Autoimmune Lymphoproliferative Syndrome

Clinical characteristics.

Autoimmune lymphoproliferative syndrome (ALPS), caused by defective lymphocyte homeostasis, is characterized by the following:

• Non-malignant lymphoproliferation (lymphadenopathy, hepatosplenomegaly with or without hypersplenism) that often improves with age
• Autoimmune disease, mostly directed toward blood cells
• Lifelong increased risk for both Hodgkin and non-Hodgkin lymphoma

In ALPS-FAS (the most common and best-characterized type of ALPS, associated with heterozygous germline pathogenic variants in FAS), non-malignant lymphoproliferation typically manifests in the first years of life, inexplicably waxes and wanes, and then often decreases without treatment in the second decade of life; in many affected individuals, however, neither splenomegaly nor the overall expansion of lymphocyte subsets in peripheral blood decreases. Although autoimmunity is often not present at the time of diagnosis or at the time of the most extensive lymphoproliferation, autoantibodies can be detected before autoimmune disease manifests clinically.

In ALPS-FAS caused by homozygous or compound heterozygous (biallelic) pathogenic variants in FAS, severe lymphoproliferation occurs before, at, or shortly after birth, and usually results in death at an early age.

ALPS-sFAS, resulting from somatic FAS pathogenic variants in selected cell populations, notably the alpha/beta double-negative T cells (α/β-DNT cells), appears to be similar to ALPS-FAS resulting from heterozygous germline pathogenic variants in FAS, although lower incidence of splenectomy and lower lymphocyte counts have been reported in ALPS-sFAS and no cases of lymphoma have yet been published.

Diagnosis/testing.

The diagnosis of ALPS is based on the following:

• Clinical findings
• Laboratory abnormalities:
  • Abnormal biomarker testing (soluble interleukin-10 [IL-10], Fas ligand [FasL], IL-18, and vitamin B₁₂)
  • Defective in vitro tumor necrosis factor receptor superfamily member 6 (Fas)-mediated apoptosis
  • T cells that express the alpha/beta T-cell receptor but lack both CD4 and CD8 (so-called "α/β-DNT cells")
• Identification of pathogenic variants in genes relevant for the Fas pathway of apoptosis. These genes include FAS (either germline or somatic pathogenic variants), CASP10, and FASGL.
  Up to 20% of those with clinical ALPS have not had a genetic etiology identified.

Management.

Treatment of manifestations: Current management is focused on monitoring for and treatment of lymphoproliferation, hypersplensim, and lymphomas and management of cytopenias and other autoimmune diseases. Corticosteroids and immunosuppressive therapy do not decrease lymphadenopathy long term and are generally reserved for severe complications of lymphoproliferation (e.g., airway obstruction, significant hypersplenism associated with splenomegaly) and/or autoimmune manifestations. Experience with sirolimus suggests that it is the preferred agent in treating lymphoproliferation in a more sustained manner, including maintenance of remission following a period of discontinued use of sirolimus; however, sirolimus is not without side effects. Lymphoma is treated with conventional protocols. Autoimmune cytopenias and other autoimmune diseases are typically treated by immune suppression with corticosteroids as well as corticosteroid-sparing agents if prolonged treatment of autoimmune cytopenias is required and/or in cases of refractory cytopenias.

Splenectomy is reserved as an option of last resort in the treatment of life-threatening refractory cytopenias and/or severe hypersplenia because of the high risk of recurrence of cytopenias and sepsis post-splenectomy in persons with ALPS.

Prevention of primary manifestations: Bone marrow (hematopoietic stem cell) transplantation (BMT/HSCT), the only curative treatment for ALPS, has to date mostly been performed on those with severe clinical phenotypes such as ALPS-FAS caused by biallelic pathogenic variants, those with severe and/or refractory autoimmune cytopenias, those with lymphoma, and those who have developed complications from (often long-term) immunosuppressive therapy.

Prevention of secondary complications: Vaccinations pre-splenectomy (with consideration of post-splenectomy boost vaccinations) and penicillin prophylaxis are strongly recommended for individuals who undergo splenectomy.

Surveillance: Clinical assessment and imaging and laboratory studies for manifestations of lymphoproliferation and autoimmunity; specialized imaging studies to detect malignant transformation.

Agents/circumstances to avoid: Splenectomy is discouraged as it typically does not lead to permanent remission of autoimmunity and is associated with increased risk of infection. Aspirin and other nonsteroidal anti-inflammatory drugs should be used with caution in individuals with immune thrombocytopenia as they can interfere with platelet function.

Evaluation of relatives at risk: If the pathogenic variant(s) have been identified in a family member with ALPS, it is appropriate to perform molecular genetic testing on at-risk relatives to allow for early diagnosis and treatment.

Pregnancy management: Assessment of the risks and benefits of treating a woman who has ALPS with corticosteroids, mycophenylate mofitil, or sirolimus during pregnancy must take into consideration the potential teratogenic risks to the fetus.

Genetic counseling.

Inheritance of ALPS-CASP10, most cases of ALPS-FAS, and some cases of ALPS-FASLG is autosomal dominant. Each child of an individual with autosomal dominant ALPS has a 50% chance of inheriting the pathogenic variant. Inheritance of most cases of ALPS-FASLG and severe ALPS associated with biallelic FAS pathogenic variants is autosomal recessive. The parents of an individual with autosomal recessive ALPS are likely to be heterozygotes, in which case each has one FAS pathogenic variant; these parents may have ALPS-related findings or may be clinically asymptomatic.

Prenatal testing for pregnancies at increased risk is possible if the pathogenic variant(s) have been identified in an affected family member.

ALPS-FAS can also be the result of somatic mosaicism. Somatic pathogenic variants have not been reported in ALPS-FASLG or ALPS-CASP10 to date.

Suggestive Findings

The diagnosis of autoimmune lymphoproliferative syndrome (ALPS) is based on a constellation of clinical findings, laboratory abnormalities, and identification of pathogenic variants in genes relevant for the tumor necrosis factor receptor superfamily member 6 (Fas) pathway of apoptosis.

ALPS should be suspected in individuals with combinations of the following [Bleesing 2003, Rieux-Laucat et al 2003]:

• Chronic non-malignant lymphoproliferation
  • Chronic and/or recurrent lymphadenopathy
  • Splenomegaly with/without hypersplenism
  • Hepatomegaly
  • Lymphocytic interstitial pneumonia (less common)
• Autoimmune disease
  • Cytopenia, particularly combinations of autoimmune hemolytic anemia (AIHA), immune thrombocytopenia (ITP), and autoimmune neutropenia
    Note: The combination of AIHA and ITP is often referred to as Evans syndrome.
  • Other, including autoimmune hepatitis, autoimmune glomerulonephritis, autoimmune thyroiditis and (less commonly) uveitis and Guillain-Barré syndrome
• Lymphoma, both Hodgkin lymphoma and non-Hodgkin lymphoma
• Skin rashes, often but not exclusively of an urticarial nature
• Family history of ALPS or ALPS-like features

Establishing the Diagnosis

The diagnosis of ALPS is established in a proband who meets the clinical diagnostic criteria, which may include identification of a heterozygous pathogenic variant or biallelic pathogenic variants in one of the genes listed in Table 1.

A revised set of diagnostic criteria have been proposed [Oliveira et al 2010]:

• A definitive diagnosis of ALPS is based on the presence of both required criteria and one primary accessory criterion (see following).
• A probable diagnosis is based on the presence of both required criteria plus one secondary accessory criterion.

Required criteria

• Chronic (>6 months) non-malignant, noninfectious lymphadenopathy and/or splenomegaly
• Elevated α/β-DNT cells with normal or elevated lymphocyte counts

Primary accessory criteria

• Defective lymphocyte apoptosis (repeated at least once)
• Germline or somatic pathogenic variants in CASP10, FAS, or FASLG

Secondary accessory criteria

• Elevated levels of one of the following:
  • Plasma soluble FASL
  • Plasma interleukin-10
  • Serum vitamin B₁₂
  • Plasma interleukin-18
• Typical immunohistologic findings as determined by an experienced hematopathologist
• Autoimmune cytopenias with elevated (polyclonal) immunoglobulin G levels
• Positive family history

Molecular Genetic Testing

Molecular genetic testing approaches can include serial single-gene testing, use of a multigene panel, and more comprehensive genomic testing.

Serial single-gene testing. Sequence analysis of the gene of interest is performed first and followed by gene-targeted deletion/duplication analysis if no pathogenic variant is found.

• For this disorder, it is recommended that FAS be tested first. See Figure 1 for algorithm.
• In the absence of a germline FAS pathogenic variant, FAS sequencing in sorted α/β-DNT cells to detect somatic pathogenic variants should be performed. If present, the diagnosis of ALPS-sFAS is established.
• If neither a germline nor a somatic FAS pathogenic variant is identified, CASP10 and FASLG should be tested next. The detection of germline pathogenic variants in either CASP10 or FASLG establishes the diagnosis of ALPS-CASP10 or ALPS-FASLG, respectively.
• A Fas-mediated apoptosis assay should be performed if germline pathogenic variants in CASP10 or FASLG are not identified (repeat if necessary, noting the influence of concomitant immunosuppressive therapy). If abnormal, the diagnosis of ALPS-U is established.

Figure 1.

One proposed algorithm for the diagnostic evaluation of an individual suspected of having ALPS

Notes: (1) Absence of a positive family history is suggestive of ALPS-sFAS. (2) Loss of heterozygosity of FAS pathogenic variants has been observed in blood cells. (3) FAS somatic pathogenic variants in selected cell populations, including α/β-DNT cells, produce a phenotype similar to that caused by FAS germline pathogenic variants. (4) The presence of elevated biomarkers has not been reliably established in CASP10 or FASLG-related ALPS. (5) Thus far, somatic pathogenic variants in FAS only have been reported to cause ALPS; however, it is theoretically possible that somatic pathogenic variants in CASP10 and FASLG may also be causative.

A multigene panel that includes CASP10, FAS, FASLG, and other genes of interest (see Differential Diagnosis) may also be considered. Note: (1) The genes included in the panel and the diagnostic sensitivity of the testing used for each gene vary by laboratory and are likely to change over time. (2) Some multigene panels may include genes not associated with the condition discussed in this GeneReview; thus, clinicians need to determine which multigene panel is most likely to identify the genetic cause of the condition at the most reasonable cost while limiting identification of variants of uncertain significance and pathogenic variants in genes that do not explain the underlying phenotype. (3) In some laboratories, panel options may include a custom laboratory-designed panel and/or custom phenotype-focused exome analysis that includes genes specified by the clinician. (4) Methods used in a panel may include sequence analysis, deletion/duplication analysis, and/or other non-sequencing-based tests.

For an introduction to multigene panels click here. More detailed information for clinicians ordering genetic tests can be found here.

More comprehensive genomic testing (when available) including exome sequencing and genome sequencing may be considered. Such testing may provide or suggest a diagnosis not previously considered (e.g., mutation of a different gene or genes that results in a similar clinical presentation).

For an introduction to comprehensive genomic testing click here. More detailed information for clinicians ordering genomic testing can be found here.

Table 1.

Molecular Genetic Testing Used in ALPS

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Gene 1	ALPS Type	Proportion of ALPS Attributed to Pathogenic Variants in Gene	Proportion of Pathogenic Variants 2 Detectable by Method 3
			Sequence analysis 4	Gene-targeted deletion/duplication analysis 5
CASP10	ALPS-CASP10	3%-6% 6, 7	5/5	Unknown 8
FAS	ALPS-FAS	65%-70% 9, 10	>90%	3%-4%
	ALPS-sFAS	~15%-20% 11, 12
FASLG	ALPS-FASLG	<1% 13	7/7	Unknown 8
Unknown	ALPS-U	~20% 14	NA

1.

See Table A. Genes and Databases for chromosome locus and protein.

2.

See Molecular Genetics for information on allelic variants detected in this gene.

3.

Pathogenic variants listed in Human Gene Mutation Database (HGMD) considered to assess the proportion of variants detectable by each methodology

4.

Sequence analysis detects variants that are benign, likely benign, of uncertain significance, likely pathogenic, or pathogenic. Pathogenic variants may include small intragenic deletions/insertions and missense, nonsense, and splice site variants; typically, exon or whole-gene deletions/duplications are not detected. For issues to consider in interpretation of sequence analysis results, click here.

5.

Gene-targeted deletion/duplication analysis detects intragenic deletions or duplications. Methods that may be used include: quantitative PCR, long-range PCR, multiplex ligation-dependent probe amplification (MLPA), and a gene-targeted microarray designed to detect single-exon deletions or duplications.

6.

Note that of the two pathogenic variants in CASP10 originally reported [Wang et al 1999], p.Val410Ile was subsequently determined not to cause ALPS [Zhu et al 2006].

7.

In two individuals, ALPS was presumed to result from coinherited pathogenic variants in FAS and CASP10 that were hypothesized to cooperate in causing ALPS [Cerutti et al 2007].

8.

No data on detection rate of gene-targeted deletion/duplication analysis are available.

9.

Generally heterozygous germline pathogenic variants occur in FAS. Homozygous / compound heterozygous FAS germline pathogenic variants are also observed and are typically associated with a severe phenotype [Rieux-Laucat et al 1995, Kasahara et al 1998, van der Burg et al 2000, Bleesing 2003, Rieux-Laucat et al 2003].

10.

Individuals with an inherited germline pathogenic variant in addition to a second acquired pathogenic variant [Magerus-Chatinet et al 2011], as well as individuals exhibiting somatic loss of heterozygosity [Magerus-Chatinet et al 2011, Hauck et al 2013], have been also described.

11.

Somatic pathogenic variants are observed in selected cell populations, including α/β-DNT cells [Holzelova et al 2004, Rössler et al 2005, Dowdell et al 2010], but rarely in other lymphocyte subsets and not in non-lymphocytes.

12.

Detection of FAS somatic pathogenic variants requires specialized genetic testing of α/β-DNT cells sorted by either flow cytometric immunophenotyping or by magnetic bead immunophenotyping.

13.

Homozygous or heterozygous germline pathogenic variants in FASLG have been reported: individuals with biallelic homozygous pathogenic variants have especially severe disease [Magerus-Chatinet et al 2013]. A review of reported cases identifies a total of eight cases (including 2 sibs). In five of seven probands, ALPS was associated with homozygous FASLG pathogenic variants and an autosomal recessive inheritance pattern (see Molecular Pathogenesis).

14.

Approximately 20%-25% of individuals with ALPS lack a genetic diagnosis [Bleesing 2003].

Clinical Description

Autoimmune lymphoproliferative syndrome (ALPS) can be considered a prototypic disorder of defective lymphocyte homeostasis [Sneller et al 1992, Fisher et al 1995, Rieux-Laucat et al 1995].

The manifestations are lymphadenopathy, hepatosplenomegaly with or without hypersplenism, and autoimmune disease, mostly directed toward blood cells. In addition, the risk of lymphoma is increased.

Genotype-Phenotype Correlations

ALPS-FAS. The clinical lymphoproliferative and autoimmune phenotype of ALPS is associated with pathogenic variants which affect any domain of Fas. Lymphomas, in contrast, seem thus far to be associated mostly with pathogenic variants affecting the intracellular domains of Fas, although independent confirmation is required [Straus et al 2001, Price et al 2014].

In the majority of affected individuals, heterozygous FAS pathogenic variants are associated with ALPS-FAS by the mechanism of dominant-negative interference; however, with certain pathogenic variants affecting extracellular domain, the proposed mechanism is haploinsufficiency. In the latter case, the ALPS clinical phenotype may be less severe, linked to less defective in vitro apoptosis [Kuehn et al 2011]. (For further discussion see Molecular Pathogenesis.)

ALPS-FASLG and ALPS-CASP10. Because of their rarity, genotype-phenotype correlations are not clearly established for FASLG and CASP10 pathogenic variants.

Penetrance

ALPS-FAS. A distinction needs to be made between the penetrance of the cellular phenotype (defective Fas-mediated apoptosis) and the penetrance of the clinical phenotype (i.e., ALPS).

Family studies to date suggest that penetrance for the defective Fas-mediated apoptosis cellular phenotype approximates 100% (i.e., every individual heterozygous for an inherited [germline] pathogenic variant has defective apoptosis) whereas the penetrance for the clinical phenotype is reduced because a significant proportion of relatives heterozygous for the pathogenic variant have no clinical findings of ALPS. In addition, other relatives have laboratory findings of ALPS (e.g., expansion of lymphocyte subsets and/or autoantibodies) without clinical evidence of either lymphoproliferation or autoimmunity [Infante et al 1998, Jackson et al 1999, Bleesing et al 2001].

The factors that determine the penetrance of clinical ALPS are not entirely understood. Penetrance appears to be determined by the location and type of pathogenic variant [Rieux-Laucat et al 1999, Le Deist 2004]. In initial studies, the highest penetrance (70%-90%) for the clinical phenotype occurred with missense variants affecting the intracellular domains (ICD), followed by variants leading to truncation of the ICDs. For pathogenic variants affecting the extracellular domains (ECD) the highest penetrance was estimated at approximately 30% [Jackson et al 1999].

In the French cohort ECD pathogenic variants had a penetrance of 52% (higher than previous data) and ICD pathogenic variants had a 63% penetrance (lower than previously reported). The penetrance of missense variants affecting the death domain (part of the ICD) was 73% [Jackson et al 1999, Neven et al 2011].

The reduced penetrance for ALPS in some families suggests that one or more additional pathogenic factors interact with defective Fas-mediated apoptosis. However, the high penetrance for the clinical phenotype in certain families associated with specific types of FAS pathogenic variants (e.g., missense variants affecting the death domain) casts doubt on that assumption, suggesting that under certain conditions a single defect in Fas-mediated apoptosis is sufficient to cause ALPS [Infante et al 1998, Jackson et al 1999, Le Deist 2004].

An observation that may shed more light on the issue of penetrance, particularly as it relates to pathogenic variants affecting intracellular vs extracellular domains (as well as on pathogenesis and natural history of ALPS): in a small subset of affected individuals, clinical disease appeared to develop as a consequence of both an inherited heterozygous (germline) FAS pathogenic variant and a somatic genetic event in the second FAS allele [Magerus-Chatinet et al 2011]. Analysis of α/β-DNT cells revealed that the second genetic event involved either a somatic missense or nonsense variant in the second FAS allele or loss of heterozygosity by telomeric uniparental disomy of chromosome 10. These observations were recently confirmed in a family with ALPS in which affected individuals had a heterozygous germline FAS start codon variant with somatic loss of heterozygosity [Hauck et al 2013].

A gender inequality in ALPS has been observed. In the French cohort, the likelihood of a male with a heterozygous germline FAS pathogenic variant developing ALPS was about 75%, compared to 51% for females. In the NIH cohort the likelihood of developing ALPS for males and females was 69% and 46%, respectively. The ratio of affected males to affected females was 2.2 (French cohort) and 1.6 (NIH cohort). Lastly, in the French cohort, the ratio of affected males to affected females increased from 2.2. to 2.9 if autoimmune disease was present and to 4.2 if autoimmune disease included autoimmune cytopenias [Neven et al 2011, Price et al 2014].

Anticipation

Anticipation has not been documented in ALPS.

Nomenclature

ALPS has also been referred to as Canale-Smith syndrome.

Prevalence

Nearly 500 patients with ALPS in more than 300 families have been reported worldwide with no racial or ethnic predilection. However, the true prevalence of ALPS is still unknown as many individuals are undiagnosed or misdiagnosed [Shah et al 2014].

Evaluations Following Initial Diagnosis

To determine the presence and extent of disease and needs in an individual diagnosed with autoimmune lymphoproliferative syndrome (ALPS), the following evaluations are recommended:

• Complete blood counts and flow cytometric immunophenotyping of lymphocytes, especially with regard to α/β-DNT cells, in combination with physical examination and imaging studies to assess lymphadenopathy and hepatosplenomegaly
• If significant lymphadenopathy is present, more extensive diagnostic procedures to detect lymphoma, especially if constitutional symptoms (e.g., fever, night sweats, weight loss) are present
• Measurement of autoantibodies to assess for autoimmunity
• Consultation with a clinical geneticist and/or genetic counselor

Treatment of Manifestations

In the absence of curative treatment, current management is focused on the following:

• Monitoring for and treatment of lymphoproliferation, hypersplensim, and lymphomas
• Management of cytopenias and other autoimmune diseases [Madkaikar et al 2011, Rao & Oliveira 2011, Teachey 2012]

Monitoring for and treatment of lymphoproliferation and hypersplenism

• Manifestations of lymphoproliferation require close clinical observation, as well as serial CT and PET scans every two to three years.
• Biopsy is indicated whenever there is a clinical suspicion of lymphoma.
• Corticosteroids and immunosuppressive drugs do not decrease lymphadenopathy long term in individuals with ALPS, and are generally reserved for severe complications of lymphoproliferation (e.g., airway obstruction, significant hypersplenism associated with splenomegaly) and/or autoimmune manifestations.
• Experience with sirolimus suggests that it is the preferred agent in treating lymphoproliferation in a more sustained manner, including for maintenance of remission after initial treatment followed by a period of discontinued use [Teachey et al 2009, Bride et al 2016]. However, sirolimus is not without side effects.
• In severe cases, more potent (lympho-depleting) agents may be required to sufficiently control lymphoproliferative manifestations. Agents include cyclophosphamide, antithymocyte globulin (ATG), and select monoclonal antibodies such as alemtuzumab (Campath^®).

Treatment of lymphoma is according to conventional protocols. The presence of defective Fas-mediated apoptosis does not appear to hinder the response to chemotherapeutic agents or radiation.

Treatment of cytopenias and other autoimmune diseases

• Autoimmune cytopenias are typically treated by immune suppression with corticosteroids as well as corticosteroid-sparing agents, if prolonged treatment of autoimmune cytopenias is required and/or in cases of refractory cytopenias.
  • Recent data from a multi-institutional study suggest that sirolimus should be considered as a first-line – corticosteroid-sparing – agent [Bride et al 2016]. Sirolimus requires monitoring for drug levels and toxic side effects.
  • Mycophenolate mofetil (MMF) can be used in cases when a less immunosuppressive drug (e.g., compared with sirolimus) seems sufficient, as steroids are tapered. In addition, if drug level and toxic side effects cannot be adequately monitored, MMF could be used as a first-line agent.
• Individuals with severe autoimmune hemolytic anemia may benefit from IVIG in combination with corticosteroids.
• Rituximab has been used successfully in the treatment of refractory cytopenias in ALPS. However, because of its immune toxicity, its use is generally avoided until other immunosuppression therapies have failed [Rao et al 2009, Rao & Oliveira 2011].
• Splenectomy is reserved as an option of last resort in the treatment of life-threatening refractory cytopenias and/or severe hypersplenia because of the high risk of recurrence of cytopenias and sepsis post-splenectomy in those with ALPS [Rao & Oliveira 2011, Price et al 2014]. Given the known risks associated with splenectomy, patients requiring this last-resort approach should be considered for curative bone marrow transplantation.
• Individuals with isolated chronic neutropenia may improve on low-dose G-CSF [Rao & Oliveira 2011]. In addition, use of a thrombopoietin (TPO) receptor agonist should be considered for isolated immune thrombocytopenia (ITP).

Prevention of Primary Manifestations

Bone marrow (hematopoietic stem cell) transplantation (BMT/HSCT) is currently the only curative treatment for ALPS. Because of the risks associated with BMT, it has so far been performed mostly in individuals with ALPS with severe clinical phenotypes, such as those with homozygous or compound heterozygous pathogenic variants in FAS, those with severe and/or refractory autoimmune cytopenias, those with lymphoma, and those who have developed complications from (often long-term) immunosuppressive therapy. It is likely, however, that individuals with undiagnosed forms of ALPS, including ALPS-FAS, have been transplanted.

Successful (reported) BMT in several individuals indicates that defective Fas-mediated apoptosis does not pose a barrier to this treatment option [Benkerrou et al 1997, Sleight et al 1998, Dowdell et al 2010].

Prevention of Secondary Complications

Vaccinations pre-splenectomy (with consideration of post-splenectomy boost vaccinations) and penicillin prophylaxis are strongly recommended for individuals who undergo splenectomy.

Surveillance

Clinical assessment, imaging, and laboratory studies outlined in Evaluations Following Initial Diagnosis can be used in surveillance for manifestations of lymphoproliferation and autoimmunity.

Specialized imaging studies such as combined PET and CT scanning in combination with clinical and laboratory surveillance may be helpful in detection of malignant transformation, keeping in mind that PET/CT scanning is often abnormal in ALPS, such that distinguishing between "typical" ALPS findings and a new malignancy (lymphoma) can be difficult [Rao & Oliveira 2011]. Because of this, careful consideration of imaging modalities that expose the patient to radiation is warranted.

Agents/Circumstances to Avoid

Splenectomy to control autoimmune cytopenias and/or massive splenomagaly is discouraged because it typically does not lead to permanent remission of autoimmunity and may be associated with an increased risk for infections. The two recent cohort studies reveal clear-cut consequences of splenectomy. In the French cohort, nine (30%) of 30 affected individuals who underwent splenectomy suffered 17 cases of severe invasive bacterial infection with four deaths after splenectomy; in the NIH cohort, 27 (41%) of 66 affected individuals suffered one or more episodes of sepsis with seven deaths. Of note: Antimicrobial prophylaxis and appropriate vaccinations did not prevent the majority of episodes of sepsis, although poor compliance was found to be a risk factor in the French cohort [Neven et al 2011, Price et al 2014].

The use of over-the-counter medications such as aspirin and other nonsteroidal anti-inflammatory drugs should be discussed with a physician as some of these medications can interfere with platelet function.

Evaluation of Relatives at Risk

It is appropriate to perform molecular genetic testing on relatives at risk for ALPS-FAS, ALPS-FASLG, or ALPS-CASP10 if the pathogenic variant has been identified in the proband.

Relatives who have the family-specific pathogenic variant should:

• Be advised of their increased risk for ALPS if the type and location of the ALPS-related pathogenic variant is predicted to have a high penetrance for clinical ALPS;
• Undergo ALPS-specific evaluations at initial diagnosis (e.g., enumeration of α/β-DNT cells, detection of autoantibodies, IL-10/soluble FasL measurement) (see Evaluations Following Initial Diagnosis);
• Be advised that ALPS-specific evaluations or other assessments may need to be repeated at regular intervals, particularly if the family member is young and/or if new health-related issues consistent with ALPS or ALPS-related complications (e.g., lymphoma) become apparent (see Surveillance).

See Genetic Counseling for issues related to testing of at-risk relatives for genetic counseling purposes.

Pregnancy Management

In addition to the risks and benefits to a woman with ALPS associated with treatment with corticosteroids, mycophenylate mofitil, or sirolimus during pregnancy, the potential teratogenic risks of these exposures to the fetus must also be weighed.

See MotherToBaby for further information on medication use during pregnancy.

Therapies Under Investigation

Search ClinicalTrials.gov in the US and EU Clinical Trials Register in Europe for access to information on clinical studies for a wide range of diseases and conditions.