Response to: ‘High risk of systemic lupus erythematosus development in patients with ITP: antiphospholipid syndrome is also a concern?’ by Inancet al

医学 抗磷脂综合征 免疫学 痹症科 结缔组织病 皮肤病科 内科学 自身免疫性疾病 抗体
作者
James Cheng‐Chung Wei,Fang Xiao Zhu,Jing‐Yang Huang
出处
期刊:Annals of the Rheumatic Diseases [BMJ]
卷期号:81 (7): e111-e111 被引量:1
标识
DOI:10.1136/annrheumdis-2020-218402
摘要

Response to: 'High risk of systemic lupus erythematosus development in patients with ITP: antiphospholipid syndrome is also a concern?' by Inanc et alWe thank Inanc et al 1 for their comments on our article entitled 'Risk of systemic lupus erythematosus (SLE) in patients with idiopathic thrombocytopenic purpura (ITP): a population-based cohort study'.In our article, we concluded that ITP is strongly associated with incidental SLE. 2 We agree with Inanc et al 1 that antiphospholipid syndrome (APS) is an important effect modifier in ITP and SLE.We also acknowledge that Inanc et al 1 addressed the difference of APS (2.77% in the ITP group vs 0.02% in the non-ITP controls) in table 1 of our article. 2Actually, ITP, APS and SLE sometimes overlapped in clinical practice.As in table 1, there are more baseline comorbidities in the ITP group, including thrombotic event, cardiovascular disease and ITP.Hence, we did propensity score to match these differences rather than exclude these comorbidities in patient selection as in figure 1.The reason for this is that once you exclude these effect modifiers, then you cannot study their effects.Thus, we prefer matching and stratified analysis on important effect modifiers, rather than exclusion. 3s Inanc et al 1 mentioned, many claim-based or patientreported databases have concerns of validity and uncertainty.Unfortunately, the National Taiwan Insurance Research Database (NHIRD) did not provide laboratory data, such as antinuclear antibody (ANA) and APS profiles.Although this is a limitation, the NHIRD had been validated and appreciated in many high impact publications. 4 5 In our study, we had tried to minimise this information bias by adding sensitivity tests and also stratifies analysis on important confounders, such as thrombosis cardiovascular disease and some infections and life stylerelated diseases to reduce the bias from comorbidities, including APS.These had been discussed in-depth in Discussion section of our article.We agree that APS clinical features and laboratory profiles and ANA are important baseline evaluation for every patient with ITP.It is also indeed our study purpose and conclusion.Furthermore, even though baseline ANA and aPL were negative, we suggest that patients with ITP should still be monitored yearly for clinical and serological lupus or APS.We hope this clinical application will improve the quality of our daily practice.
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