Thalidomide for the Symptomatic Large Granular Lymphocytic Leukemia

Summary

There is currently no standard first-line treatment for LGLL. The investigators used the TPM regimen (thalidomide + prednison + methotrexate ) to treat LGLL since 2020, enrolling a total of 54 patients and achieving an overall response rate (ORR) of 88.9% and a complete response (CR) rate of 75.9%. To further explore this hypothesis, the investigators designed this study to observe the efficacy of thalidomide monotherapy in patients with symptomatic LGLL. The investigators speculate that thalidomide plays a major role in the significant improvement of the TPM regimen compared to the MTX regimen. Patients with LGLL are treated with thalidomide at 50 to 100 mg. If the desired response is not achieved at specific time points, methotrexate is added. Thalidomide monotherapy is administered for up to 3 courses, and the TM regimen can also be used for up to 3 courses. The overall response rate with thalidomide monotherapy serves as the primary study endpoint.

Eligibility

Inclusion Criteria:

1. The patient fully understands the study, voluntarily participates, and signs the informed consent form (ICF);
2. The patient must meet the diagnostic criteria for LGLL;
3. The patient can be of any gender, aged 18 years or older;
4. The patient is either untreated or not properly treated previously, or has poor efficacy (not reaching PR) or relapsed after being treated with regimens not based on methotrexate/thalidomide;
5. The patient has indications for LGLL treatment, meeting at least one of the following criteria:

   1. ANC \< 0.5 × 10\^9/L, or neutropenia with recurrent infections
   2. HGB \< 100 g/L or requiring red blood cell transfusions for maintenance
   3. PLT \< 50 × 10\^9/L
   4. Concurrent autoimmune disease requiring treatment
   5. Symptomatic splenomegaly
   6. Severe B symptoms (unexplained fever, temperature over 38°C; night sweats; weight loss of 10% or more within six months)
   7. Pulmonary hypertension;
6. ECOG score of 0-2;
7. The patient's expected survival period is 6 months or more.

Exclusion Criteria:

1. Unable to understand or follow the study procedures;
2. Diagnosed or treated for malignancies other than LGLL within the past five years;
3. Non-lymphoma-related liver or kidney function impairment: ALT \> 3 times the upper limit of normal (ULN), AST \> 3 times the ULN, total bilirubin (TBIL) \> 2 times the ULN, serum creatinine clearance \< 30 ml/min;
4. Other serious medical conditions that could affect the study (e.g., uncontrolled diabetes, gastric ulcer, other serious heart or lung diseases), with the judgment resting with the investigator;
5. Caprini thrombosis analysis score indicating high risk (Appendix 2);
6. Known history of HIV infection or active HBV infection, or any uncontrolled active systemic infection requiring intravenous antibiotics; Note: Active HBV infection is defined as: a. HBV DNA ≥ 2000 IU/ml; b. ALT ≥ 2 times the ULN; c. Exclusion of hepatitis due to the disease itself, drugs, or other causes. All three conditions must be met. If a patient initially has active HBV infection and turns into inactive HBV infection after anti-HBV treatment, they can be included in the study provided they receive adequate anti-HBV treatment.
7. Patients who have undergone major surgery (excluding lymph node biopsy) within the past 14 days or are expected to undergo major surgery during the treatment;
8. Pregnant or breastfeeding women, and women of childbearing age who are not using contraception;
9. Hypersensitivity to the drugs or their components used in the study.

Conditions3

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