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1.
J Patient Rep Outcomes ; 5(1): 65, 2021 Aug 03.
Article in English | MEDLINE | ID: mdl-34342778

ABSTRACT

BACKGROUND: A novel treatment has been developed for erythropoietic protoporphyria (EPP) (a rare condition that leaves patients highly sensitive to light). To fully understand the burden of EPP and the benefit of treatment, a novel patient reported outcome (PRO) measure was developed called the EPP-QoL. This report describes work to support the validation of this measure. METHODS: Secondary analysis of trial data was undertaken. These analyses explored the underlying factor structure of the measure. This supported the deletion of some items. Further work then explored the reliability of these factors, their construct validity and estimates of meaningful change. RESULTS: The factor analyses indicated that the items could be summarised in terms of two factors. One of these was labelled EPP Symptoms and the other EPP Wellbeing, based on the items included in the domain. EPP Symptoms had evidence to support its reliability and validity. EPP Wellbeing had poor psychometric properties. CONCLUSIONS: Based on the analysis it was recommended to drop the EPP Wellbeing domain (and associated items). EPP Symptoms, despite limitations in the development of items, showed evidence of validity. This work is consistent with the recommendations of a task force that provided recommendations regarding the development, modification and use of PROs in rare diseases.

4.
Br J Dermatol ; 169(4): 927-30, 2013 Oct.
Article in English | MEDLINE | ID: mdl-23701444

ABSTRACT

BACKGROUND: Male pattern baldness (androgenetic alopecia, AGA) is a highly heritable trait and the most common form of hair loss in humans. Eight genome-wide significant risk loci for AGA have been identified. OBJECTIVES: To determine whether a polygenic component contributes to the genetic risk for AGA. METHODS: This study used a German case-control sample for AGA, which comprised 581 severely affected patients and 617 controls, to determine the contribution of polygenic variance to AGA risk. The sample was divided evenly into discovery and test samples. An additive polygenic risk score was calculated from risk alleles with increasingly liberal P-values in the discovery dataset, which was then used to test for the enrichment of AGA risk score alleles in the independent test samples. RESULTS: The polygenic score analysis provided significant evidence for a polygenic contribution to AGA where the amount of variance explained was 1·4-4·5%. CONCLUSION: This study provides evidence for the specific contribution of a polygenic component to the overall heritable risk for AGA. To some degree, the polygenic architecture of AGA might reflect the complexity of the biological pathways involved. Further analyses and strategies that complement conventional genome-wide association studies are needed to identify these factors. These may include pathway-based analyses, the analysis of functional candidate genes and tests for epistatic effects with known loci.


Subject(s)
Alopecia/genetics , Multifactorial Inheritance/genetics , Polymorphism, Single Nucleotide/genetics , Adult , Aged , Case-Control Studies , Genetic Predisposition to Disease/genetics , Genome-Wide Association Study , Humans , Male , Middle Aged
5.
Hautarzt ; 63(10): 762-5, 2012 Oct.
Article in German | MEDLINE | ID: mdl-23052100

ABSTRACT

A 43-year-old man presented with white to skin-colored shiny papules on the face and neck. In addition, he had a positive family history and reported on multiple pneumothoraces. Histopathological examination revealed a papular mucinosis. Considering these findings, we made the diagnosis of Birt-Hogg-Dubé syndrome (BHDS) that was confirmed by molecular genetic analysis. This autosomal dominantly inherited tumor disorder is caused by germline mutations in the folliculin (FLCN) gene that encodes for the eponymous protein folliculin. Clinically, BHDS is predominantly characterized by the occurrence of fibrofolliculomas and trichodiscomas. A papular mucinosis, as encountered in our patient, has been described only once previously. Besides the cutaneous symptoms the disease can be associated with lung cysts and pneumothoraces as well as the development of benign and malignant kidney tumors. Following confirmation of BHDS on the DNA level, all patients with multiple cutaneous fibrofolliculomas should be treated in an interdisciplinary setting and undergo regular prophylactic screening examinations due to the association with renal cell carcinomas.


Subject(s)
Birt-Hogg-Dube Syndrome/diagnosis , Birt-Hogg-Dube Syndrome/therapy , Facial Dermatoses/diagnosis , Facial Dermatoses/therapy , Pneumothorax/diagnosis , Pneumothorax/therapy , Adult , Diagnosis, Differential , Humans , Male , Treatment Outcome
6.
Hautarzt ; 63(10): 756-9, 2012 Oct.
Article in German | MEDLINE | ID: mdl-23008007

ABSTRACT

While being treated with azathioprine and dexamethasone, a 21-year old man with myasthenia gravis suddenly developed rapidly progressing brown macules, predominantly on the trunk, palms and soles. We made a diagnosis of eruptive melanocytic nevi (EMN). This rare entity can appear after blistering skin diseases, in immunocompromised patients, and, in particular, during immunosuppressive therapy for autoimmune diseases. Since therapeutic regimens including azathioprine have been frequently reported in association with EMN, we recommended to our patient a treatment switch to mycophenolic acid to prevent the development of more nevi.


Subject(s)
Azathioprine/adverse effects , Drug Eruptions/diagnosis , Myasthenia Gravis/complications , Myasthenia Gravis/drug therapy , Nevus, Pigmented/chemically induced , Skin Neoplasms/chemically induced , Azathioprine/therapeutic use , Drug Eruptions/etiology , Drug Eruptions/prevention & control , Humans , Immunosuppressive Agents/adverse effects , Immunosuppressive Agents/therapeutic use , Male , Nevus, Pigmented/diagnosis , Nevus, Pigmented/prevention & control , Skin Neoplasms/diagnosis , Skin Neoplasms/prevention & control , Treatment Outcome , Young Adult
7.
Br J Dermatol ; 167(6): 1360-5, 2012 Dec.
Article in English | MEDLINE | ID: mdl-22897480

ABSTRACT

BACKGROUND: Alopecia areata (AA) is the second most common cause of hair loss in humans, and has a genetically complex inheritance. The hypothesis that AA is autoimmune in nature is supported by previous studies. These report an association with specific HLA alleles, as well as genetic variants of other genes implicated in autoimmunity, such as various cytokine genes. However, these cannot yet be considered proven susceptibility loci, as many of these association findings were derived from small patient samples. OBJECTIVES: To investigate the association between AA and selected cytokine genes using a sample of 768 patients with AA and 658 controls of Central European origin. METHODS: Eleven single-nucleotide polymorphisms (SNPs) from cytokine genes implicated in previous AA studies were genotyped. These genes were IL1B, IL1A, IL1RN, MIF, IFNG and the TNF/LTA gene region. We also genotyped 15 SNPs selected from cytokine genes that have shown significant association with other autoimmune diseases. These genes were IL10, IL36RN, IL12B, IL6, IL2, IL23, IL2RA and IL4R. RESULTS: Significant association was found for two variants within both IL2RA and TNF/LTA. In the overall sample, the most significant results were obtained for the IL2RA variant rs706778 (P = 0·00038) and the TNF/LTA locus variant rs1800629 (P = 0·0017). In subgroup analyses, according to severity, age at onset and family history these effects were stronger in the severely affected patients, with the lowest P-values being obtained for rs706778 (P = 3·8 × 10(-6) ). CONCLUSIONS: Our results point to the involvement of IL2RA and the TNF/LTA region in the aetiology of AA, in particular severe AA, and provide further support for the hypothesis that AA is autoimmune in nature.


Subject(s)
Alopecia Areata/genetics , Interleukin-2 Receptor alpha Subunit/genetics , Lymphotoxin-alpha/genetics , Polymorphism, Single Nucleotide , Tumor Necrosis Factor-alpha/genetics , Adolescent , Adult , Aged , Aged, 80 and over , Case-Control Studies , Child , Child, Preschool , Female , Genetic Loci , Genetic Predisposition to Disease , Genotyping Techniques , Humans , Male , Middle Aged , Risk Factors , Severity of Illness Index , White People , Young Adult
8.
Br J Dermatol ; 167(4): 901-13, 2012 Oct.
Article in English | MEDLINE | ID: mdl-22816431

ABSTRACT

BACKGROUND: Congenital erythropoietic porphyria (CEP) is an autosomal recessive cutaneous porphyria caused by decreased activity of uroporphyrinogen III synthase (UROS). Its predominant characteristics include bullous cutaneous photosensitivity to visible light from early infancy, progressive photomutilation and chronic haemolytic anaemia. Due to its rarity and genetic heterogeneity, clinical phenotypes are unclear and its impact on health-related quality of life (HRQoL) has not been previously assessed. OBJECTIVES: To define comprehensively CEP phenotypes and assess their impact on HRQoL, and to correlate these factors with laboratory parameters. METHODS: A single observer assessed patients with CEP from four European countries. RESULTS: Twenty-seven unrelated patients with CEP, aged between 7.6 and 65 years, participated in the study. The patients came from the U.K. (17), France (4), Switzerland (4) and Germany (2). Additional data were obtained for two deceased patients. Newly characterized features of CEP include acute-onset cutaneous and noncutaneous symptoms immediately following sunlight exposure, and pink erythematous facial papules. There was a lack of consistent genotype-phenotype correlation in CEP. The main poor prognostic factors in CEP are the early age of disease onset and haematological complications. CONCLUSIONS: CEP is a multisystem disease; cutaneous, ocular, oral and skeletal manifestations also contribute to disease severity and impact on HRQoL, in addition to the haematological complications. The rarity of the disease can lead to delayed diagnosis. The lack of consistent genotype-phenotype correlation in CEP suggests a contribution to phenotype from other factors, such as environment, patients' photoprotective behaviour and genes other than UROS. There is currently an unmet need for multidisciplinary management of patients with CEP.


Subject(s)
Porphyria, Erythropoietic/genetics , Uroporphyrinogen III Synthetase/genetics , Adolescent , Adult , Child , Cohort Studies , Europe , Female , Genetic Association Studies , Humans , Male , Middle Aged , Porphyria, Erythropoietic/physiopathology , Quality of Life , Young Adult
9.
Br J Dermatol ; 167(4): 888-900, 2012 Oct.
Article in English | MEDLINE | ID: mdl-22804244

ABSTRACT

BACKGROUND: Congenital erythropoietic porphyria (CEP) is an autosomal recessive photomutilating porphyria with onset usually in childhood, where haematological complications determine prognosis. Due to its extreme rarity and clinical heterogeneity, management decisions in CEP are often difficult. OBJECTIVES: To develop a management algorithm for patients with CEP based on data from carefully characterized historical cases. METHODS: A single investigator collated data related to treatments and their outcomes in 29 patients with CEP from the U.K., France, Germany and Switzerland. RESULTS: Six children were treated with bone marrow transplantation (BMT); five have remained symptomatically cured up to 11.5 years post-transplantation. Treatments such as oral charcoal, splenectomy and chronic hypertransfusion were either of no benefit or were associated with complications and negative impact on health-related quality of life. Lack of consistent genotype-phenotype correlation meant that this could not be used to predict disease prognosis. The main poor prognostic factors were early age of disease onset and severity of haematological manifestations. CONCLUSIONS: A management algorithm is proposed where every patient, irrespective of disease severity at presentation, should receive a comprehensive, multidisciplinary clinical assessment and should then be reviewed at intervals based on their predicted prognosis, and the rate of onset of complications. A BMT should be considered in those with progressive, symptomatic haemolytic anaemia and/or thrombocytopenia. Uroporphyrinogen III synthase genotypes associated with poor prognosis would additionally justify consideration for a BMT. Rigorous photoprotection of the skin and eyes from visible light is essential in all patients.


Subject(s)
Porphyria, Erythropoietic/therapy , Severity of Illness Index , Adolescent , Adult , Algorithms , Blood Transfusion/methods , Bone Marrow Transplantation/methods , Charcoal/administration & dosage , Child , Child, Preschool , Cohort Studies , Europe , Female , Humans , Infant , Male , Middle Aged , Porphyria, Erythropoietic/genetics , Protective Clothing , Splenectomy/methods , Young Adult , beta Carotene/administration & dosage
10.
Hautarzt ; 63(4): 278-82, 2012 Apr.
Article in German | MEDLINE | ID: mdl-22430612

ABSTRACT

A 35-year-old man presented with swelling, indurations and nodules on the thumb, wrist and fingers of the right hand. History revealed that the findings were slowly progressive and had been present for at least eight years. Histopathologic analysis of a nodule showed a diffuse infiltrate with atypical spindle-shaped cells and expression of cytokeratin, epithelial membrane antigen (EMA) and CD34; the diagnosis of epithelioid sarcoma (ES) was made. Because of diffuse extension of the tumor, forearm amputation was performed along with axillary dissection and local radiotherapy because of axillary lymph node metastases. ES is a rare subtype of soft tissue sarcoma with a harmless appearance and indolent course over years. ES represents a diagnostic challenge, with consequent delay in diagnosis and adequate treatment. The most important measure in the treatment of ES is early surgical excision with adjuvant radiotherapy if local metastases are present.


Subject(s)
Amputation, Surgical , Hand/pathology , Radiotherapy, Adjuvant , Sarcoma/pathology , Sarcoma/surgery , Adult , Humans , Male , Treatment Outcome
11.
Hautarzt ; 63(4): 276-8, 2012 Apr.
Article in German | MEDLINE | ID: mdl-22456612

ABSTRACT

The occurrence of multiple cutaneous leiomyomas can be indicative of hereditary cutaneous leiomyomatosis. This autosomal dominant disorder is due to germline mutations in the fumarate hydratase (FH) gene. Associations with uterine myomas and renal cell carcinomas have been described and are referred to as Multiple Cutaneous and Uterine Leiomyomas (MCUL) or Hereditary Leiomyomatosis and Renal Cell Cancer (HLRCC), respectively. A 34-year-old man presented with multiple red-brown papules and nodules. After histopathologic confirmation of piloleiomyomas, we made the diagnosis of hereditary cutaneous leiomyomatosis. Taking into consideration the aforementioned complications, close interdisciplinary management of these patients and regular screening examinations within affected families are mandatory.


Subject(s)
Kidney Neoplasms/congenital , Kidney Neoplasms/pathology , Leiomyomatosis/congenital , Leiomyomatosis/pathology , Neoplastic Syndromes, Hereditary/congenital , Neoplastic Syndromes, Hereditary/pathology , Skin Neoplasms/congenital , Skin Neoplasms/pathology , Adult , Diagnosis, Differential , Humans , Male , Syndrome , Uterine Neoplasms
12.
Br J Dermatol ; 165(6): 1293-302, 2011 Dec.
Article in English | MEDLINE | ID: mdl-22032556

ABSTRACT

BACKGROUND: Male-pattern baldness (androgenetic alopecia, AGA) is the most common form of hair loss among humans. Research has shown that it is caused by genetic factors. Numerous studies have unequivocally identified two major genetic risk loci for AGA: the X-chromosomal AR/EDA2R locus, and the PAX1/FOXA2 locus on chromosome 20. OBJECTIVES: To identify further candidate genes for AGA, and thus gain further insights into this phenotype. METHODS: A German sample of 581 severely affected cases and 617 controls was used to perform a genome-wide association study. The identified associated locus was further analysed by fine-mapping, and then independently replicated in an Australian sample. Expression and pathway analyses were performed to characterize the susceptibility gene identified. RESULTS: The most significant association signal was obtained for rs756853 (P = 1·64 × 10(-7) ), which is located intronically in the histone deacetylase 9 (HDAC9) gene. Fine-mapping and a family-based analysis revealed that rs756853 and the 6-kb distal rs2249817 were the most highly associated single nucleotide polymorphisms. The association finding was replicated in an independent Australian sample, when the analysis was restricted to severely affected cases and unaffected controls (P = 0·026). Analysis of rs2249817 in a combined sample of severely affected German and Australian cases and unaffected controls revealed a strong association signal (P = 9·09 × 10(-8) ). Tissue expression studies demonstrated HDAC9 expression in various tissues, including tissues of relevance to AGA. No strong genotypic effects were observed in genotype-specific expression or splice studies. Pathway analyses supported the hypothesis that HDAC9 plays a functional role in AGA via interaction with the AR gene. CONCLUSIONS: The present study suggests that HDAC9 is the third AGA susceptibility gene.


Subject(s)
Alopecia/genetics , Chromosomes, Human, Pair 7/genetics , Histone Deacetylases/genetics , Polymorphism, Single Nucleotide/genetics , Repressor Proteins/genetics , Adult , Alternative Splicing/genetics , Case-Control Studies , Genetic Predisposition to Disease/genetics , Genome-Wide Association Study , Genotype , Humans , Male
13.
Hautarzt ; 62(11): 842-51, 2011 Nov.
Article in German | MEDLINE | ID: mdl-21971768

ABSTRACT

Galli-Galli disease, a rare genodermatosis belonging to the spectrum of reticulate pigment dermatoses, is classified as an acantholytic variant of Dowling-Degos disease on the basis of its characteristic clinical and histological findings. In the context of this case series, Galli-Galli disease is characterized in detail based on the clinical and histopathological evaluation of 18 patients. The disease pattern is discussed in view of the current literature. In addition, a classification into two clinical subtypes is made and a genotype/phenotype correlation with mutations in the keratin 5 (KRT5) gene is established.


Subject(s)
Acantholysis/genetics , Acantholysis/pathology , Genetic Predisposition to Disease/genetics , Keratin-5/genetics , Polymorphism, Single Nucleotide/genetics , Skin/pathology , Adult , Aged , Female , Humans , Male , Middle Aged
14.
Hautarzt ; 62(10): 722-5, 2011 Oct.
Article in German | MEDLINE | ID: mdl-21915731

ABSTRACT

POEMS syndrome is a rare paraneoplastic syndrome due to a plasma cell dyscrasia, which includes peripheral neuropathy, organomegaly, endocrinopathy, monoclonal plasma cell proliferation and skin changes. Elevated levels of VEGF (vascular endothelial growth factor) in the serum of patients are suggested to play a pivotal role in the pathophysiology. A 60-year-old male presented with POEMS syndrome and painful edema, skin thickening of the distal extremities and livid-erythematous discoloration. The sclerotic changes resulted in a severe limitation of joint flexibility. Furthermore, the patient showed clubbing, white nails and a facial lipoatrophy. In addition to the skin changes, the patient was diagnosed with polyneuropathy, monoclonal gammopathy (type lambda), high elevated VEGF-levels, hepatomegaly, lymphadenopathy, hypothyreosis, hypogonadism and thrombocytosis in the course of POEMS syndrome. Treatment with 4 cycles of bortezomib and dexamethasone resulted in improvement of symptoms.


Subject(s)
Cooperative Behavior , Interdisciplinary Communication , POEMS Syndrome/diagnosis , Antineoplastic Agents/therapeutic use , Antineoplastic Agents, Hormonal/therapeutic use , Boronic Acids/therapeutic use , Bortezomib , Dexamethasone/therapeutic use , Drug Therapy, Combination , Humans , Immunoglobulin lambda-Chains/blood , Male , Middle Aged , POEMS Syndrome/drug therapy , Paraproteinemias/blood , Paraproteinemias/diagnosis , Pyrazines/therapeutic use , Vascular Endothelial Growth Factor A/blood
15.
Hautarzt ; 62(4): 255-7, 2011 Apr.
Article in German | MEDLINE | ID: mdl-21424890

ABSTRACT

Scleredema adultorum is characterized by induration of the skin on the neck, shoulders and upper back caused by increased accumulation of collagen and aminoglycans in the dermis. The induration may progress and lead to pronounced restriction of mobility. Scleredema diabeticorum is one type of scleredema adultorum associated with diabetes mellitus. Multiple therapies have been tried, but most of them have not proven to be consistently effective. We report two cases of scleredema diabeticorum treated successfully with UVA-1- as well as physiotherapy and topical corticosteroids; this approach led to improvement in skin changes and mobility.


Subject(s)
PUVA Therapy/methods , Photosensitizing Agents/therapeutic use , Humans , Male , Middle Aged , Scleredema Adultorum/drug therapy , Scleredema Adultorum/pathology , Treatment Outcome
16.
Hautarzt ; 61(4): 284-6, 2010 Apr.
Article in German | MEDLINE | ID: mdl-20300722

ABSTRACT

Galli-Galli disease is a rare genodermatosis which classically presents with reticulate hyperpigmentation of the flexures and intertriginous areas. Recently, an atypical clinical presentation of Galli-Galli disease with monomorphic lentigo-like maculae and papules has been reported. We describe two cases of Galli-Galli disease, one patient presenting with a classical form and another with atypical skin lesions. In spite of the clinical differences, the histopathological examination - with filiform elongated rete ridges and acantholysis - confirmed the diagnosis of Galli-Galli disease in both cases.


Subject(s)
Acantholysis/complications , Acantholysis/pathology , Hyperpigmentation/complications , Hyperpigmentation/pathology , Diagnosis, Differential , Female , Humans , Middle Aged
17.
Br J Dermatol ; 163(1): 197-200, 2010 Jul.
Article in English | MEDLINE | ID: mdl-20222933

ABSTRACT

BACKGROUND: Galli-Galli disease (GGD) is a rare genodermatosis. Its clinical presentation is identical to that of Dowling-Degos disease (DDD), but the presence of the histopathological feature of acantholysis in GGD is thought to distinguish the two disorders. Mutations in the keratin 5 gene (KRT5) have been identified in the majority of patients with DDD and in a small number of patients with GGD. OBJECTIVES: To provide further support for the hypothesis that GGD is merely a variant of DDD, and to examine whether acantholysis is genuinely rare in DDD or rather a common but under-reported histological feature of DDD. METHODS: We conducted the first systematic mutational investigation of patients with GGD and re-examined the histopathology of patients previously assigned a diagnosis of DDD. For the mutational investigation, KRT5 was sequenced in seven unrelated patients with clinically and histopathologically confirmed GGD. In addition, the histopathological findings of six patients with DDD were re-evaluated. RESULTS: The mutation c.418dupA was found in five patients with GGD. The typical histopathological features of GGD were identified in six patients who had previously been assigned a diagnosis of DDD. CONCLUSIONS: We found further evidence to suggest that GGD is indeed a variant of DDD and not a distinct disease entity. Two facts in particular support this conclusion: the same KRT5 mutation was found in patients with GGD and in patients with DDD, and acantholysis seems to be present in a large number of patients who had previously been assigned a diagnosis of DDD.


Subject(s)
Acantholysis/genetics , Hyperpigmentation/genetics , Keratin-5/genetics , Malignant Atrophic Papulosis/genetics , Acantholysis/pathology , Adolescent , Adult , Diagnosis, Differential , Female , Genetic Predisposition to Disease , Humans , Hyperpigmentation/pathology , Male , Malignant Atrophic Papulosis/pathology , Mutation , Pedigree , Young Adult
19.
Br J Dermatol ; 162(4): 866-9, 2010 Apr.
Article in English | MEDLINE | ID: mdl-20030635

ABSTRACT

BACKGROUND: Alopecia areata (AA) is a common hair loss disorder with a complex mode of inheritance. Autoimmune mechanisms are presumed to be crucial aetiologically. It is plausible that a number of autoimmune disorders may share a common genetic background. This phenomenon has been demonstrated in previous studies, which have shown an overlap of susceptibility alleles between AA and other autoimmune disorders. Recent studies have shown that genetic variants on the TRAF1/C5 (tumor necrosis factor receptor-associated factor 1, complement component 5) locus confer susceptibility to rheumatoid arthritis (RA). OBJECTIVES: To examine the role of the TRAF1/C5 locus in the development of AA using a large sample of 1,195 patients with AA and 1280 controls. METHODS: We genotyped the two most significant single nucleotide polymorphisms (SNPs) (rs10818488, rs2416808) from a former RA candidate gene study. After having obtained evidence for association, we performed a fine-mapping study and genotyped the locus with an additional 27 SNPs. RESULTS: While no significant result was obtained for the overall sample, rs2416808 showed significant associations in the analysis of the subgroups with severe AA and with a positive family history. The most significant P-value for rs2416808 was in familial cases (P = 0.004, P(corr) = 0.026). The fine mapping revealed significant associations for four additional SNPs in the analysis of subgroups, with rs2416808 remaining the most significant marker. CONCLUSIONS: Our results point to the involvement of the TRAF1/C5 locus in the aetiology of familial and severe AA, and provide further support for a shared aetiology between AA and other autoimmune disorders.


Subject(s)
Alopecia Areata/genetics , Complement C5/genetics , Polymorphism, Single Nucleotide/genetics , TNF Receptor-Associated Factor 1/genetics , Adolescent , Adult , Aged , Aged, 80 and over , Case-Control Studies , Child , Child, Preschool , Chromosome Mapping , Female , Genetic Markers/genetics , Genetic Predisposition to Disease , Humans , Male , Middle Aged , Pedigree , Risk Factors , Severity of Illness Index , Young Adult
20.
Hautarzt ; 60(10): 790-3, 2009 Oct.
Article in German | MEDLINE | ID: mdl-19756434

ABSTRACT

Three patients presented with typical porphyria cutanea tarda-like vesicles, erosions and scars as well as increased fragility, primarily on the back of the hands. In two of the three, porphyrin workup was normal. Skin biopsy was compatible with porphyria cutanea tarda (PCT) or pseudoporphyria. The common aspect in the patients' history was the frequent use of solaria for many years, so that UV-induced pseudoporphyria was diagnosed. Treatment was strict abstention from UV radiation and regular dermatologic controls for signs of skin damage. Porphyrin analysis in the third patient showed normal excretion of total urine porphyrins and precursors; however, fecal porphyrins were elevated with dominating coproporphyrins in HPLC and the plasma fluorescence scan yielded a peak at 625 nm. Subsequent mutation analysis showed a mutation in the protoporphyrinogen oxidase gene, thereby confirming the diagnosis of variegate porphyria. Five months after the initial diagnosis the patient presented with the first acute attack. Further investigations revealed a metastasized carcinoma of the colon, which probably triggered the acute attack. Our cases show rare differential diagnoses in patients presenting with typical PCT-like skin lesions. The discrimination between porphyria cutanea tarda and its differential diagnoses is very important since it has an important impact not only on the treatment modality but also on the course and the prognosis of the disease.


Subject(s)
Porphyria Cutanea Tarda/complications , Porphyria Cutanea Tarda/diagnosis , Porphyria, Variegate/diagnosis , Porphyria, Variegate/etiology , Sunbathing , Ultraviolet Rays/adverse effects , Adult , Diagnosis, Differential , Female , Humans , Male , Middle Aged , Rare Diseases
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