Associations of HLA genetic variants with carbamazepine‐induced cutaneous adverse drug reactions: An updated meta‐analysis

Mohitosh Biswas; Maliheh Ershadian; John Shobana; Ai‐Hoc Nguyen; Chonlaphat Sukasem

doi:10.1111/cts.13291

. 2022 May 22;15(8):1887–1905. doi: 10.1111/cts.13291

Associations of HLA genetic variants with carbamazepine‐induced cutaneous adverse drug reactions: An updated meta‐analysis

Mohitosh Biswas ^1,^2,³, Maliheh Ershadian ^1,², John Shobana ^1,², Ai‐Hoc Nguyen ^1,², Chonlaphat Sukasem ^1,^2,^4,^5,^✉

PMCID: PMC9372413 PMID: 35599240

Abstract

Aggregated risk of carbamazepine (CBZ)‐induced cutaneous adverse drug reactions (cADRs) with different HLA variants are unclear and limited in terms of the power of studies. This study aimed to assess the aggregated risk of CBZ‐induced cADRs associated with carrying the following HLA variants: HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, HLA‐B*38:02, HLA‐B*40:01, HLA‐B*46:01, HLA‐B*58:01, HLA‐A*24:02, and HLA‐A*31:01. Literature was searched in different databases following PRISMA guidelines. The outcomes were measured as odds ratio (OR) using RevMan software by a random/fixed effects model, where p < 0.05 was set as statistical significance. In total, 46 case–control studies met the inclusion criteria and were included in this analysis consisting of 1817 cases and 6614 controls. It was found that case‐patients who carried the HLA‐B*15:02 allele were associated with a significantly increased risk of CBZ‐induced Stevens−Johnson syndrome/toxic epidermal necrolysis (SJS/TEN) compared to controls (OR 26.01; 95% CI 15.88–42.60; p < 0.00001). The aggregated risk of cADRs was slightly higher in Asian compared to Caucasian patients (Asians: OR 14.84; 95% CI 8.95–24.61; p < 0.00001; Caucasians: OR 11.65; 95% CI 1.68–80.70; p = 0.01). Further, HLA‐B*15:11, HLA‐B*15:21, or HLA‐A*31:01 allele was also associated with significantly increased risk of CBZ‐induced cADRs (HLA‐B*15:11: OR 6.08; 95% CI 2.28–16.23; p = 0.0003; HLA‐B*15:21: OR 5.37; 95% CI 2.02–14.28; p = 0.0008; HLA‐A*31:01: OR 5.92; 95% CI 4.35–8.05; p < 0.00001). Other HLA variants were not found to have any significant associations with CBZ‐induced cADRs. Strong associations between the HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, or HLA‐A*31:01 allele with CBZ‐induced cADRs have been established in this analysis. Pharmacogenetic testing of particular HLA alleles before initiation of CBZ therapy may be beneficial to patients and may help to eradicate cADRs substantially.

Study Highlights.

WHAT IS THE CURRENT KNOWLEDGE ON THE TOPIC?

Studies assessing the aggregated risk of carbamazepine (CBZ)‐induced cutaneous adverse drug reactions (cADRs) associated with carrying HLA genetic variants are conflicting and limited in terms of the power of studies. Besides HLA‐B*1502, HLA‐B*15:11, or HLA‐A*31:01, other potential genetic variants of HLA (e.g., HLA‐B*15:21) were not included in these analyses. Further, the associations of HLA‐A*24:02, HLA‐B*40:01, HLA‐B*46:01, and HLA‐B*58:01 alleles with CBZ‐induced cADRs are controversial.

WHAT QUESTION DID THIS STUDY ADDRESS?

What is the relationship of some specific HLA genetic variants (e.g., HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, HLA‐B*38:02, HLA‐B*40:01, HLA‐B*46:01, HLA‐B*58:01, HLA‐A*24:02, or HLA‐A*31:01) with cADRs?

WHAT DOES THIS STUDY ADD TO OUR KNOWLEDGE?

In this meta‐analysis, strong associations between HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, or HLA‐A*31:01 allele with CBZ‐induced cADRs have been established in which the most substantial, robust evidence has been found between HLA‐B*15:02 allele and CBZ‐induced Stevens−Johnson syndrome/toxic epidermal necrolysis (SJS/TEN). Other HLA variants (e.g., HLA‐A*24:02, HLA‐B*40:01, HLA‐B*46:01, and HLA‐B*58:01) were not associated with significantly increased risk of cADRs.

HOW MIGHT THIS CHANGE CLINICAL PHARMACOLOGY OR TRANSLATIONAL SCIENCE?

Pharmacogenetic testing of particular HLA variants before initiation of carbamazepine therapy may be beneficial to patients and may help to eradicate cADRs substantially. The findings of this analysis may facilitate the rapid translation of some selective HLA variants from bench to bedside.

INTRODUCTION

Cutaneous adverse drug reactions (cADRs) such as Stevens−Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), maculopapular exanthema (MPE), and drug reaction with eosinophilia and systemic symptoms (DRESS) are life‐threatening hypersensitivity reactions affecting predominantly the mucous membranes and skin. ¹ , ² , ³ The incidence of cADRs is generally found to be low, but the mortality rates associated with cADRs are high enough (SJS ~1–5%, TEN ~25–35%, DRESS ~10%) to be clinically concerning as reported elsewhere. ⁴ Medication use (~80% of cases) is one of the most identified and widely accepted reasons for developing life‐threatening cADRs. Although different medications such as allopurinol, phenytoin, abacavir, dapsone, flucloxacillin, and cotrimoxazole have been strongly associated with cADRs, carbamazepine (CBZ) is the most studied and causes SJS/TEN in a considerable proportion of patients. ¹ , ⁵ , ⁶ Some studies also found an association between CBZ use and the development of MPE/DRESS. ⁷ , ⁸ , ⁹ , ¹⁰

Multiple investigators have reported the relationship between human leukocyte antigen (HLA) encoded by the HLA genes and CBZ‐induced SJS/TEN. Specifically, the HLA‐B*15:02 allele has been associated with CBZ‐induced SJS/TEN predominantly in Asian ethnicities, as reported in multiple studies. ¹¹ , ¹² , ¹³ Because of the strong association found in numerous observational studies, the US Food and Drug Administration (FDA) recommended screening for the HLA‐B*15:02 allele before starting CBZ therapy, particularly in Asian patients. ¹² It is unlikely that some studies did not find very strong associations between CBZ‐induced SJS/TEN and HLA‐B*15:02 allele, which may be controversial in the clinical decision process for healthcare professionals. ¹⁴ , ¹⁵

Although few meta‐analyses have been identified, studies assessing the aggregated risk of CBZ‐induced cADRs associated with carrying HLA genetic variants are limited in terms of the power of studies and the different genetic variants of HLA. ⁵ , ¹¹ , ¹² , ¹³ , ¹⁶ , ¹⁷ Besides HLA‐B*15:02, HLA‐B*15:11, or HLA‐A*31:01, other potential genetic variants of HLA (e.g., HLA‐B*15:21) were not included in these analyses. A recent comprehensive review of HLA associated with cADRs suggested that not only the HLA‐B*15:02 allele but also HLA‐B75 serotypes (e.g., HLA‐B*15:11, HLA‐B*15:21) should be considered in assessing CBZ‐induced cADRs. ¹ Previous meta‐analysis indicated HLA‐A*24:02, HLA‐B*40:01, HLA‐B*46:01, and HLA‐B*58:01 as strong protective biomarkers ⁵ , ¹¹ although some recent studies found these alleles to increase the risk of cADRs. ¹⁸ , ¹⁹ There is also a need to update the literature as since 2018 there has been no meta‐analysis assessing such associations with a wide range of HLA genetic variants. Therefore, this study aimed to review all relevant studies systematically and to assess the aggregated risk of CBZ‐induced cADRs associated with the following HLA genetic variants: HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, HLA‐B*38:02, HLA‐B*40:01, HLA‐B*46:01, HLA‐B*58:01, HLA‐A*24:02, and HLA‐A*31:01.

METHODS

Literature search strategy

This study followed the Preferred Reporting Items for Systematic Reviews and Meta‐Analyses (PRISMA) guidelines as described elsewhere ²⁰ for identifying relevant studies from different data sources. The literature was searched in PubMed, Cochrane Library, and ScienceDirect from the inception date to October 6, 2021. Different keywords reflecting HLA genetic variants (e.g., HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, HLA‐B*38:02, HLA‐B*40:01, HLA‐B*46:01, HLA‐B*58:01, HLA‐A*24:02, HLA‐A*31:01) and CBZ with relevant terms of various forms of cADRs (i.e., SJS/TEN/MPE/DRESS) were applied to identify relevant studies. Furthermore, reference lists of all the included studies and published meta‐analyses were checked carefully to identify additional studies qualifying for this analysis.

Inclusion and exclusion criteria of the studies

Studies were included if they fulfilled the following criteria: (i) must be a case–control study in design where all patients have taken CBZ; (ii) reported the relationship between HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, HLA‐B*38:02, HLA‐B*40:01, HLA‐B*46:01, HLA‐B*58:01, HLA‐A*24:02, HLA‐A*31:01, and CBZ‐induced cADRs (SJS/TEN/MPE/DRESS); (iii) reported data were sufficient for assessing the relationship of different HLA genetic variants among cases and controls; (iv) there were no ethnic restrictions; and (v) articles must be written in English. Studies were excluded based on the following criteria: (i) if the studies were randomized control trials (RCTs) or observational cohort studies; (ii) if they were a review/systematic review/meta‐analysis/viewpoint/correspondence/perspective/letter to the editor; and (iii) if they reported insufficient data for assessing the relationship between HLA genetic variants and CBZ‐induced cADRs.

Data extraction, validity, and quality assessment

At the end of the literature search, all the entries were imported into Rayyan QCRI, a systematic review software tool for the identification of studies. ²¹ Two authors (M.E. and S.J.) were involved in the selection of studies from Rayyan QCRI in accordance with the inclusion and exclusion criteria. Any disagreement in selected studies by these two authors was resolved by the senior authors (S.C. and B.M.) via discussion with the authors engaged in the study selection process. Finally, full texts of all included studies were downloaded and checked exclusively for the extraction of relevant data. Data extraction was primarily carried out by one author (M.E.) and was double‐checked and verified by a second author (S.J.). Any discrepancies were discussed until a consensus between the two authors could be reached. If they were not in consensus, the disagreements were resolved by the lead author (B.M.). The qualities of included studies were assessed following Newcastle‐Ottawa Scale (NOS) guidelines. ²²

Assessment of aggregated risk, heterogeneity, sensitivity, and publication bias

The aggregated odds ratio (OR) was measured using the Mantel–Haenssel (M‐H) method following a fixed/random effect model based on the magnitude of heterogeneity (I ² statistics). The heterogeneity was judged depending on the value of I ² statistics, where I ² < 25%, I ² = 25–50%, and I ² > 50% indicate low, moderate, and high levels of heterogeneity, respectively. ²³ If I ² > 50, then the pooled effects were estimated using a random effect model. In contrast, a fixed effect model was applied if I ² < 50 to assess the aggregated risk. All data were analyzed using Review‐Manager software (RevMan version 5.3 Windows; The Cochrane Collaboration, Oxford, UK), where the statistical significance (p) was set as <0.05. Sensitivity analysis was performed to check the impacts of any individual study on the pooled risk and the overall effects on the heterogeneity of the studies. Publication bias was assessed by the visual inspection of the funnel plot. ²⁴

RESULTS

Selection of studies

In total, 1089 articles were identified through a literature search of different databases. After the removal of duplicates, 733 articles were considered for the screening of titles. After title screening, 381 records were removed, and the remaining 352 were considered for abstract screening. After abstract screening, 166 articles were included for full‐text assessment. During full‐text assessment, 120 articles were excluded for different reasons, and finally 46 articles met the inclusion criteria for this meta‐analysis. The complete selection process following PRISMA guidelines is illustrated in Figure 1.

PRISMA flowchart for identification of eligible studies. HLA, human leukocyte antigen.

Characteristics of included studies

The basic characteristics of all included studies are shown in Table 1. Of the 46 studies, 41 were conducted in Asian populations in which 15 studies represented the Chinese population, 5 from Thailand, 5 from India, 3 from Malaysia, 2 from Japan, 1 from Singapore, 2 from Taiwan, and the other 6 studies were from other parts of Asia. Six studies investigated Caucasians, while only one study examined multi‐ethnic populations for assessing the risk of cADRs associated with different HLA genetic variants (Table 1). A total of 44 studies reported the risk in case patients using tolerant controls, while only 4 studies used the healthy population as controls. Qualities of all included studies as assessed by following NOS ranged from ‘4’ to ‘9’ as shown in Table S1.

TABLE 1.

Baseline characteristics of included studies

Author	Country	Study design	Sample size (case)	Mean age ± SD; % of male	Assessed HLA variants	Variant allele in case (n/N)	Tolerant controls	Healthy controls	Outcomes	Genotyping method
Aggarwal (2014) ⁶²	North Indian population	Case–control	17	33.9 ± 11.6; 5%	B*15:02	2 /9	0/37		SJS/TEN	PCR‐SSP
Amstutz (2013) ⁸¹	Canada	Case–control	42	9.9; 55%	A31:01 B15:02	9/42 3/42	3/87 1/87		SCARs	SBT
Capule (2020) ⁸⁰	Filipino	Case–control	29	38.1 ± 12.9; 62.5%	A31:01 A24:02 B15:02 B15:21 B38:02 B40:01 B46:01 B58:01	1/8 3/8 2/8 4/8 1/8 1/8 1/80	2/32 15/32 2/32 4/32 9/32 2/32 2/32 3/32		SJS/TEN	SSP
Chang (2011) ⁶⁷	Multi‐ethnic Malaysia (16 Malays, 3 Chinese, 2 Indian)	Case–control	21	–	HLA‐B*1502	12/16	–	47/300	SJS/TEN	PCR‐SSP
Chong (2014) ⁷²	Singapore pediatric (Chinese, Malay, India)	Case–control	32	SJS/TEN:13.4 HSS: 8.9	B*1502	6/22	1/10		SCARs	SSP
Cheung (2013) ⁴²	Hong Kong Han China	Case–control	55	36.1 ± 16.9; 59.3%	B15:02 B38:02 B46:01 B58:01 B*40:01	24/26 2/27 3/27 2/27 1/27	16/135	275	SJS/TEN	PCR‐SSP
Chung (2004) ⁴³	Han Chinese, Taiwan	Case–control	44	43.0; 58.1	B*1502	44/44	3/101		SJS	MS
Devi (2017) ⁶³	South Indian population	Case–control	12	11–85; 50%	B*15:02	1/4	0/3		SJS/TEN	PCR SSP
Fricke‐Galindo (2014) ⁸²	Mexican Mestizo	Case–control	21	35 ± 12; 33%	A*31:01:02	2/5	0/18	23/225	MPE	SBT
Genin (2014) ⁸⁷	1. Han Chinese Taiwan 2. Caucasian Europe	Case–control	93	–	EUROPE A31:01 B15:02 Taiwan A31:01 B15:02	10/30 0/30 6/63 41/63	10/257 0/43 3/72 4/72		DRESS, SJS/TEN	SSP
Hsiao (2014) ⁴⁴	Han Chinese (Taiwan)	Case–control	194	49.2 ± 18; 52%	A* 2402 A3101 B1502 B*4001	33/186 16/186 103/186 27/186	43/152 5/152 11/152 57/152		SJS/TEN DRESS MPE	SSO, SBT
He (2013) ⁴⁵	Northeastern China	Case–control	35	31.4;57.1%	B15:02 B58:01	8/35 4/20	2/125 6/125		SJS/TEN	PCR–SBT
Hung (2006) ⁷³	Taiwan	Case–control	91	SJS/TEN:43.4; HSS: 51.5; MPE:45.9; 40.7%	A31:01 A24:02 B15:02 B40:01	9/91 14/91 60/91 16/91	4/144 41/144 6/144 59/144		SJS/TEN HSS MPE	MS
Ihtisham (2019) ⁶⁴	North Indian	Case–control	120	25.3; 48.6%	A*31:01	35/81	3/70		MPE	PCR‐SSP; PCR‐SSO
Khor (2014) ⁶⁵	Indian	Case–control	5	39.2; 80%	B*15:02	2/5	2/52		SJS/TEN	SSOP
Khor (2017) ⁶⁸	Malaysia; Malay, Chinese, Indian	Case–control	28	36.6;46.4%	B15:02 A31:01	20/28 3/28	23/227 12/227		SJS/TEN	SSOP
Kim (2011) ⁷⁵	Koreans	Case–control	24	52.1 ± 15.1; 54.2%	A24:02 A31:01 B1502 B1511	5/24 13/24 1/24 3/24	21/50 7/50 0/50 2/50		SCARs	SSOP
Khosama (2017) ⁷⁹	Indonesia	Case–control	14	33.5; 56.7%	B*1502 Javanese Sundanese Padangnese	8/14 3/4 2/4 1/1	14/53		SJS/TEN	SSO
Ko (2011) ⁷⁴	Taiwan	Case–control	18	–	B*1502	18/18	2/11		SJS/TEN, SJS	PCR‐SBT
Ksouda (2017) ⁸³	Tunisian	Case–control	14	48.80; 64.2%	A*31:01	4/7	1/25		DRESS	SSO
Kulkantrakorn (2012) ⁵⁷	Thailand	Case–control	34	47.0 ± 14.7; 28%	B*1502	32/34	7/40		SJS/TEN	RT‐PCR, SSP
Locharernkul (2008) ⁵⁸	Thailand	Case–control	31		B*1502	6/11	0/4		SJS MPE	SSP
Li (2013) ⁴⁶	Han Chinese	Case–control	249	30.8 ± 16.2; 72.5%	A24:02 A31:01 B15:02 B15:11 B38:02 B46:01 B40:01 B58:01	16/40 1/40 4/40 2/40 2/40 15/40 7/40 3/40	14/52 1/52 5/52 1/52 9/52 16/52 8/52 13/52		MPE	PCR‐SBT
Man (2007) ⁴⁷	Han Chinese, Hong Kong	Case–control	24	36; 50%	B*15:02	8/24	16/48		SCARs	SSP
Maekawa (2015) ⁷⁰	Japanese	Case–control	210	53; 47.6%	A*31:01	9/21	–	482/2873	SJS/TEN	SSP‐PCR
McCormack (2011) ⁸⁴	Northern European	Case–control	26	–	A*31:01	38/145		10/257	SCARs	SSP
Mehta (2009) ⁶⁶	Indian Hindu	Case–control	8	22.8; 50%	B*1502	6/8	0/10		SJS, SJS/TEN	SSP
Nakkam (2021) ⁵⁹	Thailand	Case–control	91	17.3; 40.7%	A24:02 B15:02 B15:11 B15:21 B46:01 B38:02 B40:01 B58:01	15/91 76/91 1/91 4/91 19/91 8/91 8/91 7/91	34/144 18/144 0/144 0/144 42/144 6/144 21/144 17/144		SCARs	SSO
Nguyen (2015) ⁷⁶	Vietnam	Case–control	38	40.6 ± 18.7; 52.6%	B* 38:02 B* 40:01 B* 46:01 B58:01 B15:02	2/38 2/38 5/38 0/38 34/38	2/25 2/25 9/25 4/25 6/25		SCARs	SSOP
Niihara (2011) ⁷¹	Japanese	Case–control	15	50.7; 33.3%	B15:02 B15:11 B40:01 B46:01 B*58:01	0/15 1/15 2/15 1/15 0/15	0/33 1/33 4/33 3/33 2/33		ADRs SJS/TEN MPE DIHS, EEM	PCR‐SSO
Ramírez (2017) ⁸⁵	Caucasian (Romani Spanish	Case–control	27	50; 38.5%	B1502 A31:01 B40:01 B58:01	1/2 2/4 1/4 1/4	0/23 1/23 0/23 0/23		SJS/TEN DRESS	SSOP
Shafeng (2021) ⁴⁸	Northwest China	Case–control	165	–; 80%	B*1502	4/5	19/48		MPE	DFMH
Shi (2012) ⁴⁹	Southern China Han China	Case–control	18	27.8 ± 14.9; 61.1%	B15:02 A24:02 A31:01 B40:01 B4601 B15:11 B*38:02	15/18 10/16 1/16 8/18 6/18 2/18 1/18	– 8/32 0/32 – – – –	39/264 86/264 15/264 76/264 63/264 1/264 37/264	SJS/TEN	PCR‐SSP, SBT
Shi (2017) ⁵⁰	Southern Han Chinese	Case–control	91	–	B15:02 C08:01 DRB112:02 A24:02 B15:11 B15:02	39/56 42/55 29/54 17/56 4/56 19/132	28/179 38/177 45/176 28/178 0/179 28/179		SJS/TEN MPE	SBT
Shi (2021) ⁵¹	China	Case–control	267	24.8 ± 17.8; 53.9%	B*38:02	18/145	10/179		MPE	SBT
Shirzadi (2015) ⁸⁶	Norway	Case–control	86	27; 34%	A31:01 A24:02	4/48 14/48	2/79 13/79		MPE, HSS	SSO
Sukasem (2018) ⁶⁰	Thailand	Case–control	38	44; 63.2%	B15:02 B15:21 B40:01 B46:01 B*58:01	17/38 2/38 5/38 8/38 8/38	11/271 4/271 41/271 64/271 22/271	71/470 2/470 58/470 122/470 57/470	SCARs	PCR‐SSOP
Sun (2014) ⁵²	China	Case–control	17	6.9 ± 3.6; 64.7%	B*1502	3/11	2/18		SJS	SSP
Tassaneeyakul (2010) ⁶¹	Thailand	Case–control	42	42.4 ± 17; 35.7%	B15:02 B15:21 B38:02 B40:01 B46:01 B58:01	37/ 42 2/42 2 /42 3/42 9/42 3/42	5/42 0/42 2/42 6/42 11/42 8/42		SJS/TEN	PCR‐SBT, PCR SSP
Tan‐Koi (2017) ⁷⁷	Chinese, Malays and Indians in Singapore	Case–control	91	–	B*15:02	13/13	3/26		SCARs	SBT
Then (2011) ⁶⁹	Malaysian, Malaysia	Case–control	27	18.07; 33.3%	B*15:02	617	0/8	–	SCARs	SSP
Wang (2014) ⁵³	Han Chinese	Case–control	27	33; 41%	B15:02 B58:01	12/16 0/16	3/39 9/39		SJS/TEN	PCR‐SBT
Wang (2011) ⁵⁴	Southern China mainland	Case–control	48	32 ± 16.8; 58.3%	B*15:02	19/48	11/80		SJS/TEN MPE	PCR‐SSP
Wu (2010) ⁵⁵	Central China	Case–control	86	31.5 ± 16.5; 69.4%	B*15:02	11/36	4/50		SJS/TEN, MPE	PCR‐SBT
Yuliwulandari (2017) ⁷⁸	Indonesia: Javanese and Sundanese	Case–control	12	34.3; 47%	B15:02 B15:21 B38:02 B40:01 B*58:01	8/12 2/12 0 0 0	4/17 1/17 0 1/17 0	54/236 33/236 25/236 17/236 27/236	SJS/TEN	SSOP
Zhang (2011) ⁵⁶	Mainland Han Chinese	Case–control	38	37.9 ± 18.3;0.43%	B*15:02	16/17	2/21	17/185	SJS/TEN	PCR‐SSP, PCR‐SBT

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Abbreviations: ADR, adverse drug reaction; DFMH, digital fluorescence molecular hybridization; DIHS, drug‐induced hypersensitivity syndrome; DRESS, drug reaction with eosinophilia and systemic symptoms; EEM, erythema exsudativum multiforme; HLA, human leukocyte antigen; HSS, hypersensitivity syndrome; MPE, maculopapular exanthema; MS, mass spectrometry; PCR‐SBT, polymerase chain reaction sequencing‐based typing; PCR‐SSO, polymerase chain reaction‐sequence specific oligonucleotide; PCR‐SSOP, polymerase chain reaction‐sequence specific oligonucleotide probe; PCR‐SSP, polymerase chain reaction‐sequence specific primers; RT‐PCR, reverse transcription‐polymerase chain reaction; SCARs, severe cutaneous adverse drug reactions; SD, standard deviation; SJS, Stevens–Johnson syndrome; TEN, toxic epidermal necrolysis.

Association of HLA‐B15:02* with CBZ‐induced cADRs

In total, 38 studies consisting of 1346 cases, 2504 tolerant controls, and 564 population controls were included for the assessment of the relationship between HLA‐B*15:02 and CBZ‐induced cADRs. After pooled estimation, it was found that case‐patients who carried the HLA‐B*15:02 allele were associated with a significantly increased risk of cADRs compared to controls (OR 14.63; 95% CI 9.14–23.42; p < 0.00001) as shown in Figure 2.

Forest plot for the association of *HLA‐B*15:02* with carbamazepine‐induced cutaneous adverse drug reactions. cADRs, cutaneous adverse drug reactions; HLA, human leukocyte antigen; M‐H, Mantel–Haenssel method.

Subgroup analysis further revealed that significantly increased risk of cADRs was driven from SJS/TEN (OR 26.01; 95% CI 15.88–42.60; p < 0.00001) but not from MPE (OR 1.56; 95% CI 0.95–2.55; p = 0.08) or DRESS (OR 1.97; 95% CI 0.36–10.87; p = 0.43) (Figure 3).

Forest plot for the association of *HLA‐B*15:02* with carbamazepine‐induced different forms of cutaneous adverse drug reactions. cADRs, cutaneous adverse drug reactions; DRESS, drug reaction with eosinophilia and systemic symptoms; HLA, human leukocyte antigen; M‐H, Mantel–Haenssel method; MPE, maculopapular exanthema; SJS, Stevens−Johnson syndrome; TEN, toxic epidermal necrolysis.

Case‐patients carrying the HLA‐B*15:02 allele were associated with a significantly increased risk of cADRs compared to controls in both Asian (OR 14.84; 95% CI 8.95–24.61; p < 0.00001) and Caucasian patients (OR 11.65; 95% CI 1.68–80.70; p = 0.01), although the risk was slightly higher in patients of Asian ethnicities (Figure 4).

Forest plot for the association of *HLA‐B*15:02* with carbamazepine‐induced cutaneous adverse drug reactions in different ethnicities. cADRs, cutaneous adverse drug reactions; HLA, human leukocyte antigen; M‐H, Mantel–Haenssel method.

Association of HLA‐B15:21, HLA‐B38:02, or HLA‐B40:01* with CBZ‐induced cADRs

It was found that only the HLA‐B*15:21 allele was associated with significantly increased risk of cADRs (OR 5.37; 95% CI 2.02–14.28; p = 0.0008) but the other alleles were not found to have any significant associations (for HLA‐B*38:02: OR 0.92; 95% CI 0.46–1.83; p = 0.81; for HLA‐B*40:01: OR 0.66; 95% CI 0.40–1.08; p = 0.10) (Figure 5).

Forest plot for the association of *HLA‐B*15:21*, *HLA‐B*38:02* or *HLA‐B*40:01* with carbamazepine‐induced cutaneous adverse drug reactions. cADRs, cutaneous adverse drug reactions; HLA, human leukocyte antigen; M‐H, Mantel–Haenssel method.

Association of HLA‐B46:01* or HLA‐B58:01* with CBZ‐induced cADRs

It was also found that neither HLA‐B*46:01 (OR 0.84; 95% CI 0.60–1.17; p = 0.30) nor HLA‐B*58:01 (OR 0.70; 95% CI 0.29–1.69; p = 0.43) allele was associated with significantly increased risk of cADRs as shown in Figure S1.

Association of HLA‐B15:11, HLA‐A24:02, or HLA‐A31:01* with CBZ‐induced cADRs

It was further found that both the HLA‐B*15:11 and HLA‐A*31:01 alleles were associated with significantly increased risk of cADRs (for HLA‐B*15:11: OR 6.08; 95% CI 2.28–16.23; p = 0.0003; for HLA‐A*31:01: OR 5.92; 95% CI 4.35–8.05; p < 0.00001) but the HLA‐A*24:02 allele was not found to have any significant association (OR 1.04; 95% CI 0.82–1.31; p = 0.77) (Figure 6).

Forest plot for the association of *HLA‐B*15:11*, *HLA‐A*24:02,* or *HLA‐A*31:01* with carbamazepine‐induced cutaneous adverse drug reactions. cADRs, cutaneous adverse drug reactions; HLA, human leukocyte antigen; M‐H, Mantel–Haenssel method.

Multivariate analysis between HLA‐B15:02* and cADRs adjusted for gender and age

In the meta‐regression analysis, the gender had a statistically significant impact on the OR of HLA‐B 15:02, but there was no significant effect of age on the estimated OR of HLA‐B 15:02 (Figure S1). The studies that had a higher percentage of males in their sample had lower OR of HLA‐B 15:02 than other studies (p = 0.0304). When the variable age was incorporated into model 2, the performance of fitting was not better than model 1 (likelihood ratio test had p value >0.05). However, there was a trend showing the potential impact of variable age in model 2, whose F statistics resulted in a p value = 0.0605. The impact of gender was once again confirmed in model 2 by the permutation test (F and CE _gender had p values equal to 0.0605 and 0.0320, respectively) (Table S1).

Heterogeneity, sensitivity, and publication bias

Since various HLA genetic models were used to assess the aggregated risk of cADRs, different degrees of heterogeneity (very low to high) were found in this analysis. However, it is assumed that in the case of a high level of heterogeneity, many confounding factors such as age, race, dose of CBZ, comorbidity, co‐medications, molecular technologies applied to detect HLA variants, etc., might contribute to the high degree of heterogeneity. From the sensitivity analysis it was found that no single study affected either the pooled risk or level of heterogeneity. There was no publication bias as determined from the funnel plot (Figure S1).

DISCUSSION

Of nine HLA alleles, as investigated in this analysis, the results indicate that four HLA variants (HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, and HLA‐A*31:01) are strongly associated with increased risk of cADRs in patients taking CBZ. The highest strong association (~15‐fold) is found for the patients carrying the HLA‐B*15:02 allele with CBZ‐induced cADRs. These results were found predominantly from Asian studies (35 studies) compared to Caucasian studies (2 studies), indicating that Asian patients might be at greater risk than Caucasian patients. The results of the current analysis also firmly established that HLA‐B*15:02 is a phenotypic biomarker since it was strongly associated with increased risk of CBZ‐induced SJS or TEN (~26‐fold) but not the other adverse events such as MPE or DRESS. These findings are consistent with previous meta‐analyses and suggestions also. ¹ , ¹¹ , ¹² , ¹³ , ¹⁷ Our findings may be considered superior to previous analyses in terms of power and robustness since the aggregated risk was measured from a relatively large sample size (total studies = 38, consisting of 1346 cases and 3138 controls).

In addition, the strong associations of HLA‐B*15:11 and HLA‐A*31:01 with CBZ‐induced cADRs as found in the present analysis are also in line with the findings of previous meta‐analyses, though our findings were aggregated from a larger sample size. ⁵ , ¹¹ , ¹³ , ¹⁶ Although no meta‐analysis was found in the literature, the findings of our study indicate a strong relationship between the HLA‐B*15:21 allele and CBZ‐induced cADRs and may be considered a novel insight. However, it is important to note here that the prevalence of this allele is very low in major populations (~0.0003% in European Caucasians, ~0.01% in Chinese, ~0.03% in South Asians), and is not reported in African and East Asian populations, which may restrict assessment of such associations in these populations.

Previous meta‐analyses found HLA‐A*24:02, HLA‐B*40:01, HLA‐B*46:01, and HLA‐B*58:01 as strong protective biomarkers; however, the present analysis found a trend towards reduction of risk but did not reach statistical significance, suggesting conducting more research is needed to establish such associations. A meta‐analysis conducted by Wang et al. ⁵ found a strong protective association between HLA‐B*40:01, HLA‐B*46:01, or HLA‐B*58:01 with CBZ‐induced SJS/TEN in Asian populations. Another meta‐analysis conducted by Grover et al. ¹¹ only found a significant protective association between HLA‐B*40:01 allele carriers and CBZ‐induced cADRs in Asian patients. Both of these analyses were conducted on a relatively small sample size restricted to Asian populations. In contrast, our analyses included a relatively large sample size compared to previous analyses and was not restricted to any ethnicities. Although there was a trend towards a reduction in the risk of cADRs for the patients who carried HLA‐B*40:01, HLA‐B*46:01, or HLA‐B*58:01 allele as revealed in the present analysis, future studies are warranted to confirm these findings.

The cADRs (e.g., SJS, TEN, MPE, or DRESS) could be minimized or eradicated considerably if HLA‐specific genetic information is known before or during the prescription of CBZ. Since our results robustly established strong associations of HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, and HLA‐A*31:01 with CBZ‐induced cADRs, clinicians and policymakers should consider our findings to generate national and international guidelines for the implementation of precision medicine of CBZ therapy by proposing a panel of HLA genetic testing as supported by this study. Although some countries, including Thailand, have national guidelines for screening HLA‐B*15:02 before CBZ therapy, other risk alleles such as HLA‐B*15:11, HLA‐B*15:21, and HLA‐A*31:01 are usually not uniformly covered in the guidelines. ¹ The findings of the present analysis reinforce the consideration of a panel of HLA genetic variants (i.e., HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, and HLA‐A*31:01) for the reduction of CBZ‐induced cADRs substantially and should revise the national and international guidelines accordingly.

Besides, the impact of gender on the risk of severe cutaneous adverse drug reactions (SCARs) was also reported by other authors ²⁵ , ²⁶ , ²⁷ and is consistent with the findings of the present analysis. Hsu et al. ²⁸ found a statistically significant sensitivity to SCARs in females compared to males in the American population. Kannenberg et al. ²⁹ observed the dominance of females over males in SCARs patients in the South African population. The same result was also found in Japanese patients. ³⁰ The impact of gender can be hypothetically explained by the hormonal or genetic differences between males and females. ²⁶ However, further studies are needed in order to clearly understand the explanatory biological processes.

The present analysis observed a trend towards the impact of variable age on SCARs. Many authors also confirmed the role of age on the development of SCARs. ³¹ , ³² , ³³ Even so, most researchers believe that the effect of age was actually just a consequence of the fact that older patients tend to have more drugs and chronic diseases than younger ones. Therefore, older patients might have a higher possibility of developing SCARs.

CBZ is generally administered as long‐term therapy for the clinical conditions for which it is indicated, therefore safety requirements should be of high priority. Since certain HLA variants cause severe adverse events, as evidenced in this analysis, mandating considering either preemptive or reactive genetic screening of selective HLA alleles (HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, and HLA‐A*31:01) among populations at high risk, especially those from Asian countries, is recommended to optimize the safety of CBZ. Since the prevalence of HLA‐B*15:02 is comparatively high in Asian populations, particularly in Southeast populations compared to Caucasians as described elsewhere ¹ and is also supportive as found in this analysis (~25% vs. ~3%), the pharmacogenomic testing of HLA‐B*15:02 would be cost‐effective in these specific populations before prescribing CBZ, which is in line with recommendations of a recent cost‐effectiveness analysis. ³⁴ Although the HLA‐A*31:01 allele is considered a universal biomarker, its prevalence is slightly higher in European populations compared to Asian populations, as reported elsewhere. ¹ Other strongly associated alleles (e.g., HLA‐B*15:11 and HLA‐B*15:21) have a comparatively low prevalence in Asian populations (~2% for HLA‐B*15:11 and ~3% for HLA‐B*15:21) as found in this analysis. These alleles were not reported in European populations, which is also supportive from a recent comprehensive review of HLA. ¹

Some studies suggest that the pharmacogenomic testing of HLA‐B*15:02 would be more cost‐effective if the prevalence of this allele was more than 5% or at least greater than 2.5%. ¹ , ³⁵ , ³⁶ This suggestion might be applicable to other HLA risk alleles (e.g., HLA‐B*15:11 or HLA‐B*15:21), although this has not yet been quantified. Despite the cost‐effectiveness issue of pharmacogenetic testing, there is a strong need to consider some other factors, such as ethical, legal, and social issues (ELSI), pharmacogenomics education, and so on, before implementation of such pharmacogenetic screening in real clinical settings. ¹ , ¹² Many countries, including Thailand, are advancing precision medicine initiatives, especially in Asian regions. Thailand has become the focal point for innovating new technologies to accelerate the translation of pharmacogenomics into routine clinical practice. ³⁷ The innovation of the PPM card, which is a pharmacogenomics identity card from the Division of Pharmacogenomics and Personalized Medicine (PPM) of Mahidol University in Thailand led by Dr. Chonlaphat Sukasem as described elsewhere ¹ , ³⁸ may expedite the implementation of precision medicine to the bedside and may be considered in other parts of the world for advancing precision medicine initiatives.

There are some limitations of this analysis. Although the present analysis focused on and addressed nine HLA variants with CBZ‐induced cADRs, other potential HLA risk alleles (e.g., HLA‐B*57:01, HLA‐Cw*08:01, and HLA‐DRB1*12:02) were not included in this analysis which may increase the risk of developing cADRs for patients taking CBZ. ¹ , ³⁹ Further, the clinical efficacy and safety of CBZ may also be affected by the genetic polymorphisms of CYP3A4/5, CYP2C8, ABCB1, etc., which were not considered in this analysis. ⁴⁰ , ⁴¹

CONCLUSIONS

The results of this study show a strong association between HLA‐B*15:02, HLA‐B*15:11, HLA‐B*15:21, or HLA‐A*31:01 allele with CBZ‐induced cADRs. The most substantial, robust evidence has been found between HLA‐B*15:02 allele and CBZ‐induced SJS/TEN. Pharmacogenetic testing of particular HLA alleles before initiation of CBZ therapy may be beneficial to patients and may help to eradicate cADRs substantially. Such HLA genetic status information may assist clinicians in determining the optimal therapy of CBZ.

CONFLICT OF INTEREST

The authors declared no competing interests for this work.

ETHICAL APPROVAL

Ethical approval was not required since the study comprised a meta‐analysis of published results.

AUTHOR CONTRIBUTIONS

M.B. wrote the manuscript. C.S. and M.B. designed the research. C.S., M.B., M.E., and J.S. performed the research. M.B., M.E., and J.S. analyzed the data.

Supporting information

Figure S1

Figure S2

Figure S3

Click here for additional data file.^{(585.6KB, pdf)}

Table S1

Table S2

Click here for additional data file.^{(32.2KB, docx)}

ACKNOWLEDGMENTS

The authors thank the staff of the Division of Pharmacogenomic and Personalized Medicine of Ramathibodi Hospital.

Biswas M, Ershadian M, Shobana J, et al. Associations of HLA genetic variants with carbamazepine‐induced cutaneous adverse drug reactions: An updated meta‐analysis. Clin Transl Sci. 2022;15:1887‐1905. doi: 10.1111/cts.13291

Funding information

This study was supported by grants from: (1) Mahidol University International Postdoctoral Fellowship, Mahidol University; (2) Faculty of Medicine, Ramathibodi Hospital, Mahidol University; (3) the Health System Research Institute under Genomics Thailand Strategic Fund; and (4) The International Research Network‐The Thailand Research Fund (IRN60W003).

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PERMALINK

Associations of HLA genetic variants with carbamazepine‐induced cutaneous adverse drug reactions: An updated meta‐analysis

Mohitosh Biswas

Maliheh Ershadian

John Shobana

Ai‐Hoc Nguyen

Chonlaphat Sukasem

Abstract

Study Highlights.

INTRODUCTION

METHODS

Literature search strategy

Inclusion and exclusion criteria of the studies

Data extraction, validity, and quality assessment

Assessment of aggregated risk, heterogeneity, sensitivity, and publication bias

RESULTS

Selection of studies

FIGURE 1.

Characteristics of included studies

TABLE 1.

Association of HLA‐B*15:02 with CBZ‐induced cADRs

FIGURE 2.

FIGURE 3.

FIGURE 4.

Association of HLA‐B*15:21, HLA‐B*38:02, or HLA‐B*40:01 with CBZ‐induced cADRs

FIGURE 5.

Association of HLA‐B*46:01 or HLA‐B*58:01 with CBZ‐induced cADRs

Association of HLA‐B*15:11, HLA‐A*24:02, or HLA‐A*31:01 with CBZ‐induced cADRs

FIGURE 6.

Multivariate analysis between HLA‐B*15:02 and cADRs adjusted for gender and age

Heterogeneity, sensitivity, and publication bias

DISCUSSION

CONCLUSIONS

CONFLICT OF INTEREST

ETHICAL APPROVAL

AUTHOR CONTRIBUTIONS

Supporting information

ACKNOWLEDGMENTS

References

REFERENCES

REFERENCES OF STUDIES INCLUDED FOR META‐ANALYSIS

Associated Data

Supplementary Materials

ACTIONS

PERMALINK

RESOURCES

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Links to NCBI Databases

Association of HLA‐B15:02* with CBZ‐induced cADRs

Association of HLA‐B15:21, HLA‐B38:02, or HLA‐B40:01* with CBZ‐induced cADRs

Association of HLA‐B46:01* or HLA‐B58:01* with CBZ‐induced cADRs

Association of HLA‐B15:11, HLA‐A24:02, or HLA‐A31:01* with CBZ‐induced cADRs

Multivariate analysis between HLA‐B15:02* and cADRs adjusted for gender and age