Difference between SLE classification and diagnosis and importance of attribution. Response to: 'Do the 2019 EULAR/ACR SLE classification criteria close the door on certain groups of SLE patients?' by Chi et al.

In their letter, Dr Chi and colleagues1 express two concerns regarding the new European League Against Rheumatism/American College of Rheumatology (EULAR/ACR) classification criteria. On the one hand, they correctly remark that patients with uncommon, isolated organ manifestations may be more difficult to classify with any set of classification criteria. On the other hand, they caution against mistaking malignancies for systemic lupus erythematosus (SLE). The first sensitivity-related issue is certainly correct. However, it is important to reiterate that the new EULAR/ACR criteria are classification …