Localized Acral Sclerosing Langerhans Cell Histiocytosis: A New Form of Presentation of Cutaneous Langerhans Cell Histiocytosis.

Langerhans cell histiocytosis (LCH) is a rare proliferative disorder, more frequent in children, characterized by an abnormal accumulation of Langerhans cells admixed with eosinophils, lymphocytes, neutrophils, and macrophages. The clinical presentation is variable and depends on whether a single or multiple organs are affected. Skin lesions are common in LCH (40% of cases) and represent a frequent form of presentation (in up to 80% of cases). Cutaneous manifestations of LCH are highly variable, frequently presenting as crusted papules or scaly seborrheic-like lesions localized in the scalp. We report the first case of a localized acral sclerosing LCH, a new form of LCH. This case highlights the broad and surprising form of presentation of LCH which may be overlooked and can significantly delay its diagnosis. The development of systemic disease may occur months to years after the initial skin presentation. Prompt diagnosis and treatment may prevent progression to systemic disease, as documented in some cases.

Tocilizumab in patients with Takayasu arteritis: a retrospective study and literature review.

OBJECTIVES: To assess the efficacy of tocilizumab (TCZ) in patients with Takayasu arteritis (TA). METHODS: Multicentre open-label retrospective study. RESULTS: Eight patients (all women) with a mean age of 34±16 years, median 36 years (range: 7-57) were assessed. The main clinical features at TCZ therapy onset were: constitutional symptoms (n=4), fever (n=3), headache (n=2), chest pain (n=1), abdominal pain (n=1), mesenteric ischaemia (n=1), myalgia involving the lower limbs (n=1), cerebral vascular insufficiency (n=1), malaise (n=1), upper limb claudication (n=1) and nodular scleritis (n=1). Besides corticosteroids and before TCZ treatment onset, 7 of 8 patients had also received several conventional immunosuppressive and/or biologic agents. Seven patients experienced marked clinical improvement in the first 3 months after the onset of TCZ therapy. After a median follow-up of 15.5 [interquartile range-IQR: 12-24] months, 7 patients were asymptomatic. The median C-reactive protein decreased from 3.09 [IQR: 0.5-12] to 0.15 [IQR: 0.1-0.5] mg/dL (p=0.018), and median erythrocyte sedimentation rate from 40 [IQ range: 28-72] to 3 [IQR: 2-5] mm/1st hour (p=0.012). The median dose of prednisone was also tapered from 42.5 [IQR: 25-50] to 2.5 [IQR: 0-7.5] mg/day (p=0.011). However, TCZ had to be discontinued in 1 patient because she developed a systemic lupus erythematosus, and in another patient due to inefficiency. TCZ dose was reduced in a patient because of mild thrombocytopenia. CONCLUSIONS: TCZ appears to be effective in the management of patients with TA, in particular in patients refractory to corticosteroids and/or conventional immunosuppressive drugs.

The LIM homeodomain factor Lhx2 is required for hypothalamic tanycyte specification and differentiation.

Hypothalamic tanycytes, a radial glial-like ependymal cell population that expresses numerous genes selectively enriched in embryonic hypothalamic progenitors and adult neural stem cells, have recently been observed to serve as a source of adult-born neurons in the mammalian brain. The genetic mechanisms that regulate the specification and maintenance of tanycyte identity are unknown, but are critical for understanding how these cells can act as adult neural progenitor cells. We observe that LIM (Lin-11, Isl-1, Mec-3)-homeodomain gene Lhx2 is selectively expressed in hypothalamic progenitor cells and tanycytes. To test the function of Lhx2 in tanycyte development, we used an intersectional genetic strategy to conditionally delete Lhx2 in posteroventral hypothalamic neuroepithelium, both embryonically and postnatally. We observed that tanycyte development was severely disrupted when Lhx2 function was ablated during embryonic development. Lhx2-deficient tanycytes lost expression of tanycyte-specific genes, such as Rax, while also displaying ectopic expression of genes specific to cuboid ependymal cells, such as Rarres2. Ultrastructural analysis revealed that mutant tanycytes exhibited a hybrid identity, retaining radial morphology while becoming multiciliated. In contrast, postnatal loss of function of Lhx2 resulted only in loss of expression of tanycyte-specific genes. Using chromatin immunoprecipitation, we further showed that Lhx2 directly regulated expression of Rax, an essential homeodomain factor for tanycyte development. This study identifies Lhx2 as a key intrinsic regulator of tanycyte differentiation, sustaining Rax-dependent activation of tanycyte-specific genes while also inhibiting expression of ependymal cell-specific genes. These findings provide key insights into the transcriptional regulatory network specifying this still poorly characterized cell type.

An examination of the mechanisms involved in secondary clinical failure to adalimumab or etanercept in inflammatory arthropathies.

BACKGROUND: Biological therapies against tumor necrosis factor α have revolutionized the treatment of several inflammatory rheumatic diseases. However, 30% of responders will present a clinical failure after having controlled the disease for at least 6 months (secondary clinical failure). Biological therapies may induce an unwanted immune response, which may alter the bioavailability of the drug causing a loss of clinical response. OBJECTIVE: The objective of this study was to assess the correlation between secondary clinical failure (based on Disease Activity Score in 28 Joints or Bath Ankylosing Spondylitis Disease Activity Index) and the type of mechanism involved in failure (based on drug levels) in patients with inflammatory arthropathies treated with anti-tumor necrosis factor α. METHODS: Drug and antidrug antibodies (ADAs) serum levels were determined by enzyme-linked immunosorbent assay immediately before drug administration in patients with rheumatoid arthritis, ankylosing spondylitis, and psoriatic arthritis who presented secondary clinical failure after at least 6 months of treatment with adalimumab (ADL) or etanercept (ETN). RESULTS: Thirty-six patients with secondary clinical failure were recruited: 63.88% had rheumatoid arthritis, 22.22% had psoriatic arthritis, and 13.88% had ankylosing spondylitis; 58.33% did not respond to ADL, whereas 41.66% did not to ETN. None of the patients treated with ETN showed either subtherapeutic drugs levels or ADAs (failure due to a primary mechanism) whereas it was found that 23.80% of the patients treated with ADL had subtherapeutic drug levels for reasons attributable to immunogenicity (failure due to a secondary mechanism; P = 0.000048). CONCLUSIONS: We suggest the utility of measuring drug and ADA levels in patients with secondary clinical failure to ADL for a better optimization and rational use, but not in patients who fail to ETN.

CNS involvement and treatment with interferon-α are independent prognostic factors in Erdheim-Chester disease: a multicenter survival analysis of 53 patients.

Erdheim-Chester disease (ECD) is a rare form of non-Langerhans histiocytosis, with noncodified therapeutic management and high mortality. No treatment has yet been shown to improve survival in these patients. We conducted a multicenter prospective observational cohort study to assess whether extraskeletal manifestations and interferon-α treatment would influence survival in a large cohort of ECD patients. To achieve this goal, we thoroughly analyzed the clinical presentation of 53 patients with biopsy-proven ECD, and we performed a survival analysis using Cox proportional hazard model. Fifty-three patients (39 men and 14 women) with biopsy-proven ECD were followed up between November 1981 and November 2010. Forty-six patients (87%) received interferon-α and/or PEGylated interferon-α. Multivariate survival analysis using Cox proportional hazard model revealed that central nervous system involvement was an independent predictor of death (hazard ratio = 2.51; 95% confidence interval, 1.28-5.52; P = .006) in our cohort. Conversely, treatment with interferon-α was identified as an independent predictor of survival (hazard ratio = 0.32; 95% confidence interval, 0.14-0.70; P = .006). Although definitive confirmation would require a randomized controlled trial, these results suggest that interferon-α improves survival in ECD patients. This may be seen as a significant advance, as it is the first time a treatment is shown to improve survival in this multisystemic disease with high mortality.

Life-threatening vasculo-Behçet following discontinuation of infliximab after three years of complete remission.

Behçet's disease (BD) is a chronic, complex multisystem vasculitis of unknown cause characterised for its ability to involve blood vessels of all sizes on both the arterial and venous sides of the circulation. It has been suggested that TNF-alpha plays a main role in the pathogenesis of BD. This hypothesis is supported by the efficacy of TNF-blocking antibodies in these patients, which have been shown to be very powerful in the induction of remission and as maintenance treatment on different BD manifestations, including severe vascular involvement. However, little is known about when and how to stop IFX after long-standing complete remission of these patients to avoid relapses. We describe a case of BD without previous vascular involvement that developed myocardial infarction and severe venous thromboses only four months after discontinuation of infliximab (IFX) after more than three years of complete remission. The patient did not respond to corticosteroids and intravenous cyclophosphamide and only recovered completely after reintroducing IFX.

[Dexamethasone versus weight-adjusted methylprednisolone in patients with moderate-severe SARS-CoV-2 pneumonia]. / Dexametasona frente a metilprednisolona ajustada al peso en pacientes con neumonía moderada-grave por SARS-CoV-2.

OBJECTIVES: To compare the 30-day outcome (mortality and/or ICU admission) of patients admitted for moderate-severe SARS-CoV-2 pneumonia treated with dexamethasone after the Recovery study versus those treated with weight-adjusted methylprednisolone. METHODS: Retrospective cohort study of 65 patients with moderate-severe pneumonia who received dexamethasone 6 mg/day (DXM group) versus 80 treated with weight-adjusted methylprednisolone (MTPN group). RESULTS: Twenty-one (32.3%) patients in the DXM group died vs. 8 (10%) in the MTPN group (p-value < 0.001) and 29 (44.6%) in the DXM group required ICU admission vs. 2 (2.5%) of the MTPN group (p-value < 0.001). There were no baseline differences regarding sociodemographic characteristics with a higher mean qSOFA in the MTPN group. The hazard ratio for mortality and ICU admission adjusted for age, sex, and admission CRP was 2.189 (1.082-4.426; 95% CI) and 10.589 (2.139-48.347; 95% CI) for the DXM group, respectively, vs. MTPN group. CONCLUSIONS: Mortality and admission to the ICU were lower in patients treated with weight-adjusted methylprednisolone compared to those treated with dexamethasone.

Dexamethasone versus weight-adjusted methylprednisolone in patients with moderate-severe SARS-CoV-2 pneumonia.

Objectives: To compare the 30-day outcome (mortality and/or ICU admission) of patients admitted for moderate-severe SARS-CoV-2 pneumonia treated with dexamethasone after the Recovery study versus those treated with weight-adjusted methylprednisolone. Methods: Retrospective cohort study of 65 patients with moderate-severe pneumonia who received dexamethasone 6 mg/day (DXM group) versus 80 treated with weight-adjusted methylprednisolone (MTPN group). Results: 21 (32.3%) patients in the DXM group died vs 8 (10%) in the MTPN group (p-value < 0.001) and 29 (44.6%) in the DXM group required ICU admission vs 2 (2,5%) of the MTPN group (p-value <0.001). There were no baseline differences regarding sociodemographic characteristics with a higher mean qSOFA in the MTPN group. The hazard ratio for mortality and ICU admission adjusted for age, sex, and admission CRP was 2.189 (1.082-4.426; 95% CI) and 10.589 (2.139-48.347; 95% CI) for the DXM group, respectively, vs. MTPN group. Conclusions: Mortality and admission to the ICU were lower in patients treated with weight-adjusted methylprednisolone compared to those treated with dexamethasone.

Objetivos: Comparar el desenlace clínico (mortalidad y/o ingreso en UCI) a 30 días de los pacientes ingresados por neumonía moderada-grave por SARS-CoV-2 tratados con dexametasona tras el estudio Recovery frente aquellos tratados con metilprednisolona ajustada al peso. Métodos: Estudio de cohortes retrospectivo de 65 pacientes con neumonía moderada-grave que recibieron 6 mg/día de dexametasona (grupo DXM) frente a 80 tratados con metilprednisolona ajustada al peso (grupo MTPN). Resultados: Fallecieron 21 (32,3%) pacientes del grupo DXM vs 8 (10%) del grupo MTPN (p-valor < 0,001) y 29 (44,6%) del grupo DXM requirieron ingreso en UCI vs 2 (2,5%) del grupo MTPN (p-valor < 0,001). No hubo diferencias basales respecto a características sociodemográficas con un qSOFA medio superior en el grupo MTPN. La razón de riesgo para la mortalidad y el ingreso en UCI ajustada por edad, sexo y PCR al ingreso fue de 2,189 (1,082−4,426; IC 95%) y 10,589 (2,139−48,347; IC 95%) para el grupo DXM, respectivamente, vs grupo MTPN. Conclusiones: La mortalidad e ingreso en UCI fue menor en pacientes tratados con metilprednisolona ajustada al peso frente a los tratados con dexametasona.

Characteristics and clinical outcome in 312 patients with moderate to severe pneumonia due to SARS-COV-2 and hyperinflammation treated with anakinra and corticosteroids: A retrospective cohort study.

OBJECTIVE: To assess the clinical outcome (death and/or Intensive Care Unit (ICU) admission) based on the time from hospital admission to the administration of anakinra and the possible usefulness of a "simplified" SCOPE score to stratify the risk of worse prognosis in our cohort of patients with moderate/severe SARS-CoV-2 pneumonia, both vaccinated and unvaccinated, that received anakinra and corticosteroids. In addition, the clinical, analytical, and imaging characteristics of patients at admission are described. METHODS: Retrospective cohort study of 312 patients admitted to Hospital Clínico San Cecilio in Granada for moderate/severe pneumonia caused by SARS-CoV-2 that received anakinra and corticosteroids between March 2020 and January 2022. Clinical and analytical data were collected as well as the patient outcome at 30 and 60 days after admission. Three treatment groups were established according to the time from hospital admission to administration of anakinra: early (1st-2nd day), intermediate (3rd-5th day), and late (after the 5th day). RESULTS: The median age was 67.4 years (IQR 22-97 years) and 204 (65.4%) were male. The most common comorbidity was hypertension (58%). The median time from the start of symptoms to anakinra administration was 6 days (IQR 5-10) and the SaFi (SaO2/FiO2) was 228 (IQR 71-471). The cure rate was higher in the early-onset anakinra group versus the late-onset group (73% vs 56.6%). The latter had a higher percentage of deaths (27.4%) and a greater number of patients remained hospitalized for a month (16%). On admission, the patients had elevated C-reactive protein (CRP), ferritin, and D-dimer values and decreased total lymphocytes. Analytical improvement was observed at both 72 hours and one month after treatment. 42 (13.5%) required ICU admission, and 23 (7.3%) orotracheal intubation. At 60 days, 221 (70.8%) were discharged, 87 (27.8%) had died and 4 (1.4%) remained hospitalized. The mean dose of anakinra was 1000 mg (100-2600 mg) with differences found between the dose administered and the clinical outcome. There were no differences in the primary outcome based on vaccination. A simplified SCOPE score at the start of anakinra administration was lower in patients with better clinical evolution. CONCLUSIONS: Early treatment with anakinra and corticosteroids was associated with a better outcome regardless of vaccination status. A simplified SCOPE was found to be a good prognostic tool.

IL-31-dependent neurogenic inflammation restrains cutaneous type 2 immune response in allergic dermatitis.

Despite robust literature associating IL-31 with pruritic inflammatory skin diseases, its influence on cutaneous inflammation and the interplay between inflammatory and neurosensory pathways remain unmapped. Here, we examined the consequences of disrupting Il31 and its receptor Il31ra in a mouse model of house dust mite (HDM)-induced allergic dermatitis. Il31-deficient mice displayed a deficit in HDM dermatitis-associated scratching, consistent with its well-established role as a pruritogen. In contrast, Il31 deficiency increased the number and proportion of cutaneous type 2 cytokine-producing CD4+ T cells and serum IgE in response to HDM. Furthermore, Il4ra+ monocytes and macrophages capable of fueling a feedforward type 2 inflammatory loop were selectively enriched in Il31ra-deficient HDM dermatitis skin. Thus, IL-31 is not strictly a proinflammatory cytokine but rather an immunoregulatory factor that limits the magnitude of type 2 inflammatory responses in skin. Our data support a model wherein IL-31 activation of IL31RA+ pruritoceptors triggers release of calcitonin gene-related protein (CGRP), which can mediate neurogenic inflammation, inhibit CD4+ T cell proliferation, and reduce T cell production of the type 2 cytokine IL-13. Together, these results illustrate a previously unrecognized neuroimmune pathway that constrains type 2 tissue inflammation in the setting of chronic cutaneous allergen exposure and may explain paradoxical dermatitis flares in atopic patients treated with anti-IL31RA therapy.

Carcinoma erysipeloides of laryngeal origin.

The term "carcinoma erysipeloides" (CE) designates an uncommon form of cutaneous metastasis. CE is most often associated with carcinoma of the breast. However, there have been reports of CE from carcinoma of the uterus, prostate, lung, ovary, stomach, tonsils, thyroid, pancreas, rectum, parotid glands and melanoma. To our knowledge, CE of laryngeal origin has not been previously reported. We describe a patient diagnosed with human immunodeficiency virus and hepatitis C virus coinfection who developed a supraglottic laryngeal squamous cell carcinoma and erythematous cutaneous lesions. A skin biopsy demonstrated invasion of dilated dermal lymphatics by clusters of atypical squamous cells with polymorphic nuclei and extensive infiltration of the dermis by tumor cells. The histology of the metastatic cells was similar to that of the laryngeal carcinoma.

Septic arthritis due to Cellulosimicrobium cellulans.

Cellulosimicrobium cellulans has been reported as a rare cause of human pathogenesis. Infections mainly occur in immunocompromised patients and very often are associated with a foreign body. We report the first case of septic arthritis caused by C. cellulans in an immunocompetent patient. Our patient suffered a penetrating palm tree thorn injury to his left knee 8 weeks before admission. Although no foreign objects were found, they were suspected because previous reports suggest a frequent association with this microorganism, and open debridament was performed. Removal of foreign bodies related to this organism must be considered a high-priority treatment in these patients to achieve a complete recovery.

Glucocorticoids alone versus tocilizumab alone or glucocorticoids plus tocilizumab in patients with severe SARS-CoV-2 pneumonia and mild inflammation.

AIM: To assess clinical outcomes according to the immunosuppressive treatment administered to patients with severe SARS-CoV-2 pneumonia and moderate inflammation. METHODS: A retrospective observational cohort study involving 142 patients with severe COVID-19 pneumonia and moderate inflammation divided into three treatment groups (pulses of methylprednisolone alone [group I], tocilizumab alone [group II] and methylprednisolone plus tocilizumab [group III]). The aim was to assess intergroups differences in the clinical course with a 60-day follow-up and related analytical factors. RESULTS: 14 patients (9,8%) died: 8 (10%) in group I and 6 (9,5%) in groups II and III. 15 (10,6%) were admitted to ICU: 2 (2,5%) from group I, 4 (28,5%) from group II and 9 (18,4%) from group III. The mean hospital stay was longer in group II and clinical outcome was not associated with treatment. CONCLUSIONS: Tocilizumab seems to be not associated with better clinical outcomes and should be reserved for clinical trial scenario, since its widespread use may result in higher rate of ICU admission and longer mean hospital stay without differences in mortality rate and potentially adverse events.

OBJETIVOS: Analizar si existen diferencias en desenlaces clínicos según el tratamiento inmunosupresor recibido en pacientes con neumonía grave por SARS-CoV-2 e inflamación moderada. MÉTODOS: Estudio de cohortes retrospectivo de 142 pacientes con neumonía grave COVID-19 e inflamación moderada. Se dividieron en tres grupos de tratamiento (pulsos de metilprednisolona solo [grupo I], tocilizumab solo [grupo II] y metilprednisolona más tocilizumab [grupo III]). Analizamos las diferencias intergrupos en el curso clínico con un seguimiento de 60 días y factores clínicos analíticos relacionados. RESULTADOS: Fallecieron 14 pacientes (9,8%): 8 (10%) del grupo I y 6 (9,5%) de los grupos II y III. Quince (10,6%) ingresaron en UCI: 2 (2,5%) del grupo I, 4 (28,5%) del grupo II y 9 (18,4%) del grupo III. La estancia media hospitalaria fue mayor en los del grupo II. La evolución clínica no se asoció al tratamiento administrado. CONCLUSIONES: El uso de tocilizumab debería reservarse para escenarios de ensayos clínicos. Su utilización generalizada podría acompañarse de mayor estancia media hospitalaria e ingreso en UCI sin diferencias en la mortalidad con un potencial aumento de efectos adversos.

[Glucocorticoids alone versus tocilizumab alone or glucocorticoids plus tocilizumab in patients with severe SARS-CoV-2 pneumonia and mild inflammation]. / Glucocorticoides solos versus tocilizumab solo o glucocorticoides más tocilizumab en pacientes con neumonía grave por SARS-CoV-2 e inflamación moderada.

AIM: To assess clinical outcomes according to the immunosuppressive treatment administered to patients with severe SARS-CoV-2 pneumonia and moderate inflammation. METHODS: A retrospective observational cohort study involving 142 patients with severe COVID-19 pneumonia and moderate inflammation divided into three treatment groups (pulses of methylprednisolone alone [groupI], tocilizumab alone [groupII] and methylprednisolone plus tocilizumab [groupIII]). The aim was to assess intergroups differences in the clinical course with a 60-day follow-up and related analytical factors. RESULTS: 14 patients (9,8%) died: 8 (10%) in groupI and 6 (9,5%) in groupsII andIII. 15 (10,6%) were admitted to ICU: 2 (2,5%) from groupI, 4 (28,5%) from groupII and 9 (18,4%) from groupIII. The mean hospital stay was longer in groupII and clinical outcome was not associated with treatment. CONCLUSIONS: Tocilizumab seems to be not associated with better clinical outcomes and should be reserved for clinical trial scenario, since its widespread use may result in higher rate of ICU admission and longer mean hospital stay without differences in mortality rate and potentially adverse events.

Anakinra after treatment with corticosteroids alone or with tocilizumab in patients with severe COVID-19 pneumonia and moderate hyperinflammation. A retrospective cohort study.

INTRODUCTION: Little evidence appears to exist for the use of anakinra, a recombinant interleukin-1 receptor antagonist, after non-response to treatment with corticosteroids alone or combined with tocilizumab in patients with severe COVID-19 pneumonia and moderate hyperinflammatory state. PATIENTS AND METHODS: A retrospective observational cohort study was carried out involving 143 patients with severe COVID-19 pneumonia and moderate hyperinflammation. They received standard therapy along with pulses of methylprednisolone (group 1) or methylprednisolone plus tocilizumab (group 2), with the possibility of receiving anakinra (group 3) according to protocol. The aim of this study was to assess the role of anakinra in the clinical course (death, admission to the intensive care ward) during the first 60 days after the first corticosteroid pulse. Clinical, laboratory, and imaging characteristics as well as infectious complications were also analyzed. RESULTS: 74 patients (51.7%) in group 1, 59 (41.3%) patients in group 2, and 10 patients (7%) in group 3 were included. 8 patients (10.8%) in group 1 died, 6 (10.2%) in group 2, and 0 (0%) in group 3. After adjustment for age and clinical severity indices, treatment with anakinra was associated with a reduced risk of mortality (adjusted hazard ratio 0.518, 95% CI 0.265-0.910; p = 0.0437). Patients in group 3 had a lower mean CD4 count after 3 days of treatment. No patients in this group presented infectious complications. CONCLUSIONS: In patients with moderate hyperinflammatory state associated with severe COVID-19 pneumonia, treatment with anakinra after non-response to corticosteroids or corticosteroids plus tocilizumab therapy may be an option for the management of these patients and may improve their prognosis.

Tocilizumab in refractory Caucasian Takayasu's arteritis: a multicenter study of 54 patients and literature review.

OBJECTIVE: To assess the efficacy and safety of tocilizumab (TCZ) in Caucasian patients with refractory Takayasu's arteritis (TAK) in clinical practice. METHODS: A multicenter study of Caucasian patients with refractory TAK who received TCZ. The outcome variables were remission, glucocorticoid-sparing effect, improvement in imaging techniques, and adverse events. A comparative study between patients who received TCZ as monotherapy (TCZMONO) and combined with conventional disease modifying anti-rheumatic drugs (cDMARDs) (TCZCOMBO) was performed. RESULTS: The study comprised 54 patients (46 women/8 men) with a median [interquartile range (IQR)] age of 42.0 (32.5-50.5) years. TCZ was started after a median (IQR) of 12.0 (3.0-31.5) months since TAK diagnosis. Remission was achieved in 12/54 (22.2%), 19/49 (38.8%), 23/44 (52.3%), and 27/36 (75%) patients at 1, 3, 6, and 12 months, respectively. The prednisone dose was reduced from 30.0 mg/day (12.5-50.0) to 5.0 (0.0-5.6) mg/day at 12 months. An improvement in imaging findings was reported in 28 (73.7%) patients after a median (IQR) of 9.0 (6.0-14.0) months. Twenty-three (42.6%) patients were on TCZMONO and 31 (57.4%) on TCZCOMBO: MTX (n = 28), cyclosporine A (n = 2), azathioprine (n = 1). Patients on TCZCOMBO were younger [38.0 (27.0-46.0) versus 45.0 (38.0-57.0)] years; difference (diff) [95% confidence interval (CI) = -7.0 (-17.9, -0.56] with a trend to longer TAK duration [21.0 (6.0-38.0) versus 6.0 (1.0-23.0)] months; diff 95% CI = 15 (-8.9, 35.5), and higher c-reactive protein [2.4 (0.7-5.6) versus 1.3 (0.3-3.3)] mg/dl; diff 95% CI = 1.1 (-0.26, 2.99). Despite these differences, similar outcomes were observed in both groups (log rank p = 0.862). Relevant adverse events were reported in six (11.1%) patients, but only three developed severe events that required TCZ withdrawal. CONCLUSION: TCZ in monotherapy, or combined with cDMARDs, is effective and safe in patients with refractory TAK of Caucasian origin.