Lennart Ocker-Serger

Dr. Lennart Ocker-Serger

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Research Focus & Metrics

Academic Career Length

5Years (2022-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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Journal Article
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Nessr Abu RachedNessr Abu Rached
Nessr Abu Rached
TGThilo Gambichler
Thilo Gambichler
Johannes W. DietrichJohannes W. Dietrich
Johannes W. Dietrich
LOLennart Ocker-Serger
Lennart Ocker-Serger
CSCaroline Seifert
Caroline Seifert
FBFalk G. Bechara
Falk G. Bechara
Hidradenitis suppurativa (HS) is a chronic inflammatory disease manifesting in inverse body regions. In a systematic review, the role of hormones in HS will be presented to better understand the pathomechanisms of HS. The review is based on the PRISMA criteria. Systematic research was carried out using keywords. Subsequently, the data were analyzed based on the clinical response and other relevant information. The main focus of our systematic review was on HS manifestation, exacerbation, sex hormones, antiandrogen therapy, thyroid function, polycystic ovary syndrome, insulin resistance, and adipokines. In HS, there appears to be a dysregulated adipokine release that is shifted towards pro-inflammatory adipokines. Insulin resistance is significantly more common in HS than in healthy patients regardless of BMI, age, and gender. Insulin resistance in HS patients leads to further cardiovascular disease. The mechanism of insulin resistance and role of adipokines should be investigated in future studies to better provide the pathomechanisms of HS. The role of androgens seems to be important in a certain subgroup of female patients. Anti-androgenic therapy can be useful and helpful in some patients. However, further studies are needed to better understand the hormonal relationship in HS.

6 December 2022 in Journal of Clinical Medicine
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Journal Article
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LOLennart Ocker-Serger
Lennart Ocker-Serger
Nessr Abu RachedNessr Abu Rached
Nessr Abu Rached
CSCaroline Seifert
Caroline Seifert
CSChristina Scheel
Christina Scheel
FBFalk G. Bechara
Falk G. Bechara
Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease presenting with recurrent inflammatory lesions in intertriginous body regions. HS has a pronounced impact on patients’ quality of life and is associated with a variety of comorbidities. Treatment of HS is often complex, requiring an individual approach with medical and surgical treatments available. However, especially in moderate-to-severe HS, there is an urgent need for new treatment approaches. In recent years, increased research has led to the identification of new potential therapeutic targets. This review aims to give a comprehensive and practical overview of current treatment options for HS. Furthermore, the clinically most advanced novel treatment approaches will be discussed.

Verified
Journal Article
Open access
PDF file
Nessr Abu RachedNessr Abu Rached
Nessr Abu Rached
TGThilo Gambichler
Thilo Gambichler
LOLennart Ocker-Serger
Lennart Ocker-Serger
Johannes W. DietrichJohannes W. Dietrich
Johannes W. Dietrich
DQDaniel Quast
Daniel Quast
FBFalk G. Bechara
Falk G. Bechara
Hidradenitis suppurativa (HS) is a chronic skin disease that is often associated with metabolic disorders. Diabetes mellitus (DM) is a frequent comorbidity in HS. There is currently no established screening for DM in HS patients. The aim of our study was to identify high-risk groups of HS patients that develop DM and to assess the frequency of different types of DM present in HS patients. To do so, we conducted a monocentric study in 99 patients with HS. All patients underwent detailed clinical and laboratory assessments, including the determination of glycated hemoglobin. Among the 20.2% of patients that presented with DM, type 2 was by far the most prevalent (19 out of 20 patients). Moreover, male gender, age, BMI, Hurley stage, modified Hidradenitis Suppurativa Score (mHSS), DLQI and hypertension all correlated with the glycated hemoglobin levels in the HS patients. In the multivariable analysis, Hurley stage III, older age, and higher BMI were significantly associated with DM. Specifically, patients at Hurley stage III were at a 5.3-fold increased risk of having DM type II compared to patients at earlier Hurley stages. Since many of the HS patients had not been diagnosed, our study reveals shortcomings in the screening for DM and suggest that this should be routinely performed in HS patients at high risk to avoid secondary complications.

21 March 2025 in Journal of Clinical Medicine
Verified
Journal Article
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Nessr Abu RachedNessr Abu Rached
Nessr Abu Rached
Johannes W. DietrichJohannes W. Dietrich
Johannes W. Dietrich
LOLennart Ocker-Serger
Lennart Ocker-Serger
ESEggert Stockfleth
Eggert Stockfleth
YHYannik Haven
Yannik Haven
FBFalk G. Bechara
Falk G. Bechara
Background: Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease often associated with metabolic disorders such as diabetes mellitus. Recent research suggests a link between systemic inflammation and insulin–glucose dysregulation in HS. This study investigates the relationship between insulin–glucose homeostasis, diabetes mellitus and the haptoglobin concentration in HS patients. Methods: We assessed 95 HS patients and 49 controls using validated fasting-based function tests, including the Structural Parameter Inference Approach (SPINA), Homeostasis Model Assessment (HOMA) and Quantitative Insulin Sensitivity Check Index (QUICKI). Results: The HS patients had a significantly higher fasting insulin concentration (97.2 vs. 69.0 pmol/L, p = 0.035), increased insulin resistance (HOMA-IR: 3.47 vs. 2.57, p = 0.016) and impaired insulin sensitivity (SPINA-GR: 1.34 vs. 1.76 mol/s, p = 0.017). In diabetes, the insulin sensitivity was more strongly reduced (SPINA-GR: 0.61 vs. 1.41 mol/s, p = 0.0057) and the insulin resistance increased (HOMA-IR: 7.3 vs. 3.2, p = 0.017). Higher haptoglobin concentrations were accompanied by worse glycaemic control, demonstrating a significantly elevated fasting glucose (5.77 vs. 5.11 mmol/L, p = 0.043) concentration and HbA1c (5.7% vs. 5.4%, p = 0.0081) fraction. Conclusions: Our findings suggest that chronic inflammation in HS contributes to metabolic dysregulation, worsening insulin resistance and glycaemic control, particularly in those with elevated haptoglobin or diabetes.

4 December 2023 in Journal of Clinical Medicine
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Journal Article
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Nessr Abu RachedNessr Abu Rached
Nessr Abu Rached
Johannes W. DietrichJohannes W. Dietrich
Johannes W. Dietrich
LOLennart Ocker-Serger
Lennart Ocker-Serger
DQDaniel Quast
Daniel Quast
CSChristina Scheel
Christina Scheel
FBFalk G. Bechara
Falk G. Bechara
Hidradenitis suppurativa (HS) is a chronic skin disease that can have an association with endocrine disorders. There is conflicting information in the literature regarding the role of the thyroid gland in HS. This study aimed to close this knowledge gap and investigate how thyroid disease is involved in patients with HS. We carried out a case–control study with a total of 160 patients, of whom 108 were patients with HS and 52 were controls matched for age and sex. Parametric and non-parametric methods were used to analyze the results. We calculated structural parameters of thyroid homeostasis to detect subclinical thyroid disease, non-thyroid disease syndrome and other forms. The severity of HS was not associated with thyroid hormone levels and antibodies (p > 0.05). HS patients with or without hypothyroidism had decreased FT4 levels and a decreased thyroid secretory capacity (SPINA-GT). Titers of TSH receptor autoantibodies (TRAb) were significantly higher in smoking HS patients compared to non-smokers (median: 1.18 vs. 1.08; p = 0.042). The rate of subclinical hypothyroidism was significantly higher in HS patients; thus, subclinical hypothyroidism is an important comorbidity of HS (p < 0.05). Further studies are needed to investigate whether the chronic inflammation of HS is a cause of increased rates of (subclinical) hypothyroidism.

19 February 2025 in Cancers
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Journal Article
Open access
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Nessr Abu RachedNessr Abu Rached
Nessr Abu Rached
RKRiina Käpynen
Riina Käpynen
MDMartin Doerler
Martin Doerler
LOLennart Ocker-Serger
Lennart Ocker-Serger
CFCarolin Frost
Carolin Frost
FBFalk G. Bechara
Falk G. Bechara
Introduction: Hidradenitis suppurativa (HS) is a chronic inflammatory skin disease associated with significant morbidity. Although cutaneous squamous cell carcinoma (cSCC) is a rare complication, it has serious consequences, particularly when associated with high-risk human papillomavirus (HPV) infections. This study examines two cases of HPV-16-induced cSCC in patients with long-standing HS and explores the potential role of HPV vaccination in preventing such malignancies. Methods and results: We report on two male patients with severe HS (Hurley stage III) and cutaneous squamous cell carcinoma with positive detection of HPV DNA in the tumour tissue. Conclusions: HPV vaccination may offer a preventive approach to cSCC in HS patients by reducing high-risk HPV infections. Incorporating vaccination into the management of HS, particularly in high-risk individuals, could potentially reduce the incidence of malignant transformation and improve long-term outcomes. Further research is warranted to validate these findings and refine prevention strategies.