T-cell Developmental Status in Patients With Malignant Hematological Tumors

Inclusion Criteria: 1. Age ≥ 18 years; both genders included; expected survival \> 3 months; 2. Cohort 1: Patients with newly diagnosed or relapsed B-cell lymphoma confirmed by histopathology, bone marrow pathology, flow cytometry, morphology, and genetic testing; Cohort 2: Patients with newly diagnosed or relapsed multiple myeloma confirmed by the same methods; Cohort 3: Healthy volunteers; 3. Able to understand and voluntarily sign the informed consent form. Exclusion Criteria: 1. Significant pulmonary disease: Chronic obstructive pulmonary disease (COPD) with forced expiratory volume in 1 second (FEV1) \<50% of predicted normal value. Note: Suspected COPD cases require FEV1 testing; subjects with FEV1 \<50% of predicted must be excluded. Moderate/severe persistent asthma within the past 2 years, or currently uncontrolled asthma of any severity. (Note: Controlled intermittent or mild persistent asthma is permitted.) 2. Symptomatic congestive heart failure (NYHA Class II-IV), symptomatic/uncontrolled arrhythmias, congenital long QT syndrome, or corrected QT interval (QTc) \>500 ms (Fridericia formula) at screening. 3. History of pulmonary fibrosis, interstitial pneumonia, pneumoconiosis, drug-related pneumonitis, or severely impaired lung function. 4. HIV infection (positive HIV-1/2 antibodies) or known syphilis infection. 5. Unhealed wounds, fractures, gastroduodenal ulcers, persistent fecal occult blood positivity, ulcerative colitis, or other conditions at risk of gastrointestinal bleeding/perforation (as determined by the investigator). 6. Severe neurological/psychiatric disorders, immunodeficiency, hepatitis/cirrhosis, or other conditions deemed unsuitable for study participation by the investigator.