To characterize the safety profile of acalabrutinib alone or in combination with rituximab in subjects with R/R FL. To characterize the activity of acalabrutinib alone or in combination with rituximab in subjects with R/R MZL, as measured by ORR. To characterize the safety of acalabrutinib in combination with rituximab and lenalidomide in subjects with R/R FL.
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