Rising incidence of steroid-resistant nephrotic syndrome in childhood: a 5-year retrospective observational descriptive study in a south-east Nigerian tertiary hospital

doi:10.21203/rs.3.rs-1987056/v1

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Rising incidence of steroid-resistant nephrotic syndrome in childhood: a 5-year retrospective observational descriptive study in a south-east Nigerian tertiary hospital

https://doi.org/10.21203/rs.3.rs-1987056/v1

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Introduction: Nephrotic syndrome is the commonest glomerular disease of childhood. Majority of the idiopathic cases frequently respond to steroid therapy and are regarded as steroid-sensitive nephrotic syndrome (SSNS). Several studies have reported a change in this usual pattern to steroid-resistant nephrotic syndrome (SRNS) in Nigerian children.

Aim: This study aims to determine if there is a rising incidence of SRNS in children seen at a tertiary hospital in Enugu, south-east Nigeria.

Subjects and methods: A retrospective observational descriptive study was conducted in children with nephrotic syndrome seen at the University of Nigeria Teaching Hospital, Ituku-Ozalla Enugu, over 5 years (from 2016 to 2020). The demographic variables, clinical data (including steroid-sensitive and renal-transplant cases) and histopathological pattern (including indications for renal biopsy) were documented using a study proforma.

Results: Out of a total of 150 patients, 105 (70%) were males while 45 (30%) were females. Ninety-six (64%) were aged between 1-10 years whereas fifty-four 54 (36%) were adolescents aged 11 - 18 years. Forty-eight (32%) were aged 1 - 5years. Their mean age was 8.67 ± 4.69 years. One hundred and eighteen (78.7%) had idiopathic nephrotic syndrome while 21.3% had secondary nephrotic syndrome from post-streptococcal glomerulonephritis (16/32, 50%) lupus nephritis (6/32, 18.7%), sickle-cell nephropathy (5/32, 15.6%), HIV-nephropathy (3/32, 9.4%), and hepatitis B infection (2, 6.3%). One hundred and six (71%) initially had SSNS; twelve (11.3%) and seven (6.6%) later became frequent-relapsers and steroid-dependent, respectively. Forty-four (29.3%) patients initially had SRNS. Sixty-eight patients had renal biopsy; the commonest indication being steroid-resistance. The commonest histological pattern was focal segmental glomerulosclerosis (FSGS), seen in 63.2% of these patients. Only four (9%) had renal transplant.

Conclusion: Although the prevalence of SSNS is higher in this clime, there is a rising incidence of SRNS. This trend may be attributed to incident cases of FSGS.

Childhood nephrotic syndrome

steroid sensitivity

steroid resistance

focal segmental glomerulosclerosis

Nigeria

Childhood nephrotic syndrome refers to a clinical entity characterized by massive proteinuria, hypoalbuminemia and generalized body swelling; it is the commonest glomerular disease of childhood affecting approximately 2–16 per 100,000 children per year.¹ In the southeast Nigerian city of Enugu, it accounts for about 40.5% of all renal disorders.² Globally, majority of childhood nephrotic syndrome are idiopathic; they frequently respond to steroid therapy and are thus regarded as steroid-sensitive nephrotic syndrome (SSNS).¹ However, this steroid-sensitivity varies across geographical regions depending on disease type, its possible etiology, and the underlying genetics.^1,3-6

In multi-racial countries, especially among the black population, several studies have documented a change in the predominance of steroid sensitivity: with steroid-resistant nephrotic syndrome (SRNS) assuming prominence as the commoner variant worldwide.^7-12Furthermore, a recent systematic review had confirmed high prevalence rates of histopathological subtypes associated with steroid resistance in sub-Saharan African setting.¹³

In Nigeria, although previous studies found a similar trend,^{14, 15} recent findings from other regions of the country have reported a rise in the incidence of SSNS.^16-18 In Enugu, the epidemiological pattern of childhood nephrotic syndrome was reported 2 decades ago by Okoro et al.¹⁹ However, there is no recent study in this locality indicating the current pattern or a similar rise in the incidence of SSNS as reported elsewhere in Nigeria. This study therefore aimed to determine if there is a rising incidence of SRNS in children as seen at a tertiary hospital in Enugu, south-east Nigeria.

The present study was a retrospective, observational descriptive study of children diagnosed with nephrotic syndrome. It was conducted at the Pediatric Nephrology Clinic of the University of Nigeria Teaching Hospital, Ituku-Ozalla, Enugu, over 5 years, from 2016 to 2020. The hospital is a tertiary health institution run by the central (Federal) government, and was established primarily for the patients domiciled in the south-eastern part of Nigeria and beyond. Ethical approval was obtained from the Health Research and Ethics Committee (HREC) and the Department of Records of the hospital before commencement of the study. Using a study proforma, we documented the following data only from the case files of the children with nephrotic syndrome: the demographic variables, clinical data (including steroid-responsiveness and renal-transplant cases), and histopathological patterns (including indications for renal biopsy). Data were anonymized to maintain confidentiality, and were analyzed on descriptive statistics with frequencies expressed in numbers and percentages. Means of numerical variables were estimated, and means of groups were compared with the student-t test. Relationship between two groups was evaluated with the Chi-square test. For these comparisons, the adopted p-value for statistical significance was < 0.05.

Definition of terms

Nephrotic syndrome: Diagnosis was made when degree of proteinuria in dipstick urinalysis was 3+ or 4+, or exceeding 40 mg/m²/hour or spot-urine protein-creatinine ratio of greater than 2 mg/mg, and hypoalbuminemia with a serum albumin less than 25 g/L. (For the therapeutics, all the children received oral prednisolone at 2 mg/kg/day not exceeding 60 mg for the first two months of therapy before tapering over three months).

Remission: Nil or trace proteinuria (˂ 30 mg/dl or < 4 mg/m²/h) by dipstick for three consecutive days.

SSNS: Achieving remission within four to six weeks of daily oral prednisolone. Early responders achieved remission within the first two weeks while late responders achieved remission within four to six weeks.

SRNS: Failure to achieve remission after eight weeks of appropriate oral daily dose prednisolone.

Relapse: Recurrence of 100 mg/dl (≥ 2+) proteinuria by dipstick for three consecutive days after achieving remission.

Steroid-dependent nephrotic syndrome (SDNS): Two consecutive relapses during alternate day steroid therapy or within two weeks after cessation of steroid.

Frequent relapsing nephrotic syndrome (FRNS): Two or more relapses within six months of initial response or four or more relapses in any twelve-month period.

Demographics and clinical features

Out of a total of 150 patients seen over the period, 105 (70%) were males while 45 (30%) were females, with male/female ratio of approximately 2:1. Ninety-six (64%) of the patients were aged between 1-10 years whereas fifty-four (36%) were pre-adolescents and adolescents, aged 11-18 years. Forty-eight (32%) were aged 1-5 years. The mean age was 8.67 ± 4.69 years. At presentation, all (100%) the affected children presented with recurrent generalized body swelling. Haematuria and oliguria were seen in fifty-two children (34.6%) while hypertension and leukocyturia were seen in twenty-three (15.3%) and forty-five (30%) children, respectively (Table 1). The mean values of some biochemical variables at presentation were calculated as follows: serum albumin was 18.25 + 4. 04 g/l, urine protein/creatinine ratio (spot-urine protein) was 6.34 + 4.60 mg/mg, serum cholesterol was 8.76 + 1.83 mmol/l while estimated glomerular filtration rate (eGFR) was 112.93 + 59.39 ml/min/1.73 m²

Types of nephrotic syndrome

One hundred and eighteen (78.7%) of the patients had idiopathic nephrotic syndrome while the remaining thirty-two (21.3%) had secondary nephrotic syndrome etiologically attributed to the following: post-streptococcal glomerulonephritis (16/32, 50%), lupus nephritis (6/32, 18.7%), sickle-cell nephropathy (5/32, 15.6%), HIV-nephropathy (3/32, 9.4%) and hepatitis B infection (2/32, 6.3%) (Table1).

Responses to steroid therapy

One hundred and six (70.7%) of the patients initially had SSNS of whom twelve (11.3%) and eight (7.5%) later became frequent-relapsers and steroid-dependent patients, respectively. Notably forty-four (29.3%) patients were steroid-resistant. The mean age of patients with SSNS was 7.08 ± 4.3 years while that of patients with SRNS was 12.52 ± 3.05 years. The highest percentage (95.8%) of steroid sensitivity was found in patients aged 1 to 5 years. Only four (2.7%) had remained in full remission for at least 3 years.

Steroid sensitivity versus patient’s age

The relationship between steroid sensitivity and patient’s age was evaluated. As shown in Table 2, steroid sensitivity among the patients was significantly related to younger age-group whereas steroid resistance was significantly related to older age-group (χ²=45.414, p< 0.001). This finding suggests that steroid sensitivity may be age-dependent

Similarly, in comparing the mean ages of patients with SSNS with those with SRNS, their mean ages were 7.08 ± 4.31 years and 12.52 ± 3.05 years, respectively (t=7.619, p< 0.001): indicating that the mean age of children with SRNS was significantly higher than those with SSNS.

Outcomes of SRNS cases

Eleven (7.3%) of those with SRNS received calcineurin inhibitors, twelve (8%) progressed to end-stage renal disease (ESRD) out of which four (2.7%) had a successful renal transplant with a living unrelated donor in a private facility within the country. Five (3.3%) died due to inability to afford renal replacement therapy (RRT). The rest were lost to follow-up.

Sixty-eight patients had renal biopsy; while forty-two (61.76%) of them was due to SRNS, seven (10.29%), eight (11.76%) and eleven (16.17%) were due to frequent relapses, steroid dependence, and age of onset of greater than ten years, respectively. One of those with steroid dependence relapsed after 2 years in remission. Three children declined due to sociocultural reasons and financial constraints, as the caregivers paid for the procedure out-of-pocket.

Indications for renal biopsy and histopathological patterns

The most common indication for sixty-eight patients that had renal biopsy was SRNS. Three had a repeat due to previous inconclusive results. Over the period of five years, the commonest histopathological pattern was focal segmental glomerulosclerosis (FSGS) (43/68, 63.2%). Other patterns, in the order of frequency, were diffuse mesangial (15/68, 22.0%), membranoproliferative glomerulonephritis (MPGN) (7/68, 10.0%), minimal change nephrotic syndrome (MCNS) (2/68, 3.1%), and membranous glomerulonephritis (MGN) (1/68, 1.5%) (Figure1).

Study drop-outs

Twenty-one children were excluded from the study. While seven children were excluded due to missing or incomplete data, fourteen were lost to follow-up. Thus, steroid response could not be documented.

Despite the previously reported global predominance of SSNS in childhood, emerging evidence from several studies suggest a change in the trend towards SRNS. These reports emanate particularly from countries with predominant black population. The present study was thus conducted in a sub-Saharan African setting with overwhelming majority of black children to ascertain if there is a rising incidence of SRNS in recent years.

The present study has demonstrated that the number of children with SSNS is still relatively high although a substantial proportion of them are now being diagnosed with SRNS. This finding contradicts that of the previous study in this centre by Okoro et al.,¹⁹ who reported a higher percentage of SRNS in children. This disparity can be attributed to the predominant histopathologic types (FSGS and MPGN) which the authors reported among their patients. Also, the increasing sensitivity to steroid therapy (from 30% initially reported in the previous study by Okoro et al.,¹⁹ to as high as 71% in this current study after two decades) is consistent with the findings of studies from other regions in the country,^16-18 (Table 3). These studies^16-18 were notably recent, published less than three years ago. However, two studies published more than a decade ago indicate a predominant picture of steroid sensitivity,²⁰ and that of steroid resistance.²¹The longer duration of 8 weeks on oral prednisolone (previously 4 weeks)- which allowed late responders to achieve remission- may account for this high prevalence in steroid-sensitivity patterns seen in different regions of the country.^{16-18, 20} Again, our 70.6% in SSNS is only comparable to 63.3% and 73.9% reported in Ibadan (southwest Nigeria)¹⁶ and Abuja (north-central Nigeria),¹⁷respectively. It is less than the 80.0% documented in Lagos (southwest Nigeria) by Esezobor et al.,¹⁸ and Ladapo et al.²² We speculate that the differences may due to recruitment of much younger population and possible genetic predisposition given that Lagos is a multi-ethnic cosmopolitan city. On the other hand, our finding of a higher percentage of SRNS when compared with recent studies in Lagos¹⁸ and Abuja¹⁷ is attributed to possible genetic and ethnic factors, as our study population predominantly consisted of the Igbo ethnic group. A similar steroid-responsive pattern was reported in the same ethnic group within the south-west Nigerian city of Lagos despite the geographic dissimilarity.¹⁸ Nevertheless, there appears to be a changing trend in the prevalent histopathologic types globally which may account for the rising incidence in steroid-resistance over the years. For instance, our study and those from other regions of the country^{16-18, 20, 21} show that FSGS and MPGN (associated with steroid-resistance) were the predominant histopathologic types. Contrary to the study by Olowu et al²¹ in Ile-Ife (southwest Nigeria) where MPGN predominated, the preponderance of FSGS among those with SRNS in our study is similar to reports from several other parts of the country including the northwestern city of Kano,²³ southern city of Port-Harcourt,²⁰ southwestern city of Lagos,^{18, 21} north-central city of Abuja¹⁷ and southwestern city of Ibadan.¹⁵ These findings demonstrate that genetic, ethnic and geographic factors may influence the epidemiology of childhood NS. Some authors believe that there has been a transition from quartan malarial nephropathy (QMN) through MPGN to FSGS within Nigeria in recent times.²⁴To explain the high prevalence of steroid-sensitivity in our study and elsewhere in the country, we align with the suggestion that MCNS and FSGS may occupy the extreme ends of the same disease-spectrum given the similarity in their electron microscopic findings but dissimilarity in their light microscopic findings.²⁵Additionally, the increasingly reported cases of FSGS may be explained by recently-identified APOL 1-associated FSGS (linked to the APOL-1 gene common in the black race),²⁶and the viral-mediated FSGS due to the human immunodeficiency virus (HIV) pandemic.²⁷

Furthermore, the present study also found that there was a significant decline in steroid sensitivity and a corresponding rise in steroid resistance with increasing age. However, a slight change in the steroid sensitivity pattern was noted in much older children aged 16-20 years, a finding we attribute to possible hormonal influence and transition to adulthood. Expectedly, there was a male preponderance in our study as previously documented in other studies except for the study by Anochie et al.,²⁰who reported equal numbers of both gender in their study. Again, the mean age of our patients is slightly higher than the previous finding noted by Okoro et al.,¹⁹ in our clime most likely because of the recruitment of older children in the current study.

Our study has some limitations. Firstly, it was a retrospective study which has its drawbacks, particularly the challenge of incomplete data. Secondly, some of the patients diagnosed with nephrotic syndrome during the five-year period were lost to follow-up. These study drop-outs strongly raise the likelihood of attrition bias

We therefore suggest a prospective longitudinal study to obtain a more reliable documentation of incident cases of either SSNS or SRNS. Besides, a multi-centre study in the south-eastern region of the country (which will involve a larger population of subjects) may help to provide the correct picture of the changing trend in steroid-responsiveness among children with idiopathic nephrotic syndrome in this clime.

This study has shown that there has been an increase in the cases of SSNS in the south-east Nigerian city of Enugu over a decade now. Notwithstanding this trend, there is also a rising incidence of SRNS when compared to other regions in the country. The prevalent histopathologic type, namely FSGS, may explain this finding. More importantly, the therapeutic implication is that there would most likely be a paradigm shift from the less expensive corticosteroids to the more expensive and less affordable calcineurin inhibitors in a low-income setting like Nigeria.

Ethics approval and consent to participate

The approval of the Health Research and Ethics Committee (HREC) of the University of Nigeria Teaching Hospital, Ituku-Ozalla, Enugu was sought and obtained. Also, an approval was obtained from the Hospital Records Department. All methods were carried out in accordance with relevant guidelines and regulations. All experimental protocols were approved by the HREC of the University of Nigeria Teaching Hospital who also waived the need for informed consent as data was collected from the case files.

Consent for publication

Not applicable

Availability of data and materials

The datasets generated and/or analyzed during the current study are not publicly available due to risk of data breach and the hospital policy that does not support data resharing but are available from the corresponding author on reasonable request.

Competing Interests

The authors declare that they have no competing interests.

Funding

No institution or organization contributed financially to this study. All expenses accrued were sponsored solely by the authors.

Authors’ contributions

Ngozi R Mbanefo and Samuel N Uwaezuoke conceived and designed this study including data acquisition, analysis and interpretation. Vivian U Muoneke, Odutola I Odetunde and Henrietta U Okafor substantially contributed to the revision of the manuscript. All listed authors approved the manuscript before submission.

Acknowledgements

We appreciate the tremendous effort by the record clerks who assisted with the retrieval of the case files of all the children with nephrotic syndrome during the period of study.

Authors’ information

Ngozi R Mbanefo, email: [email protected]

Samuel N Uwaezuoke, email: [email protected]

Israel O Odetunde, email: [email protected]

Vivian U Muoneke, email: [email protected]

Henrietta U Okafor, email: [email protected]

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Table 1: Demographics and clinical features of the patients with childhood nephrotic syndrome

Parameters

Frequency (n)

Percentage (%)

Gender *

-Male

-Female

105

70.0

30.0

Age (years) **

1-5

6-10

11-15

16-20

32.0

27.3

8.7

Clinical features of NS

-Generalized body swelling

-Hematuria

-Oliguria

-Hypertension

-Leukocyturia

150

100.0

34.6

15.3

30.0

Types of NS

-Idiopathic

-Secondary

118

78.7

21.3

Etiology of secondary NS

-Post-streptococcal GN

-Lupus nephritis

-Sickle-cell nephropathy

-HIV-nephropathy

-Hepatitis B infection

16^‡

6^‡

5^‡

3^‡

2^‡

50.0

18.7

15.6

9.4

6.3

*Male/Female ratio=2:1 **Mean age= 8.67 ± 4.69 years NS, nephrotic syndrome GN, glomerulo-nephritis HIV, human immunodeficiency virus ^‡n=32

Table 2: The relationship between steroid sensitivity and patient’s age group

Age group (years)	Steroid-sensitive nephrotic syndrome n=106 (%)	Steroid-resistant nephrotic syndrome n=44 (%)	χ²	P value*
1-5	46 (43.4)	2 (4.5)	45.414	<0.001
6-10	39 (36.8)	9 (20.5)
11-15	14 (13.2)	27 (61.4)
16-20	7 (6.6)	6 (13.6)

*P<0.05 taken as statistically significant

Table 3: Comparative analysis of studies conducted in different regions of Nigeria on childhood nephrotic syndrome

Parameters

Okoro et al.,19

Enugu, southeast Nigeria (2000)

Mbanefo et al. †

Enugu, southeast Nigeria (2022)

Asinobi et al.,16 Ibadan, southwest Nigeria (2019)

Olowu et al.,21 Ile-Ife, southwest Nigeria (2010)

Esezobor et al., 18 Lagos, southwest Nigeria (2020)

Anochie et al., 20 Port-Harcourt, southern Nigeria (2006)

Anigilaje et al.,17Abuja North central Nigeria (2019)

Gender

Age (years)

Mean age (years)

M > F

2-16

7.9 ± 3.4

M > F

1-18

8.67 ± 4.69

M > F

1-15

7.9 ± 3.7

M > F

2.5-14

8.3 ± 3.5

M > F

1-17

6.6 ± 4.2

M = F

1-16

5.8 ± 3.8

M > F

1.5-18

8.2 ± 4.4

Idiopathic NS

Secondary NS

SSNS

SRNS

N/A

30.0%

70.0%

78.7%

21.3%

70.6%

29.3%

N/A

63.3%

36.7%

69.2%

30.8%

45.2%

54.8%

94.0%

5.85%

85.9%

5.85%

71.4%

14.3%

80.0%

20.0%

89.1%

10.0%

73.9%

26.1%

Number of renal biopsies

Histopathological types

-FSGS

-MesPGN

-MPGN

-MGN

-MCNS

-Inconclusive reports

25%

N/A

50.0%

N/A

25%

N/A

63.2%

22.0%

10.3%

1.47%

2.94%

N/A

60.0%

N/A

27.0%

N/A

3.0%

N/A

39.1%

8.7%

43.5%

N/A

4.35%

N/A

50.0%

N/A

25.0%

60.0%

N/A

20.0%

^†Current study M, male F, female NS, nephrotic syndrome SSNS, steroid-sensitive nephrotic syndrome SRNS, steroid-resistant nephrotic syndrome FSGS, focal segmental glomerulosclerosis MesPGN, mesangial proliferative glomerulonephritis MPGN, membranoproliferative glomerulonephritis MCNS, minimal change nephrotic syndrome N/A, not available

No competing interests reported.

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Rising incidence of steroid-resistant nephrotic syndrome in childhood: a 5-year retrospective observational descriptive study in a south-east Nigerian tertiary hospital

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