegol group, as the difference in the lower limit of 95% CI between the treatment groups exceeded the predefined noninferiority margin of −1.0 g/dl (0.1 g/dl, 95% CI −0.07 to 0.28 g/dl). Also, in this study, the efficacy of daprodustat was evaluated among peritoneal dialysis patients (N = 56). The mean hemoglobin level at weeks 40–52 was 12.09 g/dl, achieving the target hemoglobin level (11–13 g/dl) in patients who received daprodustat. This study showed daprodustat was also effective in achieving and maintaining the target hemoglobin level among Japanese non-hemodialysis-dependent CKD and peritoneal dialysis patients.
As other international large phase 3 studies are ongoing or completed, these results are warranted to confirm the efficacy of daprodustat and recognize its safety profile more precisely in several groups of patients, including hemodialysis, hemodialysis-independent CKD, and incident dialysis (Table 3).
As HIF1α and HIF2α regulate the expression of various genes, HIF stabilization consequently has several effects beyond erythropoietin production, like angiogenesis, cell survival, and energy metabolism.12 For example, von Hippel Lindau disease has a germline mutation in VHL gene that results in VHL protein dysfunction and HIF stabilization, and patients with this disease are at high risk for several diseases, including clear cell renal cell carcinoma, pheochromocytoma, and retinal and cerebral hemangioblastoma.30 Also, patients with Chuvash polycythemia, which is caused by a specific mutation in VHL gene, have a higher baseline pulmonary artery pressure.31 Based on these facts, HIF activation by systemic HIF-PH inhibitor administration could promote cancer progression, pulmonary hypertension, thromboembolic complications, and retinopathy.
Contrary to these concerns, daprodustat was well-tolerated in phase 3 studies. In Japanese dialysis patients who were not undergoing ESA treatment, the death, cancer, myocardial infarction, or stroke incidence was not observed during the 24-week study period.27 Nasopharyngitis was the most common adverse event (32%), which occurred in ≥2 patients. Cholesterol decreased during this study. Shunt occlusion, which is a serious adverse event, was reported in two patients (7%). Ophthalmologic assessments were regularly conducted during this study period, with only one patient considered to develop an ocular adverse event. Among Japanese hemodialysis patients who received ESA treatment, death and cancer progression were not reported during the 52-week study period.28 Among the adverse events reported in ≥5% of patients per group, contusion and diarrhea were reported ≥5% more frequently in the daprodustat group than in the darbepoetin alfa group. Similar to a phase 2 study,25 the incidence of hyperkalemia was reported in the daprodustat group (3%) compared to the darbepoetin alfa group (1%). However, both groups showed no clinically significant change from baseline in potassium level. Each group similarly reported hypertension, and the rate of antihypertensive medication change because of increased blood pressure was 38% and 49% in the daprodustat and darbepoetin alfa groups. The incidence rate of shunt occlusion and shunt stenosis had no difference between the daprodustat and darbepoetin alfa groups (<1% vs 2%, 3% vs 4%, respectively). Regular ophthalmologic evaluation was performed in this study, and the rate of ocular adverse event incidence was similar between the two groups. In Japanese non-hemodialysis-dependent CKD patients, the rate of treatment-related adverse events was 6%, including retinal hemorrhage (<1%) in the daprodustat group.29 Among Japanese peritoneal dialysis patients, treatment-related adverse events were reported in 14% of the patients, with each occurrence rate of pulmonary embolism, pulmonary artery hypertension, and retinal hemorrhage being 2%.29
Theoretically, HIF stabilization using daprodustat was supposed to increase plasma VEGF level and result in ocular adverse events, including retinal neovascularization and retinal hemorrhage. However, plasma VEGF level increased only when a high dose of daprodustat (50–100 mg) was administered to healthy participants,19 and several phase 2 studies showed that daprodustat had no effect on circulating VEGF levels.22–25 In addition, considering that ocular adverse events did not increase in phase 3 studies,27,28 the therapeutic dose of daprodustat would not increase plasma VEGF levels.
According to prior studies, daprodustat was safely used to treat renal anemia in both hemodialysis and non-hemodialysis-dependent CKD patients. However, large, long-term studies are required for the precise evaluation of cardiovascular risk. Two large phase 3 studies are ongoing to examine the efficacy and the time to the first occurrence of major adverse cardiovascular events among hemodialysis patients (ASCEND–D trial) and non-hemodialysis-dependent CKD patients (ASCEND–ND trial) (Table 3). Although the incidence of hyperkalemia increased in two phase 3 trials of roxadustat,14,15 it had no significant increase in phase 3 studies that evaluate daprodustat efficacy for renal anemia among hemodialysis and non-hemodialysis-dependent CKD patients.28,29 To confirm whether adverse event profile differences exist among several HIF-PH inhibitors, more detailed phase 3 or phase 4 studies of each HIF-PH inhibitor should be required.
Other HIF-PH Inhibitors
Additional HIF-PH inhibitors, such as roxadustat, vadadustat, and enarodustat, were also approved in Japan for the treatment of renal anemia among hemodialysis and non-hemodialysis-dependent CKD patients. All HIF-PH inhibitors showed improvement of renal anemia. Also, Haase et al summarized the effect of HIF-PH inhibitors regarding iron metabolism and the effect on iron utilization was considered as a class effect of HIF-PH inhibitors.32 However, several effects turned out to be different among HIF-PH inhibitors. Cholesterol-lowering effect was reported in roxadustat14 and daprodustat. On the other hand, other HIF-PH inhibitors did not show the cholesterol-lowering effect. A phase 2b study that assessed the effect of vadadustat among non-dialysis-dependent CKD patients reported that the mean change from baseline in cystatin C levels was significantly small in the vadadustat group (34.9 ng/mL) compared to the placebo group (298.2 ng/mL).33 In addition, the pharmacological properties were different among HIF-PH inhibitors.34 The difference in potency to stabilize HIF suggested that the speed with which hemoglobin levels increase might be variable.35 Moreover, whether the safety profile is different among each HIF-PH inhibitor due to their structural difference or distinct metabolic profiles remains unclear.36 Therefore, more clinical studies of each HIF-PH inhibitor are needed, and these results should be compared with each other in the future.
Possible Pleiotropic Effects of HIF-PH Inhibitors Beyond Renal Anemia Therapy
Several preclinical studies showed several beneficial effects of HIF-PH inhibitors other than renal anemia improvement.12 A study using enarodustat, one of the HIF-PH inhibitors, reported that plasma adiponectin level was maintained and enarodustat might have renoprotective effects in obese type 2 diabetes mouse model37 and obese mice with a high-fat diet.38 Another study suggested that enarodustat reduced cardiac hypertrophy and myocardial fibrosis in the 5/6 nephrectomy rodent model with the nitric oxide synthase inhibitor.39 On the other hand, some preclinical studies showed that HIF-PH inhibitors had harmful effects. In the murine severe polycystic kidney disease model, the HIF-PH inhibitor enhanced cyst growth through HIF1α activation.40 Also, one in vitro study demonstrated that roxadustat promoted phosphate-induced vascular smooth muscle cell calcification.41 Therefore, post-marketing surveillance is also required in assessing the safety concerns, because of the strict limitations of clinical trials for participants based on their inclusion and exclusion criteria; meanwhile, numerous CKD patients who have several comorbidities might receive HIF-PH inhibitors in the clinical practice setting. Future studies are required to assess efficacy for renal anemia, safety, and other potential benefits of daprodustat.42
Several phase 3 and phase 2 studies showed daprodustat to be effective in improving or maintaining hemoglobin levels among hemodialysis and non-hemodialysis-dependent CKD patients, especially the Japanese ones. And this effect was noninferior to ESA treatment, with iron utilization improvement. Although there was a concern that several adverse effects might happen due to HIF stabilization through systemic PHD inhibition, adverse events of particular interest, such as cancer, hypertension, and shunt occlusion, did not increase in the daprodustat group during the study period of up to 1 year, compared to the ESA treatment group. Also, no clinically significant increase in plasma VEGF level was noted, and no ocular events were observed. Based on these results, daprodustat was approved in Japan for the treatment of renal anemia among hemodialysis and non-hemodialysis-dependent CKD patients in June 2020.16 International phase 3 clinical trials for daprodustat are underway to evaluate the efficacy and safety in depth.
Daprodustat was expected to possibly not be linked to an increase in cardiovascular disease risk because phase 2 studies showed that daprodustat could increase the hemoglobin level without excessive EPO production and plasma EPO level was lower in the daprodustat than in the rhEPO group in hemodialysis patients.22 To evaluate whether daprodustat affects cardiovascular events as a coprimary endpoint, ASCEND–D and ASCEND–ND trials are ongoing. In addition, other potentially beneficial aspects of daprodustat are being assessed. In ASCEND–NHQ trial, which is an international, randomized, double-blind, phase 3 study and includes non-hemodialysis-dependent CKD patients, health-related quality of life is evaluated as one of the secondary endpoints.
Daprodustat showed efficacy for renal anemia in both hemodialysis- and non-hemodialysis-dependent CKD patients and it was approved for the treatment of renal anemia in Japan. If the international phase 3 studies reveal positive results, daprodustat may also be another valuable treatment for renal anemia in many countries other than Japan.
M.N. has received research grant from JT, and Kyowa Kirin Co. Ltd., and personal fees from GlaxoSmithKline, Astellas, Mitsubishi Tanabe Pharma Corporation, Bayer Yakuhin Ltd., Torii Pharmaceutical Co. Ltd, and AstraZeneca, outside the submitted work. T.T. has received research grant from JT and Bayer. T.I. declared no conflicts of interest. The authors report no other conflicts of interest in this work.
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