Open Access

Long-term iron accumulation in dialysis patients treated with ferric citrate hydrate: a single-center, 80-week retrospective study in Japan

  • Maki Hiratsuka1Email author,
  • Katsushi Koyama1,
  • Kinya Sengo1,
  • Jun Yamamoto1,
  • Aiko Narita1,
  • Chiharu Ito1,
  • Satoshi Kominato1,
  • Arata Hibi1,
  • Keisuke Kamiya1,
  • Rumi Miyahara2,
  • Junichi Fujikawa3 and
  • Toshiyuki Miura1
Renal Replacement Therapy20173:37

https://doi.org/10.1186/s41100-017-0118-7

Received: 18 December 2016

Accepted: 31 May 2017

Published: 5 September 2017

Abstract

Background

Ferric citrate hydrate (FCH), an iron-based phosphate binder, affects mineral and iron metabolism in patients with chronic kidney disease (CKD). The long-term impact of FCH on iron overload is unknown. With this study, we investigated whether the type of dialysis is associated with FCH-related iron accumulation.

Methods

This single-center, retrospectively registered, cohort study was performed in Kariya-Toyota General Hospital, Japan, among outpatients undergoing maintenance hemodialysis (HD) or peritoneal dialysis (PD) between July 2014 and January 2017. It included 136 subjects receiving FCH treatment (104 HD patients and 32 PD patients). Their iron metabolism parameters and FCH-associated adverse events were assessed over 80 weeks.

Results

In both groups, the weekly darbepoetin alpha dose and erythropoiesis resistance index declined significantly by 16 weeks, although mean hemoglobin concentrations remained stable (10–11 g/dL), and transferrin saturation peaked at 24 weeks. The difference in the weekly darbepoetin alpha dose for HD and PD patients was 16.5 and 12.0 μg/week, respectively, (P < 0.01). Increases in iron stores were different between the two groups. Peak mean increase in serum ferritin levels (169.0 vs. 63.0 ng/mL, respectively; P = 0.001) in PD patients at 40 weeks was significantly earlier than that in HD patients. The adverse events observed suggest that FCH treatment was more likely to be discontinued within the first 16 weeks due to hemoglobin overshooting in HD patients and after 40 weeks due to ferritin overload in PD patients.

Conclusions

Oral iron supplementation with FCH was successful in all dialysis patients. However, the type of dialysis is a major factor associated with iron accumulation during long-term FCH treatment and more likely to occur in PD patients not experiencing regular, dialysis-associated iron loss. Therefore, the method of dialysis should be taken into consideration when evaluating iron stores of patients with CKD to determine the appropriate starting dose of FCH.

Keywords

Accumulation Ferric citrate hydrate Hemodialysis Iron Peritoneal dialysis

Background

Ferric citrate is a non-calcium, iron-based phosphate binder indicated for the control of serum phosphorus levels in chronic kidney disease (CKD) patients [13]. It is used to replete iron stores in iron deficiency anemia and reduces the requirement of intravenous iron and erythropoiesis stimulating agents (ESA) [4] and thus, ferric citrate is a dual-purpose therapeutic agent for dialysis patients. Recent studies reported that administration of ferric citrate led to decreased levels of serum fibroblast growth factor 23 (FGF23) independent of phosphate [3, 5], reduced the cost of anemia-management therapies [6], and was associated with fewer hospitalizations and associated costs [7].

The 2012 Kidney Disease: Improving Global Outcomes (KDIGO) guidelines recommend intravenous rather than oral iron therapy for end-stage renal disease (ESRD) dialysis patients who require ESA and/or iron supplementation, based on the higher efficacy of hemoglobin concentrations [8]. However, recent studies have focused on reevaluating the safety and availability of oral iron therapy that simultaneously delivers iron via intestinal absorption [9].

Ferric citrate hydrate (FCH, Riona®), approved in January 2014, contains 60 mg ferric iron per 250 mg tablet. Prescribing information warns that iron absorption from it may lead to excessive elevations in iron stores. Potential adverse effects, particularly iron overload due to long-term FCH use in clinical practice, are unknown. Therefore, the aim of this study was to evaluate indices of iron metabolism in hemodialysis (HD) and peritoneal dialysis (PD) patients over 80 weeks and determine whether the type of dialysis was associated with iron accumulation in ESRD patients treated with FCH.

Methods

Study design

This retrospective, cohort study was performed at a single center where outpatients have maintenance dialysis managed by the Kariya-Toyota General Hospital, Aichi Prefecture, Japan. Indicators of iron metabolism in response to FCH therapy were compared between HD and PD patients over 80 weeks.

Subjects

Medical records for all patients treated at the center from July 2014 to January 2017 identified a total of 291 patients who underwent HD or PD. Of these, 136 patients treated with FCH were included in this study (Fig. 1). Hybrid dialysis patients (PD 6 days/week plus HD 4 h/week) were categorized as combination PD patients.
Fig. 1

Patient disposition. HD hemodialysis, PD peritoneal dialysis, FCH ferric citrate hydrate

Inclusion criteria include serum phosphate >6.0 mg/dL, serum ferritin <100 ng/dL, percent transferrin saturation (TSAT) <20%, or investigator’s decision. For the remaining 155 patients not treated with FCH, the exclusion criteria was hepatic dysfunction, chronic inflammatory disease, red blood cell transfusion during the study period, malnutrition, malignancy, gastrointestinal disorder, or investigator’s decision. Of the patients with FCH treatment (n = 136), those treated for less than 16 weeks or did not achieve a mean FCH dose of 500 mg/day were also excluded, based on a previous study showing that iron stores were elevated after 16 weeks of FCH therapy [10]. Thus, a total of 87 patients treated with FCH were included in the final analysis: 62 HD patients, 25 PD patients (7 patients received combination PD). For all patients, the attending nephrologists regulated FCH dosage according to the Japanese Society for Dialysis Therapy (JSDT) guidelines: phosphorus 3.5–6.0 mg/dL, hemoglobin 10–13 g/dL, or ferritin under 300 ng/dL [11, 12]. PD patients did not combine any other oral or intravenous iron if on FCH, whereas some HD patients had intravenous iron (40 mg saccharated iron oxide) after weekly hemodialysis for 5 weeks (Fig. 2).
Fig. 2

Change in mean serum phosphate and FCH dosage in HD and PD patients. The number of HD patients (n) with concomitant use of intravenous iron (40 mg saccharated iron oxide) given at the end of hemodialysis treatment once a week. The number (n) of FCH-treated patients receiving HD and PD over 80 weeks. HD hemodialysis, PD peritoneal dialysis, FCH ferric citrate hydrate, P serum phosphate, IV iron intravenous iron

There were 49 males and 38 females, mean age was 61.9 ± 12.5 years, and mean dialysis duration was 5.81 ± 5.90 years (Table 1). The primary causes of chronic renal dysfunction were diabetes mellitus 40 (46.0%), chronic glomerulonephritis 17 (19.5%), glomerulosclerosis 13 (15.0%), and others 17 (19.5%).
Table 1

Baseline characteristics of the study population

Parameters

Total

N = 87

HD

n = 62

VS.

PD (HYB)

n = 25 (7)

Age (years)

61.9 ± 12.5

65.1 ± 11.9

 

54.0 ± 10.4

Gender [male/female (male %)]

49/38 (56.3)

37/25 (59.7)

 

12/13 (48.0)

Duration of dialysis (years)

5.81 ± 5.90

6.38 ± 6.56

 

4.42 ± 3.51

Cause of ESRD (DM %)

40 (46.0)

30 (48.4)

 

10 (40.0)

Laboratory data at start

 Hemoglobin (g/dL)

10.0 ± 0.80

10.1 ± 0.67

 

9.9 ± 1.05

 Transferrin saturation (%)

19.1 ± 8.86

17.7 ± 8.34

 

22.5 ± 9.34

 Serum ferritin (ng/dL)

52.1 ± 43.3

45.3 ± 28.1

 

69.1 ± 63.0

 Serum phosphate (mg/dL)

6.13 ± 1.15

6.21 ± 1.19

 

5.92 ± 1.07

 Corrected serum calcium (mg/dL)

9.24 ± 0.79

9.16 ± 0.77

 

9.45 ± 0.82

 Intact PTH (pg/dL)

261.1 ± 204.7

228.6 ± 146.3

 

341.9 ± 293.6

 Albumin (g/dL)

3.65 ± 0.38

3.72 ± 0.34

 

3.48 ± 0.44

 C-reactive protein (mg/dL)

0.30 ± 0.40

0.32 ± 0.38

 

0.27 ± 0.43

Concomitant drugs at start

 Average DA dosage (μg/week)

34.4 ± 24.8

35.1 ± 27.1

 

32.5 ± 18.1

aIV or oral iron preparations, N (%)

34 (39.1)

25 (40.3)

 

9 (36.0)

 Calcium carbonate, N (%)

53 (60.9)

42 (67.7)

 

11 (44.0)

 Sevelamer hydrochloride, N (%)

8 (9.2)

3 (4.8)

 

5 (20.0)

 Lanthanum carbonate, N (%)

37 (42.5)

27 (43.5)

 

10 (40.0)

 Cinacalcet, N (%)

20 (23.0)

14 (22.6)

 

6 (24.0)

Data are presented as means ± standard deviation

HD hemodialysis, PD peritoneal dialysis, HYB combination therapy with PD and HD, ESRD end-stage renal disease, DM diabetes mellitus, PTH parathormone, DA darbepoetin alpha

aIV iron, intravenous saccharated iron oxide; oral iron, ferrous citrate

Parameters

Parameters of mineral and iron metabolism were routinely measured and included in this study. Phosphorus and hemoglobin were evaluated every 2–3 weeks, whereas serum ferritin, reticulocyte count, and TSAT were evaluated every 8 weeks. Weekly ESA doses were recorded and converted to equivalent darbepoetin alpha doses (conversion ratio 1:1:200). Serum ferritin was measured by a turbidimetric latex immunoassay using the LT auto Wako ferritin kit (Wako Pure Chemical Industries, Japan). Since iron metabolism is influenced by an acute phase reactant, we investigated C-reactive protein (CRP) levels over time and avoided the data when CRP was over 1.0 mg/dL.

The primary endpoint was change in parameters of iron metabolism and weekly ESA doses from baseline to the end of treatment at 80 weeks. The safety endpoints were adverse events defined as changes in subjective symptoms or laboratory data. Thirteen baseline patient characteristics including the method of dialysis, diabetes mellitus, body mass index (BMI), serum phosphorus, mean FCH dose, hemoglobin, reticulocyte count, erythropoietin resistance index (ERI), TSAT, serum ferritin, albumin, CRP, and β2 microglobulin were also assessed as independent risk factors for their association with increased serum ferritin from baseline to 40 weeks.

Statistical analysis

Data were presented as means ± standard deviation. The repeated measures single-factor ANOVA was used to measure changes in the ESA dose, ERI, TSAT, and ferritin from baseline to 16, 24, and 40 weeks (Fig. 3b, c, e, f). Unpaired Welch’s t test was used for comparisons between HD and PD patients for changes in serum ferritin and the mean total amount of FCH per day from baseline to 40 weeks or the end of treatment at 80 weeks (Fig. 4a, b). Multiple regression analysis of changes in serum ferritin levels from baseline to 40 weeks was used to identify risk factors (Table 3).
Fig. 3

Change in mean values of iron parameters in patients undergoing HD or PD treated with FCH. Data are expressed as means ± standard deviation. The repeated measures single-factor ANOVA performed for analysis. a Hemoglobin. b Darbepoetin alpha (DA). c Erythropoiesis resistance index (ERI). d Reticulocyte count. e Transferrin saturation (TSAT). f Serum ferritin

Fig. 4

Changes in mean serum ferritin levels and mean ferric citrate hydrate (FCH) dose. a Change in mean serum ferritin from baseline to 40 weeks (Δ0–40w) or from baseline to 80 weeks. b Mean total amount of FCH administered per day from baseline to 40 weeks (0–40w) or 80 weeks (0–80w). HD hemodialysis, PD peritoneal dialysis

Results

In PD and HD groups, decline in the mean weekly ESA dose (darbepoetin alpha), which was significant at 16 weeks compared to the FCH therapy initiation, stabilized thereafter. Mean hemoglobin concentrations remained stable at 10–11 g/dL (Fig. 3a, b). The ERI declined parallel to changes in weekly ESA doses and was significantly lower at 16 weeks (Fig. 3c). The mean ESA dose in the HD group decreased by 16.5 μg/week (P = 1.94 × 10−4) and in the PD group decreased by 12.0 μg/week (P = 0.002). In both groups, the reticulocyte counts gradually increased throughout the period (Fig. 3d) and TSAT values increased to peak values by 24 weeks and stabilized thereafter (Fig. 3e). The average difference in TSAT was 8.2% (P = 5.35 × 10−6) in the HD group and 10.9% (P = 0.010) in the PD group.

Changes in serum ferritin levels were different between the groups. In HD patients, there was a gradual increase during the study period, but in PD patients, the increase was rapid, reaching peak at 40 weeks, with erratic changes observed thereafter (Fig. 3f).

Increases in serum ferritin levels from baseline to 40 or 80 weeks (Fig. 4a) were compared between the two groups. At 40 weeks, the difference was 63.0 and 169.0 ng/mL for the HD and PD groups, respectively. The increase in serum ferritin levels in PD patients was significantly higher; the difference between the two groups was 106.0 ng/mL (95% confidence interval [CI], 175.9–27.9; P = 0.009). An analysis of changes from baseline to 80 weeks revealed that the increase in mean serum ferritin levels in the HD and PD groups were not significantly different (P = 0.06). A comparison of changes in the mean total amount of oral FCH administered per day from baseline to either 40 or 80 weeks revealed no significant differences (Fig. 4b). Overall results indicated that increase in serum ferritin levels was more rapid in the PD group although some HD patients also used intravenous iron preparations (Fig. 2).

An assessment of FCH-associated adverse events from baseline to the study endpoint at 80 weeks in the HD and PD groups were at 45.2 and 37.5%, respectively (Table 2). The most frequent adverse event in the HD group was gastrointestinal symptoms reported by 16.3% patients, followed by hemoglobin overshooting observed in 10.6% patients within the first 16 weeks. In the PD group, ferritin overload was the most frequent adverse event observed in 15.6% patients after 40 weeks. These findings suggested that hemoglobin was more likely to increase soon after FCH initiation in HD patients whereas ferritin accumulation during the later stages of FCH therapy was more likely in PD patients.
Table 2

Summary of adverse events with FCH treatment

Adverse events

Total

N = 136 (%)

HD

n = 104 (%)

VS.

PD

n = 32 (%)

Any adverse event

59

(43.4)

47

(45.2)

 

12

(37.5)

 Hemoglobin overshoot, >13 g/dL

12

(8.8)

11

(10.6)

 

1

(3.1)

 Ferritin overload, >300 ng/dL

5

(3.6)

0

(0)

 

5

(15.6)

 Gastrointestinal symptoms

17

(12.5)a

17

(16.3)

 

0

(0)

 Hypophosphatemia, <3.5 mg/dL

5

(3.7)

3

(2.9)

 

2

(6.3)

 Death

10

(7.4)

7

(6.7)

 

3

(9.4)

 Other

10

(7.4)b

9

(8.7)

 

1

(3.1)

HD hemodialysis, PD peritoneal dialysis

aAny digestive trouble; nine diarrhea, four constipation, four abdominal discomfort

bOther; four nothing by mounth, four darkening of stools, one itching, one eosinophilia

Factors independently associated with changes in serum ferritin with FCH therapy were assessed by multiple regression analysis (Table 3). Thirteen variables as potential factors for iron accumulation were selected, and the outcome was changed in serum ferritin levels from baseline to 40 weeks in both groups. The dialysis method had the highest P value (1.23 × 10−6) with a regression coefficient (R 2) of 105.91 (95%CI, 66.64–145.19). BMI, baseline reticulocyte count, and ERI were also significant risk factors (P = 0.008, P = 0.002, and P = 0.050, respectively). Therefore, the method of dialysis was the strongest independent risk factor for iron accumulation at 40 weeks of FCH therapy after controlling for diabetes mellitus, BMI, serum phosphorus, mean FCH dose, hemoglobin, reticulocyte count, ERI, TSAT, ferritin, albumin, CRP, and β2 microglobulin.
Table 3

Multiple regression analysis for risk factors for increase in serum ferritin levels at 40 weeks

Variables

Regression coefficient

95% CI

P value

Method of dialysis (PD)

105.91

(66.64 to 145.19)

<0.001***

Diabetes mellitus (1)

10.56

(−23.65 to 44.77)

0.539

Body mass index (per 1%)

−5.00

(−8.63 to −1.36)

0.008**

Phosphorus (per 1 mg/dL)

2.27

(−13.08 to 17.63)

0.768

Mean FCH dose (per 1 mg/day)

−2.80

(−13.25 to 7.65)

0.594

Hemoglobin (per 1 g/dL)

14.18

(−10.81 to 39.17)

0.261

Reticulocyte count (per 1‰)

5.02

(1.93 to 8.12)

0.002**

Erythropoiesis resistance index (per 1)

2.55

(0.00 to 5.10)

0.050*

Transferrin saturation (per 1%)

−1.63

(−3.73 to 0.48)

0.127

Ferritin (per 1 ng/mL)

−0.10

(−0.62 to 0.41)

0.687

Albumin (per 1 g/dL)

42.56

(−10.06 to 95.18)

0.111

C-reactive protein (per 1 mg/dL)

−35.00

(−84.85 to 14.86)

0.165

β2-microglobulin (per 1 mg/L)

−1.42

(−4.66 to 1.81)

0.382

CI confidence interval, PD peritoneal dialysis, FCH ferric citrate hydrate

*P < 0.05, **P < 0.01, ***P < 0.001

Discussion

Patients with ESRD are frequently iron deficient. Decreased iron stores are the most common reason for resistance to treatment for anemia. As per 2015 JSDT guidelines for renal anemia in chronic kidney disease, the target hemoglobin range is 10.0–12.0 g/dL for HD patients and 11.0–13.0 g/dL in PD patients; iron supplementation is to begin if TSAT is <20% and/or serum ferritin <100 ng/mL, and discontinued if serum ferritin is >300 ng/mL. Several guidelines recommend intravenous iron therapy for superior efficacy over oral therapy. However, others caution against potential toxicities induced by intravenous iron therapy and subsequent increases in mortality, cardiovascular diseases, and infections [1316]. Therefore, the iron-based phosphate binder, FCH, was recently reassessed because it affects both mineral and iron metabolism and delivers iron by oral intake. As oral iron works via a “mucosal block” in the intestine, the ability of self-regulated iron absorption [17, 18], FCH, is more effective for maintaining hemoglobin levels or more safety for not increased inflammatory makers and oxidative stress if the serum ferritin level is less than 100 ng/dl [1921]. Despite dual benefits, FCH has a narrow therapeutic index and could simultaneously put the patient at risk for increased hemoglobin levels and iron accumulation.

The findings of the present study indicated that in PD and HD patients, FCH was successful in treating iron deficiency anemia and reducing the necessity of ESA in maintaining target hemoglobin levels. Changes in hemoglobin levels occurred early within the first 16 weeks, TSAT reached peak at 24 weeks, and reticulocyte count showed a gradual increase throughout the period. These findings, in conjunction with the adverse events, suggest that overshooting hemoglobin levels are more likely in HD patients within the first 16 weeks.

Another significant difference between the groups was the changing rate of iron accumulation, which occurred earlier in PD patients. As a phosphate binder, the FCH dose was increased in some patients with serum phosphate levels above 6.0 mg/dL, subsequently serum ferritin concentrations also increased over 300 ng/dL by 40 weeks. Some PD patients discontinued FCH or decreased the dose, and others who continued FCH could reduce dietary iron absorption due to elevated hepcidin concentrations as high hepcidin or ferritin levels block intestinal iron absorption. In contrast, iron accumulation, reflected in increased serum ferritin levels, was gradual over the 80-week study period in HD patients who routinely suffer iron loss due to the dialysis procedure itself, this does not occur in PD.

Consequently, the method of dialysis should be taken into consideration during the assessment of iron stores in CKD patients for accurate determination of the FCH starting dose. We suggest that patients should be started on relatively small doses of FCH to minimize the risk of elevated hemoglobin and ferritin levels. Long-term continuous FCH therapy is essential for achieving maximum benefit; therefore, other phosphate binders should be considered to maintain serum phosphorus levels below 6.0 ml/dL.

The adverse events observed in this cohort indicated that the hemoglobin overshoot occurred within the first 16 weeks in HD patients and ferritin overload occurred after 40 weeks in PD patients. Simultaneously, HD patients suffered gastrointestinal reactions earlier than PD patients. Prescribing information for FCH from the clinical trial in Japan reported these side effects in 17.1% HD patients and 30.4% PD patients. Our study had different results, and the reasons for this are unclear. A possible explanation is that HD patients suffer severe iron deficiency due to iron loss, and consequently, their digestive tract has a more intense, iron burden that causes gastrointestinal reactions.

Limitations of the current study are the following: The number of patients was small especially in the PD group in this single-center study, and future multi-center studies with larger cohorts are necessary. The study did not have extended observation periods, and evaluation of FCH-induced increments of serum ferritin associated with clinical outcomes such as infection, cardiovascular events, and mortality, these should be studied in the future.

Conclusions

Oral FCH therapy is successful as iron supplementation for dialysis patients. However, there was an association between the dialysis method and iron accumulation with long-term FCH therapy. Serum ferritin levels were higher in PD patients than those receiving HD. Therefore, the method of dialysis should be taken into consideration when evaluating iron stores of patients with CKD to determine the appropriate starting dose of FCH.

Abbreviations

CKD: 

Chronic kidney disease

CRP: 

C-reactive protein

ERI: 

Erythropoietin resistance index

ESA: 

Erythropoiesis stimulating agent

ESRD: 

End-stage renal disease

FCH: 

Ferric citrate hydrate

HD: 

Hemodialysis

PD: 

Peritoneal dialysis

TSAT: 

Transferrin saturation

Declarations

Acknowledgements

The authors are grateful to all the medical staff who participated in this study, especially KK, JF, and RM.

Funding

There is no funding to be disclosed.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author upon reasonable request.

Authors’ contributions

MH was involved in the study design, study procedure implementation, data analysis and article writing of the manuscript. KKo reviewed the study design and interpretation of results. JF and RM contributed to clinical data collection. KS, JY, AN, CI, SK, AH, KKa and TM participated in the study. All authors read and approved the final manuscript.

Competing interests

The authors declare that they have no competing interests.

Consent for publication

Not applicable.

Ethics approval and consent to participate

This study was conducted in accordance with the Declaration of Helsinki and approved by the institutional review board in Kariya-Toyota General Hospital, (approval number 251).

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Authors’ Affiliations

(1)
Department of Nephrology, Kariya-Toyota General Hospital
(2)
Department of Pharmacy, Kariya-Toyota General Hospital
(3)
Department of Clinical Engineering Technology, Kariya-Toyota General Hospital

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© The Author(s) 2017

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