raremaprare-disease reference indexOrphadata 2026-06-23 · HPO 2026-09-01
ORPHA:79304

Progressive familial intrahepatic cholestasis type 2

Synonyms: BSEP deficiency · PFIC2

Type
Clinical subtype
Group
Subtype of disorder
Inheritance
Autosomal recessive
Age of onset
Infancy, Neonatal
Status
active

Progressive familial intrahepatic cholestasis type 2 (PFIC2), a type of progressive familial intrahepatic cholestasis (PFIC), is a severe, neonatal, hereditary disorder in bile formation that is hepatocellular in origin and not associated with extrahepatic features. Initially, PFIC2 was reported under the name Byler syndrome.

1

Names in Orphadata languages

12 of 12 languages
LangNameSynonyms
enProgressive familial intrahepatic cholestasis type 2BSEP deficiency · PFIC2
frCholestase intrahépatique familiale progressive type 2Déficit en BSEP · PFIC2
deCholestase, intrahepatische progressive, familiäre, Typ 2
esColestasis intrahepática familiar progresiva tipo 2
itColestasi intraepatica familiare progressiva, tipo 2Deficit di BSEP · PFIC2
nlProgressieve familiale intrahepatische cholestase type 2BSEP-deficiëntie · PFIC2
ptColestase intra-hepática progressiva familiar tipo 2
plPostępująca rodzinna wewnątrzwątrobowa cholestaza typu 2Niedobór BSEP · PFIC2
csProgresivní familiární intrahepatální cholestáza, typ 2Deficit BSEP · PFIC2
ukПрогресуючий сімейний внутрішньопечінковий холестаз, тип 2Дефіцит BSEP · PFIC2
zh进行性家族性肝内胆汁淤积2型BSEP缺乏
trİlerleyici ailesel intrahepatik kolestaz tip 2PFIC2 · BSEP eksikliği

Definition in:

2

Cross-references

qualifier = Orphanet mapping relation
SourceCodeQualifierICD relationValidation
OMIM601847Evalidated
ICD-10K76.8NTBTattributedvalidated
ICD-115C58.03NTBTindexvalidated
MONDO0011156Evalidated
MeSHC535934Evalidated
UMLSC3489789Evalidated
GARD1288Evalidated

E exact · NTBT this ORPHAcode is narrower than the target · BTNT broader than the target · ND not decided.

3

Classification

Preferential parent (Orphanet linearisation):

Parents in the classifications (1):

No children.

4

Genes

1 direct
GeneAssociationStatusHGNCEnsemblOMIMLocusNameSource of validation
ABCB11Disease-causing germline mutation(s) (loss of function) inAssessedHGNC:42ENSG000000737346032012q31.1ATP binding cassette subfamily B member 119806540[PMID]_15791618[PMID]
5

Prevalence and incidence

1 record
TypeClassValueAreaQualificationValidationSource
Point prevalence1-9 / 100 000—EuropeClass onlyNot yet validatedORPHANET

Value is Orphadata's ValMoy: the mean estimate per 100 000 for prevalence and incidence, the number of cases or families for case reports.

6

HPO phenotypes

Orphanet has no HPO annotation for this code in this release.

7

Sources for this card