A Randomized, Double-blind, Placebo-controlled Phase II Clinical Study to Evaluate the Safety, Tolerability, Efficacy, and Pharmacokinetic Profile of Genakumab Injection in Patients With Connective Tissue Disease-associated Interstitial Lung Disease

1\. Dosage: 300 mg.2. Duration of administration: All subjects received one dose of Genakumab injection every 4 weeks according to their group.The dose was injected subcutaneously.3. Course of administration: Phase I subjects were treated with Genakumab injection until the end of the study or the occurrence of the drug.Tolerable toxicity or investigator-assessed efficacy (whichever occurs first); The phase 2 randomized double-blind treatment period was 24 weeks, with a total of 6 administration times. After the randomized double-blind treatment period, an open-label treatment period was entered, and all subjects will receive Genakumab injection 300 mg Q4W until the end of the study or the occurrence of intolerable toxicity or poor efficacy assessed by the investigators (whichever occurs first).4. Administration method: subcutaneous injection; The injection site is the abdomen (3 cm away from the navel

1\. Dosage: 300 mg.2. Duration of administration: All subjects received one dose of placebo every 4 weeks according to their group The dose was injected subcutaneously.3. Course of administration: Phase I subjects were treated with placebo until the end of the study or the occurrence of the drug.Tolerable toxicity or investigator-assessed efficacy (whichever occurs first); The phase 2 randomized double-blind treatment period was 24 weeks, with a total of 6 administration times. After the randomized double-blind treatment period, an open-label treatment period was entered, and all subjects will receive placebo 300 mg Q4W until the end of the study or the occurrence of intolerable toxicity or poor efficacy assessed by the investigators (whichever occurs first). 4\. Administration method: subcutaneous injection; The injection site is the abdomen (3 cm away from the navel)