A Study to Compare the Efficacy and Safety of JCAR017 to Standard of Care in Adult Subjects With High-risk, Transplant-eligible Relapsed or Refractory Aggressive B-cell Non-Hodgkin Lymphomas

Time from randomization to death, progressive disease (PD), failure to achieve complete response (CR) or partial response (PR) by 9 weeks or start of new antineoplastic therapy, whichever occurs first. CR: Target nodes masses must regress to ≤ 1.5cm in LDi, no extralymphatic sites, no new lesions. PR: ≥ 50% decrease in sum of diameters of up to 6 target nodes and extranodal sites, no new lesions, spleen must have regressed > 50% in length. PD: LDi > 1.5cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2cm, 1.0cm for lesions > 2cm. Complete metabolic response: Lymph nodes score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease. Partial metabolic response: Lymph nodes score 4 or 5, reduced uptake from baseline, no new lesions, residual uptake higher than normal, reduced from baseline. Progressive metabolic disease: Score 4 or 5 with an increase in uptake intensity from baseline and/or new FDG-avid.

Complete response rate (CRR) is defined as the percentage of participants achieving a best overall response of complete response (CR). Participants with unknown or missing response will be counted as non-evaluable in the analysis. CR: Target nodes/nodal masses must regress to ≤ 1.5 cm in LDi, no extralymphatic sites, no new lesions. Complete metabolic response: Lymph nodes/extralymphatic sites score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease.

The number of participants achieving a best overall response of complete response (CR). Participants with unknown or missing response will be counted as non-evaluable in the analysis. CR: Target nodes/nodal masses must regress to ≤ 1.5 cm in LDi, no extralymphatic sites, no new lesions. Complete metabolic response: Lymph nodes/extralymphatic sites score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease.

Progression-free survival is defined as the time from randomization to progressive disease (PD) or death from any cause, whichever occurs first. Estimates of time to event are from Kaplan-Meier product-limit estimates. PD: LDi > 1.5 cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2 cm, 1.0 cm for lesions > 2 cm. Progressive metabolic disease: Score 4 or 5 with an increase in the intensity of uptake from baseline and/or new FDG-avid.

Overall Survival (OS) is defined as the time from randomization to death due to any cause. Estimates of time to event are from Kaplan-Meier product-limit estimates.

ORR is defined as the percentage of participants achieving a best overall response of partial response (PR) or complete response (CR). CR: Target nodes masses must regress to ≤ 1.5cm in LDi, no extralymphatic sites, no new lesions. PR: ≥ 50% decrease in sum of diameters of up to 6 target nodes and extranodal sites, no new lesions, spleen must have regressed > 50% in length. Complete metabolic response: Lymph nodes score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease. Partial metabolic response: Lymph nodes score 4 or 5, reduced uptake from baseline, no new lesions, residual uptake higher than normal, reduced from baseline.

DoR is defined as the time from first partial or complete response (CR or PR) to disease progression, start of new antineoplastic therapy due to efficacy concerns or death, whichever occurs first. CR: Target nodes masses must regress to ≤ 1.5cm in LDi, no extralymphatic sites, no new lesions. PR: ≥ 50% decrease in sum of diameters of up to 6 target nodes and extranodal sites, no new lesions, spleen must have regressed > 50% in length. PD: LDi > 1.5cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2cm, 1.0cm for lesions > 2cm. Complete metabolic response: Lymph nodes score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease. Partial metabolic response: Lymph nodes score 4 or 5, reduced uptake from baseline, no new lesions, residual uptake higher than normal, reduced from baseline. Progressive metabolic disease: Score 4 or 5 with an increase in uptake intensity from baseline and/or new FDG-avid.

Progression-free Survival (PFS)-2 based on investigator's assessment is defined as time from randomization to second objective progressive disease (PD) or death from any cause, whichever occurs first. Estimates of time to event are from Kaplan-Meier product-limit estimates. PD: LDi > 1.5 cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2 cm, 1.0 cm for lesions > 2 cm. Progressive metabolic disease: Score 4 or 5 with an increase in the intensity of uptake from baseline and/or new FDG-avid.

EFS rate is defined as the percentage of participants free of any EFS event at fixed timepoints. Complete response: Target nodes masses must regress to ≤ 1.5cm in LDi, no extralymphatic sites, no new lesions. Partial response: ≥ 50% decrease in sum of diameters of up to 6 target nodes and extranodal sites, no new lesions, spleen must have regressed > 50% in length. Progression: LDi > 1.5cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2cm, 1.0cm for lesions > 2cm. Complete metabolic response: Lymph nodes score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease. Partial metabolic response: Lymph nodes score 4 or 5, reduced uptake from baseline, no new lesions, residual uptake higher than normal, reduced from baseline. Metabolic progression: Score 4 or 5 with an increase in uptake intensity from baseline and/or new FDG-avid.

Progression-free Survival (PFS) rate is defined as the percentage of participants free of any PFS event at fixed timepoints. Progression-free survival is defined as the time from randomization to progressive disease (PD) or death from any cause, whichever occurs first. Estimates of time to event are from Kaplan-Meier product-limit estimates. PD: LDi > 1.5 cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2 cm, 1.0 cm for lesions > 2 cm. Progressive metabolic disease: Score 4 or 5 with an increase in the intensity of uptake from baseline and/or new FDG-avid.

Overall Survival (OS) rate is defined as the percentage of participants alive at fixed timepoints. OS is defined as the time from randomization to death due to any cause. Participants alive or lost to follow up at the time of analysis will be censored at the last date the participants was known to be alive.

An Adverse Event (AE) is defined as any new untoward medical occurrence or worsening of a pre-existing medical condition in a clinical investigation participant administered study treatment that does not necessarily have a causal relation with this treatment. TEAEs are adverse events occurring or worsening on or after the date of randomization and within 90 days after last dose of chemotherapy (Arm A), or within 90 days after the infusion of JCAR017 (Arm B) or start of new antineoplastic therapy, whichever occurs first as well as those AEs made known to the investigator at any time thereafter that are suspected of being related to study treatment. Graded using Common Terminology Criteria for Adverse Events (CTCAE) version 4.03.

A serious adverse event is defined as any adverse event occurring at any dose that results in death; is life-threatening; requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability/incapacity; is a congenital anomaly/birth defect; or constitutes an important medical event. Treatment emergent adverse events are adverse events occurring or worsening on or after the date of randomization and within 90 days after last dose of chemotherapy (Arm A), or within 90 days after the infusion of JCAR017 (Arm B) or start of new antineoplastic therapy, whichever occurs first as well as those AEs made known to the investigator at any time thereafter that are suspected of being related to study treatment. Graded using Common Terminology Criteria for Adverse Events (CTCAE) version 4.03.

Change from baseline in hemoglobin. Baseline value will be defined as the last value on the randomization date (+3 days) or before the date/time of randomization (date if date/time not collected).

Change from baseline in selected hematology parameters such as leukocytes, lymphocytes, neutrophils, and platelets. Baseline value will be defined as the last value on the randomization date (+3 days) or before the date/time of randomization (date if date/time not collected).

Change from baseline in selected chemistry parameters such as alanine aminotransferase, aspartate aminotransferase, and lactate dehydrogenase. Baseline value will be defined as the last value on the randomization date (+3 days) or before the date/time of randomization (date if date/time not collected).

Change from baseline in selected chemistry parameters such as magnesium, phosphate, potassium, and sodium. Baseline value will be defined as the last value on the randomization date (+3 days) or before the date/time of randomization (date if date/time not collected).

ORR is defined as the percentage of participants achieving a best overall response of partial response (PR) or complete response (CR). CR: Target nodes masses must regress to ≤ 1.5cm in LDi, no extralymphatic sites, no new lesions. PR: ≥ 50% decrease in sum of diameters of up to 6 target nodes and extranodal sites, no new lesions, spleen must have regressed > 50% in length. Complete metabolic response: Lymph nodes score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease. Partial metabolic response: Lymph nodes score 4 or 5, reduced uptake from baseline, no new lesions, residual uptake higher than normal, reduced from baseline.

Time from randomization to death, progressive disease (PD), failure to achieve complete response (CR) or partial response (PR) by 9 weeks or start of new antineoplastic therapy, whichever occurs first. CR: Target nodes masses must regress to ≤ 1.5cm in LDi, no extralymphatic sites, no new lesions. PR: ≥ 50% decrease in sum of diameters of up to 6 target nodes and extranodal sites, no new lesions, spleen must have regressed > 50% in length. PD: LDi > 1.5cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2cm, 1.0cm for lesions > 2cm. Complete metabolic response: Lymph nodes score 1, 2, 3 with/without residual mass on 5-point scale, no new lesions, no FDG-avid disease. Partial metabolic response: Lymph nodes score 4 or 5, reduced uptake from baseline, no new lesions, residual uptake higher than normal, reduced from baseline. Progressive metabolic disease: Score 4 or 5 with an increase in uptake intensity from baseline and/or new FDG-avid.

Progression-free survival is defined as the time from randomization to progressive disease (PD) or death from any cause, whichever occurs first. Estimates of time to event are from Kaplan-Meier product-limit estimates. PD: LDi > 1.5 cm, increase by ≥ 50% from PPD nadir, an increase in LDi or SDi from nadir, 0.5 cm for lesions ≤ 2 cm, 1.0 cm for lesions > 2 cm. Progressive metabolic disease: Score 4 or 5 with an increase in the intensity of uptake from baseline and/or new FDG-avid.

Overall Survival (OS) is defined as the time from randomization to death due to any cause. Estimates of time to event are from Kaplan-Meier product-limit estimates.

Change from baseline in EORTC QLQ-C30 specified parameters including global health/quality of life, cognitive functioning, physical functioning, and fatigue. It is composed of both multi-item scales and single item measures. All of the scales and single-item measures range in score from 0 to 100. A 10-point change in the scoring is considered to be a meaningful change in HRQoL. Functional scale and global health status/HRQoL higher scale score represents a higher level of well-being and better ability of daily functioning. Symptom scale/item higher score represents a high level of symptomatic problem. Baseline value will be defined as the last value on the randomization date (+3 days) or before the date/time of randomization (date if date/time not collected).

Change from Baseline in the Functional Assessment of Cancer Therapy-Lymphoma 15-item lymphoma-specific "Additional concerns" subscale (FACT-Lym). The LYM items are scored on a 0 ("Not at all") to 4 ("Very much") response scale. Items are aggregated to a single score on a 0-60 scale. Baseline value will be defined as the last value on the randomization date (+3 days) or before the date/time of randomization (date if date/time not collected). A meaningful change from baseline in the FACT-Lym score, often referred to as the minimally important difference (MID), typically ranges between 6.5 and 11.2 points for the total score. This range indicates a clinically significant improvement or deterioration in a patient's health-related quality of life.

Hospital resource utilization (HRU) results including hospitalized, reasons for hospitalizations, and admitted to intensive care unit (ICU)

Percentage of Participants Completing High Dose Chemotherapy (HDCT).

Percentage of Participants Completing Hematopoietic Stem Cell Transplant (HSCT).