Global consensus process to establish a core dataset for hidradenitis suppurativa registries

BACKGROUND

Several registries for hidradenitis suppurativa (HS) already exist in Europe and the USA. There is currently no global consensus on a core dataset (CDS) for these registries. Creating a global HS registry is challenging, owing to logistical and regulatory constraints, which could limit opportunities for global collaboration as a result of differences in the dataset collected. The solution is to encourage all HS registries to collect the same CDS of information, allowing registries to collaborate.

OBJECTIVES

To establish a core set of items to be collected by all HS registries globally. The core set will cover demographic details, comorbidities, clinical examination findings, patient-reported outcome measures and treatments.

METHODS

Beginning in September 2022, 20 participants - including both clinicians with expertise in HS and patient advocates - from eight countries across three continents participated in a Delphi process consisting of four rounds of voting, with all participants completing each round. A list of potential items for inclusion in the core set was generated from the relevant published literature, including systematic reviews of comorbidities in HS, clinical and examination findings, and epidemiology. For disease severity and progression items, the Hidradenitis SuppuraTiva Core outcome set International Collaboration (HiSTORIC) core set and other relevant instruments were considered for inclusion. This resulted in 47 initial items. Participants were invited to suggest additional items to include during the first round. Anonymous feedback was provided to inform each subsequent round of voting to encourage consensus.

RESULTS

The eDelphi process established a CDS of 48 items recommended for inclusion in all HS registries globally.

CONCLUSIONS

The routine adoption of this CDS in current and future HS registries should allow registries in different parts of the world to collaborate, enabling research requiring large numbers of participants.

Access to dermatologic care and provider impact on hidradenitis suppurativa care: global survey insights

Background

Hidradenitis suppurativa (HS) is an understudied disease, and current HS studies have focused on participants already connected to dermatologic care.

Objective

We surveyed participants in online HS support communities to gain a comprehensive understanding of how provider type impacts HS disease management and the issues individuals with HS face when accessing care.

Methods

From June 13 to June 30, 2021, we administered an anonymous cross-sectional online survey to HS Facebook support group participants who had a self-confirmed diagnosis of HS. Survey items assessed respondent demographics, primary HS provider, and barriers to HS care and pain management. Descriptive analyses are presented.

Results

The survey was viewed 5,168 times and 1,040 surveys met eligibility criteria (20.1%). Survey participants were 97% female and 72% White. Seventy-two percentage resided in the United States and 22% in Europe. Forty-seven percentage reported having a dermatologist as their primary HS provider, 38% reported a nondermatologist, and 15% reported no HS provider. We found that Asian race, full-time employment, private health insurance, and urban setting were each associated with higher rates of having a dermatologist as a primary HS provider. However, 43.7% of those with a dermatologist reported biologic use, as compared with 14.5% with nondermatologist HS providers. Our cohort was notably more severely impacted by comorbid diseases; 55.9% of our cohort had anxiety, 53.6% had depression, and 50.7% had obesity. Overall, 74.2% of our cohort reported experiencing stigma while accessing care for their HS.

Limitations

Participant recruitment via social media platform facilitates recruitment of individuals across the spectrum of healthcare access, but may introduce selection bias and favor well-resourced areas. Self-reported data may be subject to recall bias.

Conclusion

Our study provides unique insights into the characteristics and experiences of individuals with HS across the spectrum of health care access.

The Global Hidradenitis Suppurativa Atlas (GHiSA) Methodology: Combining Global Proportions in a Pooled Analysis

INTRODUCTION

Data concerning the global burden of Hidradenitis Suppurativa (HS) are limited. Reported prevalence estimates vary between 0.0003% and 4.1%, and data from various geographical regions are still to be collected. Previously reported prevalence rates have been limited by the methodological approach and source of data. This has resulted in great heterogeneity as prevalence data from physician-diagnosed cases poorly match those of self-reported apparent HS disease.

METHODS

The Global Hidradenitis Suppurativa Atlas (GHiSA) introduces an innovative approach to determine the global prevalence of HS. This approach involves using a previously validated questionnaire to screen apparently healthy adults accompanying a patient to a non-dermatological outpatient clinic visit in a hospital. The screening questionnaire (i.e., the index test) is combined with a subsequent physician-based in-person validation (i.e., the reference standard) of the participants who screen positive. Ten percent of the screen-negative participants are also clinically assessed to verify the diagnostic precision of the test. The local prevalence (pi) will be estimated from each country that submits the number of patients who are HS positive according to the index test and clinical examination (n), and the corresponding total number of observations (N).

CONCLUSION

The GHiSA Global Prevalence studies are currently running simultaneously in 58 countries across six continents (Africa, Europe, Australia, North America, South America, and Asia). The goal of the combined global proportion is the generation of a single summary (i.e., proportional meta-analysis), which will be done after a logit transformation, and synthesized using a random-effects model. The novel standardization of the Global Prevalence studies conducted through GHiSA enables direct international comparisons, which were previously not possible due to substantial heterogeneity in past HS prevalence studies.

Tertiary lymphoid structures sustain cutaneous B cell activity in hidradenitis suppurativa

Hidradenitis suppurativa (HS) is a chronic skin condition affecting approximately 1% of the US population. HS skin lesions are highly inflammatory and characterized by a large immune infiltrate. While B cells and plasma cells comprise a major component of this immune milieu, the biology and the contribution of these cells in HS pathogenesis are unclear. We aimed to investigate the dynamics and microenvironmental interactions of B cells within cutaneous HS lesions. Combining histological analysis, single-cell RNA sequencing, and spatial transcriptomics profiling of HS lesions, we defined the tissue microenvironment relative to B cell activity within this disease. Our findings identified tertiary lymphoid structures (TLSs) within HS lesions and described organized interactions among T cells, B cells, antigen-presenting cells, and skin stroma. We found evidence that B cells within HS TLSs actively underwent maturation, including participation in germinal center reactions and class switch recombination. Moreover, skin stroma and accumulating T cells were primed to support the formation of TLSs and facilitate B cell recruitment during HS. Our data definitively demonstrated the presence of TLSs in lesional HS skin and point to ongoing cutaneous B cell maturation through class switch recombination and affinity maturation during disease progression in this inflamed nonlymphoid tissue.

Longitudinal remote monitoring of hidradenitis suppurativa: a pilot study

We sought to investigate the feasibility of longitudinal monitoring of disease activity from home in people with hidradenitis suppurativa (HS). Over 6 months, our novel digital tool collected 421 photos of HS-affected skin from 27 participants and captured trends in pain and quality of life scores. We found that participants with mild disease were more likely to share their progress than those with more severe disease, which is favourable as it may suggest a role for remote monitoring in tracking disease progression. This pilot provides proof of concept that will support future studies.

Outcome Measures for the Evaluation of Treatment Response in Hidradenitis Suppurativa for Clinical Practice: A HiSTORIC Consensus Statement

Importance

Although several clinician- and patient-reported outcome measures have been developed for trials in hidradenitis suppurativa (HS), there is currently no consensus on which measures are best suited for use in clinical practice. Identifying validated and feasible measures applicable to the practice setting has the potential to optimize treatment strategies and generate generalizable evidence that may inform treatment guidelines.

Objective

To establish consensus on a core set of clinician- and patient-reported outcome measures recommended for use in clinical practice and to establish the appropriate interval within which these measures should be applied.

Evidence Review

Clinician- and patient-reported HS measures and studies describing their psychometric properties were identified through literature reviews. Identified measures comprised an item reduction survey and subsequent electronic Delphi (e-Delphi) consensus rounds. In each consensus round, a summary of outcome measure components and scoring methods was provided to participants. Experts were provided with feasibility characteristics of clinician measures to aid selection. Consensus was achieved if at least 67% of respondents agreed with use of a measure in clinical practice.

Findings

Among HS experts, response rates for item reduction, e-Delphi round 1, and e-Delphi round 2 surveys were 76.4% (42 of 55), 90.5% (38 of 42), and 92.9% (39 of 42), respectively; among patient research partners (PRPs), response rates were 70.8% (17 of 24), 100% (17 of 17), and 82.4% (14 of 17), respectively. The majority of experts across rounds were practicing dermatologists with 18 to 19 years of clinical experience. In the final e-Delphi round, most PRPs were female (12 [85.7%] vs 2 males [11.8%]) and aged 30 to 49 years. In the final e-Delphi round, HS experts and PRPs agreed with the use of the HS Investigator Global Assessment (28 [71.8%]) and HS Quality of Life score (13 [92.9%]), respectively. The most expert-preferred assessment interval in which to apply these measures was 3 months (27 [69.2%]).

Conclusions and Relevance

An international group of HS experts and PRPs achieved consensus on a core set of HS measures suitable for use in clinical practice. Consistent use of these measures may lead to more accurate assessments of HS disease activity and life outcomes, facilitating shared treatment decision-making in the practice setting.

Patient-reported influences on COVID-19 vaccine acceptance and hesitancy in people with hidradenitis suppurativa

COVID-19 continues to pose a risk to patients with hidradenitis suppurativa (HS) due to the high prevalence of comorbidities associated with severe COVID-19 disease. We aimed to characterize perspectives on COVID-19 vaccination among patients with HS. International respondents from 20 online HS support groups were recruited to complete a voluntary, anonymous, online cross-sectional survey from 25 October to 21 November 2021 to obtain perspectives from people with HS who may and may not access healthcare. We report higher rates of COVID-19 vaccine hesitancy among patients with HS who expressed dissatisfaction with their dermatological care.

Patient Perspectives of Health System Barriers to Accessing Care for Hidradenitis Suppurativa: A Qualitative Study

Importance

Patient-perceived barriers to hidradenitis suppurativa (HS) care are poorly understood. Understanding health care barriers is a critical first step toward improving care for this population.

Objective

To characterize the health care experiences of people living with HS, including perceived barriers and facilitators to health care access, and to elucidate potential associations among these barriers and facilitators, health care access, and disease activity.

Design, Setting, and Participants

In this qualitative study, an inductive thematic analysis was conducted on 45 in-depth, 60- to 90-minute semistructured interviews of 45 people with HS from diverse sociodemographic backgrounds that took place between March and April 2020. Individuals were eligible if they could speak English, were 18 years or older, and were diagnosed with HS. A diagnosis of HS was confirmed through physician diagnosis or through self-reported, affirmative response to the validated screening question, "Do you experience boils in your armpits or groin that recur at least every six months?"

Main Outcomes and Measures

Interviews were audio recorded and transcribed verbatim. A modified grounded theory approach was used to develop the codebook, which investigators used for inductive thematic analysis.

Results

Among the 45 participants included, the median (IQR) age was 37 (16) years, 33 (73%) were female, and 22 (49%) were White. There were 6 interrelated themes associated with participant-perceived barriers to accessing HS care: (1) bidirectional associations of disease activity and employment, (2) association of employment with health care coverage, (3) association of health care coverage with costs and perceived access to care, (4) association of costs with access to patient-centered care, (5) health care professional attitudes and knowledge influence patient-centered care and perceived access to care and disease activity, and (6) health system characteristics influence patient-centered care and associated costs, perceived access to care, and disease activity.

Conclusions and Relevance

This qualitative study highlights themes that generate a conceptual model for understanding barriers that may act synergistically to limit health care access and influence disease activity. The disease activity of HS may be reduced when cycle elements are optimized. This study also highlights areas for future investigations and potential systems-level changes to improve access to patient-centered HS care.

Factors associated with disease-specific life impact in patients with hidradenitis suppurativa: results from the Global VOICE project

Patients with hidradenitis suppurativa experience significant life impact related to their disease. Younger age, Black race, high BMI, active smoking, flares, depression, anxiety, high comorbidity burden, disability, and difficult access to a dermatologist adversely influence life impact related to having hidradenitis suppurativa. Attention to these factors, particularly modifiable ones, may reduce overall impact of disease.

Tertiary Lymphoid Structures Sustain Cutaneous B cell Activity in Hidradenitis Suppurativa

Background

Hidradenitis suppurativa (HS) skin lesions are highly inflammatory and characterized by a large immune infiltrate. While B cells and plasma cells comprise a major component of this immune milieu the biology and contribution of these cells in HS pathogenesis is unclear.

Objective

We aimed to investigate the dynamics and microenvironmental interactions of B cells within cutaneous HS lesions.

Methods

We combined histological analysis, single-cell RNA-sequencing (scRNAseq), and spatial transcriptomic profiling of HS lesions to define the tissue microenvironment relative to B cell activity within this disease.

Results

Our findings identify tertiary lymphoid structures (TLS) within HS lesions and describe organized interactions between T cells, B cells, antigen presenting cells and skin stroma. We find evidence that B cells within HS TLS actively undergo maturation, including participation in germinal center reactions and class switch recombination. Moreover, skin stroma and accumulating T cells are primed to support the formation of TLS and facilitate B cell recruitment during HS.

Conclusion

Our data definitively demonstrate the presence of TLS in lesional HS skin and point to ongoing cutaneous B cell maturation through class switch recombination and affinity maturation during disease progression in this inflamed non-lymphoid tissue.

Real-World Findings on the Characteristics and Treatment Exposures of Patients with Hidradenitis Suppurativa from US Claims Data

INTRODUCTION

Hidradenitis suppurativa (HS) is a chronic, debilitating, and painful inflammatory skin disease that significantly and negatively impacts patients' quality of life. The prevalence of HS in the USA is estimated to be 0.10%, with worldwide reports suggesting a prevalence closer to 1%. There is limited real-world evidence available on the care of patients with HS. We aimed to evaluate the trends in clinical care and treatment in the patient population with HS in the USA in a real-world setting.

METHODS

A cohort study was conducted using claims data from IBM MarketScan Databases, including the US Commercial Claims and Encounters with Medicare Supplemental and Coordination of Benefits (CCAE+MDCR) database and IBM US Medicaid database.

RESULTS

The annual prevalence of HS increased from 0.06% (2008) to 0.14% (2017), and from 0.17% (2008) to 0.31% (2017) among CCAE+MDCR and Medicaid patients, respectively. Dermatologist visits increased from 31.9% (2008) to 47.8% (2019) in CCAE+MDCR patients, and decreased from 10.9% (2008) to 8.5% (2018) in Medicaid patients. Opioid use decreased from 45.4% (2008) to 25.5% (2019) among CCAE+MDCR patients, and from 71.3% (2008) to 48.1% (2018) among Medicaid patients. Only 8.4% of CCAE+MDCR patients and 5.8% of Medicaid patients were exposed to any biologic in 2018.

CONCLUSIONS

Improved care and treatment of HS over the last decade, including the emergence of new treatments, have been accompanied by an increase in awareness and reported prevalence of the disease. However, there are still gaps in access to dermatologic care and low utilization of biologic therapies among patients with HS. INFOGRAPHIC.

Evaluation of Hidradenitis Suppurativa Diagnostic Criteria in Pediatric Patients

Importance

Hidradenitis suppurativa (HS) is associated with considerable diagnostic delay. Although most patients report adolescent onset, existing HS diagnostic criteria may not adequately capture disease in pediatric populations.

Objectives

To determine the proportion of physician-diagnosed pediatric patients with HS who met diagnostic criteria, and describe demographics, disease characteristics, and diagnostic patterns among pediatric patients with HS.

Design, Setting, and Participants

In this retrospective, cross-sectional study, electronic medical records from 2 sites of a single academic tertiary care center were included. Eligible patients were those born after January 1, 1993, and assigned International Classification of Diseases, Ninth and Tenth Revisions (ICD-9/10) codes for HS (ICD-9 705.83/ICD-10 L73.2) between January 1, 2012, and July 1, 2021. Patients were excluded if they were older than 18 years at diagnosis, had inaccessible diagnostic visit notes, or were unintentionally assigned an HS ICD code.

Exposures

Pediatric patients with HS.

Main Outcomes and Measures

Fulfillment of diagnostic criteria in pediatric patients with HS.

Results

A total of 297 adolescents with HS were included in the study; 123 patients were female (78.1%), 78 self-identified as Black (26.3%), and 116 self-identified as Hispanic (39.1%). The median (IQR) age at diagnosis was 14.0 (13.0-16.0) years. Documentation from the diagnostic visit demonstrated that 127 (42.8%) patients did not meet all 3 major HS diagnostic criteria. Of these patients, 122 (96.1%) did not meet the recurrence interval criterion (≥2 lesions within 6 months). Overall, 96 patients who did not meet the recurrence interval criterion had documentation from additional visits in the health system; 59 (61.5%) had documentation of 1 or more additional lesions consistent with HS. Review of these additional records demonstrated that 26 of these 59 (44.1%) patients met the recurrence interval criterion after diagnosis, and 44 (74.6%) had recurrent lesions within a 1-year interval (median, 6.5 months; interquartile range, 3.5-12.2 months). Medical chart review was conducted from November 22, 2021, to January 12, 2022. Analysis was conducted from January 12, 2022, to January 15, 2022.

Conclusions and Relevance

Overall, 118 (40%) of 297 pediatric patients with HS in this retrospective cross-sectional study did not meet all major diagnostic criteria at the time of diagnosis, largely due to failure to fulfill the 6-month recurrence interval criterion. Future studies are needed to determine the appropriate recurrence interval to facilitate timely diagnosis and promote clinical trial eligibility for pediatric patients with HS.

Diagnosing and Managing Hidradenitis Suppurativa in Pediatrics

Hidradenitis suppurativa (HS) is a debilitating chronic inflammatory skin disease that presents as exquisitely tender abscesses, draining fistulae, and sinus tracts. HS can lead to significant impairments in patients' quality of life, especially for children and adolescents who face challenges related to self-esteem and physical and emotional development. Severe long-term physical sequelae of inadequately treated HS include extensive scarring, urogenital strictures, immobility, and squamous cell carcinoma; emotional sequelae include depression, anxiety, and suicidal ideation. Many of the devastating long-term sequelae associated with HS can be prevented with early recognition and proper collaborative management. This article reviews strategies to aid pediatricians in early diagnosis of HS and provides clinical pearls for management and prevention of disease flares. [Pediatr Ann. 2022;51(3):e123-e127.].

Medical Management of Hidradenitis Suppurativa with Non-Biologic Therapy: What's New?

Hidradenitis suppurativa (HS) is a severe chronic relapsing inflammatory disorder of the hair follicle unit that can cause painful abscesses, nodules, tunnels, and tracts in intertriginous parts of the body. The disease can often result in disfigurement and adversely impact patient quality of life. The management of HS has expanded significantly over the past decade to include multiple modalities, including topical therapies, systemic therapies (non-biologics and biologics), surgical therapies, lifestyle changes, and management of comorbidities. Management can often be clinically challenging and may involve the combination of medical and surgical approaches for optimal results. The purpose of this review is to present an update on non-biologic and non-interventional modalities published in 2019-2021 in the clinical management of HS. With emerging therapies, ongoing clinical trials, and heightened awareness about HS, there is hope that new treatment options will revolutionize the management of patients suffering from HS.

Identification of Biomarkers and Critical Evaluation of Biomarker Validation in Hidradenitis Suppurativa: A Systematic Review

Importance

The identification and validation of biomarkers in hidradenitis suppurativa (HS) has potential to improve the understanding and management of this chronic, burdensome disease.

Objective

To systematically identify all known HS biomarkers, categorize them by biomarker type, and critically evaluate their validity according to established criteria.

Evidence Review

Eligibility criteria for this review (PROSPERO Registration 230830) included randomized clinical trials, uncontrolled clinical trials, cohort studies, case-control studies, and other observational studies with no restrictions of patient age, sex, race or ethnicity, or language of publication up until December 31, 2020. All articles were categorized into biomarker type, defined using the US Food and Drug Administration Biomarkers, Endpoints, and other Tools (BEST) glossary. Assessment of each identified biomarker was undertaken in line with the US Food and Drug Administration and European Medicines Agency guidelines for the validation of proposed biomarkers. Assessment of the strength of overall data regarding individual biomarkers was undertaken using the Grading of Recommendations, Assessment, Development, and Evaluations (GRADE) approach.

Findings

A total of 3953 nonduplicate articles were screened, of which 1429 articles were retrieved based on the include/exclusion criteria applied. After full-text screen and data extraction, 106 articles were included in this review. The evidence of strength of 6 categories of biomarkers (susceptibility/risk, diagnostic, monitoring, predictive, prognostic, and pharmacodynamic/response biomarkers) was assessed using GRADE criteria. A total of 48 biomarkers were identified with a minimum GRADE rating of moderate. Only 1 diagnostic (serum IL-2R), 1 monitoring (dermal Doppler vascularity), and 2 predictive biomarkers (epithelialized tunnels and positive family history of HS) achieved a GRADE rating of high. None of the identified biomarkers had sufficient clinical validity to be recommended for routine use in the clinical setting.

Conclusions and Relevance

Major barriers to the identification, validation, and introduction of routine biomarkers in the management of HS include lack of independent biomarker validation studies (especially assumption-free "omics"-based techniques); insufficient assessment of collinearity between identified or proposed biomarkers; and a lack of routine integration of biomarkers into the structure of clinical trials. International consensus among researchers, clinicians, and pharmaceutical stakeholders is required to standardize goals and methods and encourage biomarker integration into future HS clinical trials. This systematic review presents a number of priorities for near-term future research to overcome such barriers and limitations of biomarkers in HS.

Guidance on COVID-19 Vaccination in Hidradenitis Suppurativa Patients: A Modified Delphi Consensus of Experts

Introduction

Hidradenitis suppurativa (HS) patients may be at increased risk of COVID-19 infection and complications from their medications and comorbidities. There is a lack of expert consensus on recommendations for the COVID-19 vaccine for HS patients. Herein, we aim to provide expert-driven consensus recommendations regarding COVID-19 vaccinations in HS patients.

Methods

A modified Delphi consensus survey developed by a core committee of 7 dermatologist HS experts consisting of 4 demographic questions and 12 practice statements was distributed to the US HS Foundation-sponsored provider listserv. Participants were attending physician HS experts. Survey results were to be reviewed by the core group and revised and resubmitted until consensus (≥70% agreement) was achieved.

Results

Among the 33 survey participants, there were 30 (87%) dermatologists, 1 general surgeon, 1 plastic surgeon, and 1 rheumatologist. Consensus for all 12 statements on vaccine counseling and HS treatment counseling was achieved after the first round.

Discussion/Conclusion

For now, this consensus can serve as a resource for clinicians discussing COVID-19 vaccination with their HS patients. These recommendations will need to be updated as new evidence on COVID-19 emerges.

Evaluation of a Case Series of Patients With Palmoplantar Pustulosis in the United States

Importance

Palmoplantar pustulosis (PPP) is a is a chronic, orphan disease with limited epidemiological data.

Objective

To describe the clinical characteristics, treatments, longitudinal disease course, and health care utilization in adults with PPP across the US.

Design, Setting, and Participants

This retrospective, longitudinal case series from 20 academic dermatology practices in the US included a consecutive sample of 197 adults who met the European Rare and Severe Psoriasis Expert Network consensus definition for PPP between January 1, 2007, and December 31, 2018. Data analysis was performed June 2020 to December 2020.

Main Outcomes and Measures

The primary outcome was to describe the patient characteristics, associated medical comorbidities, treatment patterns, complications, and PPP-specific health care utilization.

Results

Of 197 patients, 145 (73.6%) were female, and the mean (SD) age at presentation was 53.0 (12.6) years, with a mean (SD) follow-up time of 22.1 (28.0) months. On initial presentation, 95 (48.2%) patients reported skin pain, and 39 (19.8%) reported difficulty using hands and/or feet. Seventy patients (35.5%) were treated with systemic treatments, and use of more than 20 different systemic therapies was reported. In patients with at least 6 months of follow-up (n = 128), a median (IQR) of 3.7 (4-10) dermatology visits per year were reported; 24 (18.8%) patients had 5 or more visits during the study period.

Conclusions and Relevance

In this case series, PPP was associated with persistent symptoms, continued health care utilization, and a lack of consensus regarding effective treatments, emphasizing the unmet medical need in this population. Additional research is necessary to understand treatment response in these patients.

Healthcare Resource Use in Patients with Immune-Mediated Conditions Treated with Targeted Immunomodulators During COVID-19 Pandemic: A Retrospective Claims Analysis

INTRODUCTION

The impact of the COVID-19 pandemic on routine medical care may result in altered healthcare resource use in patients with immune-mediated conditions. The aim of this study was to determine the impact of treatment interruptions in patients with and without COVID-19 infections who were treated with targeted immunomodulators (TIMs) in the USA.

METHODS

Data from the IBM^® MarketScan^® Research Databases were analyzed in patients with immune-mediated conditions from January 1, 2018, through December 31, 2020. Healthcare resource use (HCRU) including hospitalizations, emergency department (ED) visits, in-person outpatient visits, and respiratory outcomes was assessed in a cohort of patients without COVID-19 who had uninterrupted versus interrupted TIM use. The impact of treatment interruption on HCRU and respiratory outcomes was also evaluated in a cohort of patients with COVID-19. Results from adjusted logistic regression were reported as adjusted odds ratios (aORs) with 95% confidence intervals.

RESULTS

Approximately 25% of patients in both the COVID-19 (N = 787) and non-COVID-19 cohorts (N = 77,178) experienced interruptions in TIM therapy. In the non-COVID-19 cohort, the likelihood of being hospitalized was 20% less in patients with uninterrupted versus interrupted TIM use (aOR = 0.80, 95% CI 0.71-0.90). Patients with uninterrupted TIM use had a similar likelihood of an ED visit (aOR = 0.99, 95% CI 0.91-1.08) and respiratory outcome (aOR = 0.97, 95% CI 0.71-1.31) versus patients with interrupted TIM use. The likelihood of having an in-person outpatient visit was 87% greater in patients with uninterrupted versus interrupted TIM use (aOR = 1.87, 95% CI 1.81-1.94). Similar findings were observed in the COVID-19 cohort.

CONCLUSION

This analysis of real-world claims data showed that uninterrupted TIM use was not associated with an increased likelihood of hospitalizations, ED visits, or negative respiratory outcomes compared to interrupted TIM use among patients with immune-mediated conditions, regardless of COVID-19 diagnosis.

Learning from disease registries during a pandemic: Moving toward an international federation of patient registries

High-quality dermatology patient registries often require considerable time to develop and produce meaningful data. Development time is influenced by registry complexity and regulatory hurdles that vary significantly nationally and institutionally. The rapid emergence of the coronavirus disease 2019 (COVID-19) global pandemic has challenged health services in an unprecedented manner. Mobilization of the dermatology community in response has included rapid development and deployment of multiple, partially harmonized, international patient registries, reinventing established patient registry timelines. Partnership with patient organizations has demonstrated the critical nature of inclusive patient involvement. This global effort has demonstrated the value, capacity, and necessity for the dermatology community to adopt a more cohesive approach to patient registry development and data sharing that can lead to myriad benefits. These include improved utilization of limited resources, increased data interoperability, improved ability to rapidly collect meaningful data, and shortened response times to generate real-world evidence. We call on the global dermatology community to support the development of an international federation of patient registries to consolidate and operationalize the lessons learned during this pandemic. This will provide an enduring means of applying this knowledge to the maintenance and development of sustainable, coherent, and impactful patient registries of benefit now and in the future.

Hidradenitis Suppurativa in the Pediatric Population: An International, Multicenter, Retrospective, Cross-sectional Study of 481 Pediatric Patients

Importance

Hidradenitis suppurativa (HS) in pediatric patients has been understudied. Increased awareness and recognition of HS prevalence in children demand efforts to better understand this condition.

Objective

To describe the demographics, clinical features, treatment, associated comorbidities, and outcomes in a large cohort of pediatric patients with HS.

Design, Setting, and Participants

International, multicenter, retrospective medical record review of pediatric patients (aged 1-18 years) with a clinical diagnosis of HS carried out in 10 dermatology clinics across the US, Canada, Israel, Australia, and Italy from January 1996 to January 2017.

Main Outcomes and Measures

Patient demographics, clinical features, severity, associated comorbidities, and treatments in pediatric patients with HS.

Results

This cross-sectional study included 481 patients diagnosed with HS. Overall, 386 (80%) were girls. The mean (SD) age of disease onset was 12.5 (2.9) years, and the mean (SD) age at diagnosis was 14.4 (3.5) years. Family history of HS was present in 111 of 271 (41%) patients. First signs/symptoms reported at disease onset were cyst/abscess in 229 of 481 (48%), pain/tenderness in 118 of 481 (25%), and papules/pustules in 117 of 481 (24%). At initial dermatologic assessment, 233 of 481 (48%) patients already had evidence of skin scarring. Disease severity (Hurley staging) was documented in 288 of 481 (60%) patients (47% stage 1, 45% stage 2 and 8% stage 3). Comorbid conditions were reported in 406 of 481 (85%) patients, the most common being obesity (263/406 [65%]) and acne vulgaris (118/406 [29%]). Complications occurred in 378 of 481 (79%) patients, the most common of which were scars or contractures (301/378 [80%]).

Conclusions and Relevance

The findings of this study indicate that there is a gap in recognizing and diagnosing pediatric HS. Pediatric patients with HS are likely to present with other comorbidities. Prospective observational and interventional studies are needed to better understand clinical course and optimal treatments for pediatric HS.

Standardizing Hidradenitis Suppurativa Skin Microbiome Research: The Methods Matter

Cutaneous dysbiosis is implicated in hidradenitis suppurativa (HS) pathogenesis. Previous studies reveal skin microbiota shifts in HS lesional skin. In their report, Riverain-Gillet et al. (2020) extended these findings and reported skin microbiota shifts in unaffected HS skinfolds as well. Their study suggests that skin microbial shifts may precede clinical lesions and draws attention to study methods important for skin microbiome research.

Evaluation of Hidradenitis Suppurativa Disease Course During Pregnancy and Postpartum

Importance

Hidradenitis suppurativa (HS) disproportionately affects women of childbearing potential. There is a paucity of data regarding the HS disease course during pregnancy and in the postpartum period.

Objective

To explore the HS disease course during pregnancy and in the postpartum period.

Design, Setting, and Participants

A retrospective cohort study was conducted on patients in the Henry Ford Health System, Detroit, Michigan-a large, academic, urban referral center. Women with a diagnosis of HS who became pregnant between January 1, 2008, and December 31, 2018, were included. International Classification of Diseases, Ninth Revision, and International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, were used for identification of the diagnosis.

Exposures

Pregnancy in patients with HS.

Main Outcomes and Measures

Hidradenitis suppurativa disease status during pregnancy and the postpartum period.

Results

A total of 127 women with HS were included in this study and accounted for 202 pregnancies. Of the 202 pregnancies, 171 were in black women, 25 in white women, 3 in women of other race/ethnicity, and 3 had unreported data. Mean (SD) age at HS onset was 19.3 (5.6) years; at time of HS diagnosis, 24.4 (5.3) years; and at time of pregnancy, 25.9 (5.0) years. The disease worsened during pregnancy in 70 pregnancies (61.9%), did not change in 34 pregnancies (30.1%), and improved in 9 pregnancies (8.0%). Hidradenitis suppurativa exacerbated in the postpartum period after 82 of 124 pregnancies (66.1%). Dermatologists were involved in managing HS in 28 pregnancies (14.4%) and for a higher proportion of patients with more severe Hurley stage as compared with cases of mild disease (stage 3: 7 of 18 [38.9%] vs stage 1: 10 of 100 [10.0%] or stage 2: 11 of 67 [16.4%]; P = .004). In addition, HS medical treatment was administered during 77 pregnancies (38.1%), while HS procedural treatment was administered during 34 pregnancies (16.8%). A significantly higher proportion of patients whose care was managed by dermatologists vs those without dermatologist involvement received any HS medication (22 [78.6%] vs 53 [31.7%], P < .001) or any HS procedure (14 [50%] vs 19 [11.4%], P < .001) during pregnancy.

Conclusions and Relevance

Despite a high rate of HS exacerbation during pregnancy and postpartum, this cohort study found that most of the patients did not receive HS-directed medical treatment or care from a dermatologist during pregnancy. Close monitoring and improved collaborative care between dermatology and obstetrics-gynecology services is warranted.

Diagnosis and management of hidradenitis suppurativa in women

Hidradenitis suppurativa is a chronic inflammatory disease that disproportionately affects women of childbearing age. Hidradenitis suppurativa is characterized by painful nodules, abscesses, draining dermal tunnels, and scarring with a predilection for intertriginous sites, such as the axilla, groin, and breast regions. Delay in diagnosis and treatment of hidradenitis suppurativa often results in long-term sequelae leading to significant morbidity, and rarely mortality, in these patients. This clinical opinion suggests that obstetrician-gynecologists are uniquely poised to recognize early signs of hidradenitis suppurativa during routine well-woman examinations and initiate treatment or referral to dermatology. Herein, we provide clinical pearls for obstetrician-gynecologists caring for female patients with hidradenitis suppurativa, including strategies for comprehensive management and recommendations to improve the comfort of patients with hidradenitis suppurativa during examinations.

Characterizing perimenstrual flares of hidradenitis suppurativa

BACKGROUND

Hidradenitis suppurativa (HS) predominantly affects women of childbearing age, and sex hormones are thought to play a role in HS pathogenesis. However, there is a paucity of data regarding the pattern of HS perimenstrual flares, as well as patient responses to hormone-based therapies.

OBJECTIVE

We aimed to characterize the temporal pattern of perimenstrual flares, as well as factors associated with perimenstrual flares. We also sought to investigate responses to hormonal therapies in women with HS.

METHODS

An anonymous web-based questionnaire was distributed to various online HS support groups in May 2020.

RESULTS

A total of 283 participants met the inclusion criteria as adult women who self-reported having HS and menstrual cycles. The majority (176 of 282 women; 62.4%) reported HS worsening with menses, and 86.9% (153 of 176 women) noted that perimenstrual HS flares occurred always or often. Most women (138 of 175 women; 78.9%) reported that their HS flared in the week preceding menses. Perimenstrual HS flares were more likely in women with a family history of HS compared with those without (49.6% vs. 28.2%; p = .019). More than a third of respondents who had been treated with spironolactone reported improvement of HS symptoms, but more than a quarter of participants who used medroxyprogesterone acetate or used a hormonal intrauterine device reported worsened HS symptoms.

CONCLUSION

Female patients with HS have high rates of perimenstrual HS flares, specifically during the week preceding the onset of menses. Additional investigations on the role of sex hormones in HS pathogenesis and the efficacy of hormone-based therapies are warranted.

Immunopathogenesis of hidradenitis suppurativa and response to anti-TNF-α therapy

Hidradenitis suppurativa (HS) is a highly prevalent, morbid inflammatory skin disease with limited treatment options. The major cell types and inflammatory pathways in skin of patients with HS are poorly understood, and which patients will respond to TNF-α blockade is currently unknown. We discovered that clinically and histologically healthy appearing skin (i.e., nonlesional skin) is dysfunctional in patients with HS with a relative loss of immune regulatory pathways. HS skin lesions were characterized by quantitative and qualitative dysfunction of type 2 conventional dendritic cells, relatively reduced regulatory T cells, an influx of memory B cells, and a plasma cell/plasmablast infiltrate predominantly in end-stage fibrotic skin. At the molecular level, there was a relative bias toward the IL-1 pathway and type 1 T cell responses when compared with both healthy skin and psoriatic patient skin. Anti–TNF-α therapy markedly attenuated B cell activation with minimal effect on other inflammatory pathways. Finally, we identified an immune activation signature in skin before anti–TNF-α treatment that correlated with subsequent lack of response to this modality. Our results reveal the fundamental immunopathogenesis of HS and provide a molecular foundation for future studies focused on stratifying patients based on likelihood of clinical response to TNF-α blockade.

Hidradenitis suppurativa lesions are characterized by alterations in cDC2s, relatively reduced Tregs, an influx of memory B cells and plasma cells, and biases towards IL1 pathway activation and type 1 T cell responses.

Office-Based Surgical Intervention for Hidradenitis Suppurativa (HS): A Focused Review for Dermatologists

Easily accessible office-based procedures that require minimal resources may facilitate timely surgical management of hidradenitis suppurativa (HS). This review focuses on excision and unroofing as two surgical HS treatments that can be tailored to the outpatient setting. Fifty-five articles were included in our review, representing 3914 patients. The majority were retrospective studies (58%, n = 32), and the studies reported data both across patients and by number of treated lesions. Recurrence rates for unroofing (14.5%) were found to be half that of excision (30%) across patients (p = 0.015) and slightly lower across lesions [20% recurrence vs 26% for excision (p = 0.023)]. Complication rates at the lesion level were also significantly associated with procedure, with rates after excision more than double those after roofing (26% vs. 12%, p < 0.001). The complication rate after combined medical and surgical therapy did not differ between procedures. Studies also suggest that continuing medical therapy in the perioperative period may be associated with improved recurrence rates, although delayed wound healing with biologic therapy has been reported. The existing data are limited by low-quality uncontrolled studies with small sample sizes, variable reporting of outcomes, and lack of uniform definitions for recurrence and remission. Further systematic prospective studies are needed to better compare complication and recurrence rates across these procedures in HS, especially in the context of concomitant medical therapy.

The TNFRSF members CD27 and OX40 coordinately limit TH17 differentiation in regulatory T cells

Regulatory T cells (T_regs) are closely related to T_H17 cells and use aspects of the T_H17-differentiation program for optimal immune regulation. In several chronic inflammatory human diseases, T_regs express IL-17A, suggesting that dysregulation of T_H17-associated pathways in T_regs may result in either loss of suppressive function and/or conversion into pathogenic cells. The pathways that regulate the T_H17 program in T_regs are poorly understood. We have identified two TNF receptor superfamily (TNFRSF) members, CD27 and OX40, that are preferentially expressed by skin-resident T_regs Both CD27 and OX40 signaling suppressed the expression of T_H17-associated genes from T_regs in a cell-intrinsic manner in vitro and in vivo. However, only OX40 played a nonredundant role in promoting T_reg accumulation. T_regs that lacked both CD27 and OX40 were defective in controlling skin inflammation and expressed high levels of IL-17A, as well as the master T_H17 transcription factor, RORγt. Last, we found that CD27 expression was inversely correlated with T_reg IL-17 production in skin of patients with psoriasis and hidradenitis suppurativa. Together, our results suggest that TNFRSF members play both redundant and distinct roles in regulating T_reg plasticity in tissues.