Lymphoplasmacytic Lymphoma (LPL) is a rare type of low-grade B-cell lymphoma. The purpose of this study is to assess the change in disease activity of adult participants with relapsed or refractory Waldenström macroglobulinemia(WM)/LPL receiving venetoclax.
Venetoclax is being investigated in the treatment of WM/LPL. Participants will receive oral venetoclax at doses ramping up to the target dose, as part of treatment. Approximately 14 adult participants with WM/LPL will be enrolled in the study at approximately 20 sites in Japan.
Participants will receive oral venetoclax at doses ramping up to the target dose. The total study duration is approximately 28 months.
There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular visits during the study at a hospital or clinic. The effect of the treatment will be checked by medical assessments, blood tests, and checking for side effects.
Documented diagnosis of Waldenström macroglobulinemia(WM) /lymphoplasmacytic lymphoma (LPL) according to the 5th edition of the World Health Organization (WHO) classification and/or documented clinicopathological diagnosis of WM in accordance with the consensus panel of the second International Workshop on WM (IWWM).
At least one prior standard therapy for WM/LPL.
WM type LPL population: Immunoglobulin M (IgM) >= 500 mg/dL per central laboratory (approximately 14 participants)
Non-IgM type LPL population or IgM < 500 mg/dL: A measurable node having a longest diameter (LDi) greater than 1.5 cm, or a measurable extranodal disease having a LDi greater than 1.0 cm, according to contrast-enhanced computed tomography (CT) scan. (up to 2 participants)
History of prior exposure to venetoclax or BCL-2 targeted therapy.
Uncontrolled active systemic infection.
Known bleeding disorders (e.g., von Willebrand's disease or hemophilia).
Single group
Venetoclax
DrugOral
Number of Participants with Major Response
Major response is defined as participants with a best overall response of complete response (CR), very good partial response (VGPR) or partial response (PR) per independent review committee (IRC) assessment according to International Workshop on Waldenstrom macroglobulinemia (WM) (IWWM)-11 criteria in participants with Immunoglobulin M (IgM) \>= 500 mg/dL at screening.
Number of Participants with Major Response in participants with IgM >= 500 mg/dL
Major response is defined as participants with a best overall response of CR, VGPR or PR per IRC assessment according to IWWM-11.
Progression-Free Survival (PFS)
PFS is defined as time from first study treatment to a documented disease progression (PD) according to IWWM-11 criteria, determined by investigator or death from any cause, whichever occurs first.
Overall Survival (OS)
OS is defined as time from first study treatment to death due to any cause.
Overall Response (OR)
For participants with IgM \>= 500 mg/dL at screening, overall response is defined as participants with a best overall response of CR, VGPR, PR or minor response (MR) per investigator assessment according to IWWM-11 criteria. For participants with IgM \< 500 mg/dL at screening, overall response is defined as participants with the best overall response of CR or PR per investigator assessment according to Revised Response Criteria for Malignant Lymphoma.
Duration of Response (DOR)
For participants with IgM \>= 500 mg/dL at screening, DOR is defined as time from the initial response of CR, VGPR or PR per investigator review according to IWWM-11 criteria to PD or death of any cause, whichever occurs first. For participants with IgM \< 500 mg/dL at screening, DOR is defined as time from the initial response of CR or PR per investigator review according to Revised Response Criteria for Malignant Lymphoma to PD or death of any cause, whichever occurs first. DOR will be summarized for the participants achieving overall response.
