i. Relapse is defined as a patient who has previously achieved a CR or PR, but after a period of 6 or more months, demonstrates evidence of disease progression. ii. Refractory is defined as failing to achieve a CR or PR, or disease progression within 6 months after initiation of treatment with an approved BTK or PI3K inhibitor (eg, ibrutinib, idelalisib) or venetoclax. iii. Intolerance is defined as the inability to continue treatment with a BCR PI or venetoclax due to toxicities or due to development of a contraindication that makes the subject ineligible to receive further treatment with a BCR PI or venetoclax.