Background: Lung transplantation represents a potential life-extending therapy for patients with advanced CTD-ILD. This study aims to characterize lung transplant listing outcomes among CTD-ILD patients over a 20-year period using the Organ Procurement and Transplantation Network (OPTN) national database.
Methods: Data analyzed from the OPTN between 2003-2023 included adults ≥18 years of age with CTD-ILD listed for lung transplantation. Patients were categorized into six diagnoses: scleroderma, lupus, rheumatoid arthritis (RA), myositis, Sjögren's, and "Other" (including mixed connective tissue disease, CTD, etc.). Disease and patient specific data were obtained. Trends in listing and outcomes were analyzed in four time periods across the 20 years and among various diagnoses. We used descriptive summary statistics to characterize the sample, and univariate and multivariable logistic regression models to identify factors associated with undergoing lung transplantation.
Results: A total of 1977 CTD-ILD patients were listed. Scleroderma constituted the majority (47%). Listings increased fourfold (185 to 744) from the first to last time periods. Listings for all diagnoses increased with time, with rising representation of non-White patients. Trend noted towards listing patients with more advanced lung disease with time. Transplant rates rose, while wait times, and waitlist mortality declined overtime. All diseases received transplants at comparable rates. Older age, lower lung allocation scores, and male sex were associated with higher odds of transplantation, female sex with lower odds.
Conclusion: Over two decades, CTD-ILD transplant listings have increased in volume, matched with substantially improved outcomes. This reflects the evolution of listing practices and a growing confidence in lung transplantation as a viable option for CTD-ILD.
Objectives: This study aimed to comprehensively assess the clinical spectrum, genotype-phenotype correlations, and treatment responses in a large cohort of Turkish pediatric patients with genetically confirmed mevalonate kinase deficiency (MKD).
Methods: This retrospective, multicenter cohort study included 107 genetically confirmed MKD patients followed between 2010 and 2024 across 25 pediatric rheumatology centers in Turkey. Demographic characteristics, clinical features, laboratory parameters, genotypic data, and treatment outcomes were recorded and analyzed.
Results: Of the 107 patients, 48 (44.9%) were female. The median age at symptom onset was 7 (3-24) months, and the median age at diagnosis was 71 (27-115) months. The most frequent clinical features included fever in 105 (98.1%) patients, abdominal pain in 92 (86%), arthralgia in 74 (69.2%), diarrhea in 73 (68.2%), lymphadenopathy in 64 (59.8%), vomiting in 52 (48.6%), and oral aphthae in 50 (46.7%). Less frequent findings included pancreatitis in 2 (1.9%), genital aphthae in 2 (1.9%), neurosensory hearing loss in 3 (2.8%), and hidradenitis suppurativa in 1 (0.9%) patients. Amyloidosis and MAS were reported in 4 (3.7%) and 4 (3.7%) patients, respectively. Among the 107 patients, 45 (42%) had a homozygous V377I mutation (Group 1), 28 (26.2%) had a compound heterozygous mutation involving V377I and a non-V377I allele (Group 2), 15 (14%) had two non-V377I alleles (Group 3), and 19 (17.8%) had a single heterozygous mevalonate kinase gene mutation (Group 4). No statistically significant differences were observed between the groups in demographic features, attack characteristics, clinical manifestations, laboratory findings, or treatment outcomes. IL-1 antagonists were the primary therapeutic agents. Anakinra yielded no clinical response in 14 (13.1%), partial response in 17 (15.9%), and complete response in 13 (12.1%) patients. Canakinumab treatment resulted in no response in 2 (1.9%) patients, partial response in 34 (31.8%), and complete response in 56 (52.3%).
Conclusions: The variability in clinical manifestations and treatment responses across genotypes highlights the complexity and heterogeneity of MKD, suggesting that factors beyond genotype may influence disease expression and therapeutic outcomes. We also confirm that heterozygous individuals may express the disease phenotype.

