A Study to Investigate Sonrotoclax (BGB-11417) Plus Zanubrutinib (BGB-3111) Compared With Venetoclax Plus Acalabrutinib in Adults With Previously Untreated Chronic Lymphocytic Leukemia

PFS in High-Risk Participants

PFS is defined as the time from the date of randomization to the date of disease progression as determined by IRC or death due to any cause, whichever occurs first.

Time frame: Up to approximately 70 months

Overall Survival (OS)

OS is defined as the time from the date of randomization to the date of death due to any cause.

Time frame: Up to approximately 70 months

Overall Response Rate (ORR) as Determined by IRC

ORR is defined as the percentage of participants with a complete response (CR), complete response with incomplete hematopoietic recovery (CRi), nodal partial response (nPR), or partial response (PR), before disease progression, death, or the start of new anti-CLL treatment (whichever is earlier), as assessed by IRC.

Time frame: Up to approximately 70 months

Rate of Undetectable Minimal Residual Disease at < 10^-5 sensitivity (uMRD5)

Rate of uMRD5 is defined as the percentage of participants who achieved uMRD5 measured in both PB and BMA at the PTFU1 Visit based on NGS, before disease progression, death, or the start of new anti-CLL treatment (whichever is earlier).

Time frame: Up to approximately 16 months

Number of Participants with Adverse Events

Number of participants with treatment-emergent adverse events (TEAEs), adverse events of clinical interest, and serious adverse events (SAEs), including laboratory values, vital signs, and physical examination findings.

Time frame: Up to approximately 70 months

PFS Determined by Investigator Assessment

PFS is defined as the time from the date of randomization to the date of disease progression as determined by investigator or death due to any cause, whichever occurs first.

Time frame: Up to approximately 70 months

Complete Response Rate (CRR) by IRC and Investigator Assessment

CRR is defined as the percentage of participants with a CR or CRi before disease progression, death, or the start of new anti-CLL treatment (whichever is earlier).

Time frame: Up to approximately 70 months

ORR Determined by Investigator Assessment

ORR is defined as the percentage of participants with a complete response or partial response, before disease progression, death, or the start of new anti-CLL treatment (whichever is earlier), as assessed by investigator.

Time frame: Up to approximately 70 months

Duration of Response (DOR)

Duration of response (determined by both IRC and investigator assessment) is defined as the time from the first qualifying response (CR, CRi, nPR, or PR) until CLL progression or death. DOR analysis will only include responders.

Time frame: Up to approximately 70 months

Time to Next Treatment (TTNT)

TTNT is defined as the time from randomization to the start of the next treatment for CLL.

Time frame: Up to approximately 70 months

Change from Baseline in Score on European Organization for Research and Treatment of Cancer (EORTC) Item Library (IL)-409 Questionnaire

Patient-reported symptoms of global health status (GHS), role functioning, and physical functioning, symptom burden and physical condition/fatigue will be measured using the European Organization for Research and Treatment of Cancer quality of life questionnaire EORTC IL-409 (an itemized version of \[EORTC\] quality of life questionnaire core 30 \[QLQ-C30\] and its CLL module CLL17). The EORTC-IL-409 consists of 17 questions answered on a 4-point scale where 1 = Not at all (best) to 4 = Very Much (worst) and 2 global health questions answered on a 7-point scale where 1 = Very poor (worst) to 7 = Excellent (best). Higher scores in GHS and functional scales and lower scores in symptom scales indicate better quality of life.

Time frame: At baseline and up to approximately 70 months