MEDI9447(Oleclumab) Pancreatic Chemotherapy Combination Study.

An adverse event (AE) is any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. A serious adverse event (SAE) is an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. The TEAEs are defined as events present at baseline that worsened in intensity after administration of study drug or events absent at baseline that emerged after administration of study drug.

DLT: Any study drug related Grade (G)3 or higher toxicity including: any G4 immune-mediated AEs, >=G3 colitis/pneumonitis/interstitial lung disease (ILD), >=G3 nausea/vomiting/diarrhea that does not resolve to G2 or less within 3 days of maximal supportive care (MSC), G2 pneumonitis/ILD that does not resolve within 7 days of initiation of MSC, G4 anemia, G3 anemia with clinical sequelae/requires >2 units of red blood cells transfusion, G4 thrombocytopenia/neutropenia >=7 days, G3/4 thrombocytopenia with >=G3 hemorrhage, G4 febrile neutropenia (FN), G3 FN lasting >=5 days while receiving MSC, isolated G3 liver transaminase elevation (LTE)/ isolated G3 total bilirubin (TBL) that does not downgrade to G1 or less within 14 days of onset, isolated G4 LTE or TBL, elevated aspartate aminotransferase/alanine aminotransferase >3×upper limit of normal (ULN) and concurrent TBL >2×ULN without cholestasis or alternative explanations, any other toxicity judged as a DLT by Dose Escalation Committee.

Number of participants with abnormal vital signs (temperature, blood pressure, pulse rate, and respiratory rate) reported as TEAEs are reported.

Number of participants with abnormal ECG parameters reported as TEAEs are reported.

Number of participants with abnormal clinical laboratory parameters reported as TEAEs are reported.

The OR is defined as best overall response of confirmed complete response (CR) or confirmed partial response (PR) based on RECIST v1.1 guidelines. The CR is defined as disappearance of all target lesions (TLs) and non-target lesions (NTLs), any pathological lymph nodes (target and non-target) must have reduction in short axis < 10 mm, and no new lesions. The PR is defined as at least a 30% decrease in the sum of the diameters (SoD) of TLs (compared to baseline) and no new lesions. Confirmation of CR and PR is required by a repeat, consecutive assessment no less than 4 weeks from the date of first documentation. Percentage of participants with OR is reported.

An AE is any untoward medical occurrence in a participant who received study drug without regard to possibility of causal relationship. An SAE is an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; life threatening experience (immediate risk of dying); persistent or significant disability/incapacity; congenital anomaly. The TEAEs are defined as events present at baseline that worsened in intensity after administration of study drug or events absent at baseline that emerged after administration of study drug.

Number of participants with abnormal vital signs (temperature, blood pressure, pulse rate, and respiratory rate) reported as TEAEs are reported.

Number of participants with abnormal ECG parameters reported as TEAEs are reported.

Number of participants with abnormal clinical laboratory parameters reported as TEAEs are reported.

The OR is defined as best overall response of confirmed CR or confirmed PR based on RECIST v1.1 guidelines. The CR is defined as disappearance of all target and non-target lesions, any pathological lymph nodes (target and non-target) must have reduction in short axis < 10 mm, and no new lesions. The PR is defined as at least a 30% decrease in the sum of the diameters of target lesions (compared to baseline) and no new lesions. Confirmation of CR and PR is required by a repeat, consecutive assessment no less than 4 weeks from the date of first documentation. Percentage of participants with OR is reported.

The DC is defined as confirmed CR, PR, or stable disease (SD) (maintained for >=8 weeks). The CR is defined as disappearance of all TLs and NTLs, any pathological lymph nodes (target and non-target) must have reduction in short axis <10 mm, and no new lesions. The PR is defined as at least a 30% decrease in the SoD of TLs (compared to baseline) and no new lesions. Confirmation of CR and PR is required by a repeat, consecutive assessment no less than 4 weeks from date of first documentation. The SD is defined as neither sufficient shrinkage of TLs to qualify for PR nor sufficient increase of TLs to qualify for progressive disease (PD), taking as reference the smallest SoD while on study, and no new lesions. The PD is defined as at least a 20% increase in SoD of TLs, taking as reference the smallest sum on study and an absolute increase of at least 5 mm of SoD, or unequivocal progression of existing NTLs, or the appearance of new lesion/s. Percentage of participants with DC is reported.

The overall survival is defined as the time from the randomization until death due to any cause. For participants who were alive at the time of data cut off, overall survival was censored on the last date when participants were known to be alive. The overall survival is assessed using the Kaplan-Meier method. The number of participants with overall survival events (deaths) is reported.

The overall survival is defined as the time from the randomization until death due to any cause. For participants who were alive at the time of data cut off, overall survival was censored on the last date when participants were known to be alive. The overall survival is assessed using the Kaplan-Meier method.

Progression-free survival (PFS) is defined as the time from randomization until the first documentation of a PD or death due to any cause, whichever occurred first, regardless of whether the participant received subsequent anticancer treatment prior to progression. The PD is defined as at least a 20% increase in sum of the diameters of target lesions, taking as reference the smallest sum on study and an absolute increase of at least 5 mm of sum of the diameters, or unequivocal progression of existing non-target lesions, or the appearance of new lesion/s. Participants who had no documented progression and were still alive at the time of analysis were censored at the time of the latest date of assessment from their last evaluable RECIST v1.1 assessment. The PFS is assessed using the Kaplan-Meier method. The number of participants with PFS events is reported.

The PFS is defined as the time from randomization until the first documentation of a PD or death due to any cause, whichever occurred first, regardless of whether the participant received subsequent anticancer treatment prior to progression. The PD is defined as at least a 20% increase in sum of the diameters of target lesions, taking as reference the smallest sum on study and an absolute increase of at least 5 mm of sum of the diameters, or unequivocal progression of existing non-target lesions, or the appearance of new lesion/s. Participants who had no documented progression and were still alive at the time of analysis were censored at the time of the latest date of assessment from their last evaluable RECIST v1.1 assessment. The PFS is assessed using the Kaplan-Meier method.

The DoR is defined as the time from the first documentation of an OR until the first documentation of a PD or death due to any cause, whichever occurs first. The OR is defined as best overall response of confirmed CR or PR based on RECIST v1.1 guidelines. The CR is defined as disappearance of all TLs and NTLs, any pathological lymph nodes (target and non-target) must have reduction in short axis < 10 mm, and no new lesions. The PR is defined as at least a 30% decrease in the SoD of TLs (compared to baseline) and no new lesions. Confirmation of CR and PR is required by a repeat, consecutive assessment no less than 4 weeks from the date of first documentation. The PD is defined as at least a 20% increase in SoD of TLs, taking as reference the smallest sum on study and an absolute increase of at least 5 mm of SoD, or unequivocal progression of existing NTLs, or the appearance of new lesion/s. The DoR is assessed using the Kaplan-Meier method.

The DC is defined as confirmed CR, PR, or stable disease (SD) (maintained for >=8 weeks). The CR is defined as disappearance of all TLs and NTLs, any pathological lymph nodes (target and non-target) must have reduction in short axis <10 mm, and no new lesions. The PR is defined as at least a 30% decrease in the SoD of TLs (compared to baseline) and no new lesions. Confirmation of CR and PR is required by a repeat, consecutive assessment no less than 4 weeks from date of first documentation. The SD is defined as neither sufficient shrinkage of TLs to qualify for PR nor sufficient increase of TLs to qualify for PD, taking as reference the smallest SoD while on study, and no new lesions. The PD is defined as at least a 20% increase in SoD of TLs, taking as reference the smallest sum on study and an absolute increase of at least 5 mm of SoD, or unequivocal progression of existing NTLs, or the appearance of new lesion/s. Percentage of participants with DC is reported.

The OR is defined as best overall response of confirmed CR or confirmed PR based on RECIST v1.1. The CR is defined as disappearance of all TLs and NTLs, any pathological lymph nodes (target and non-target) must have reduction in short axis <10 mm, and no new lesions. The PR is defined as at least a 30% decrease in the SoD of TLs (compared to baseline) and no new lesions. Confirmation of CR and PR is required by a repeat, consecutive assessment no less than 4 weeks from the date of first documentation. The OR is assessed by cluster of differentiation 73 (CD73) expression level either low or high at baseline. The CD73 low is defined as no CD73 expression in tumor cells or <50% of tumor cells with 2+ or 3+ intensity and CD73 high is defined as CD73 expression with 2+ or 3+ intensity in >=50% of tumor cells.

The overall survival is defined as the time from the randomization until death due to any cause. For participants who were alive at the time of data cut off, overall survival was censored on the last date when participants were known to be alive. The overall survival is assessed by CD73 expression level either low or high at baseline using the Kaplan-Meier method. The CD73 low is defined as no CD73 expression in tumor cells or <50% of tumor cells with 2+ or 3+ intensity and CD73 high is defined as CD73 expression with 2+ or 3+ intensity in >=50% of tumor cells. The number of participants with overall survival events (deaths) is reported.

The overall survival is defined as the time from the randomization until death due to any cause. For participants who were alive at the time of data cut off, overall survival was censored on the last date when participants were known to be alive. The overall survival is assessed by CD73 expression level either low or high at baseline using the Kaplan-Meier method. The CD73 low is defined as no CD73 expression in tumor cells or <50% of tumor cells with 2+ or 3+ intensity and CD73 high is defined as CD73 expression with 2+ or 3+ intensity in >=50% of tumor cells.

PFS: Time from randomization until first documentation of PD/death due to any cause, whichever occurred first, regardless of whether participant received subsequent anticancer treatment prior to progression. PD:>=20% increase in SoD of TLs and an absolute increase of >= 5 mm of SoD/unequivocal progression of existing NTLs/appearance of new lesion. Participants who had no documented progression and were still alive at the time of analysis were censored at time of latest date of assessment from their last evaluable RECIST v1.1 assessment. PFS is assessed by CD73 expression level either low/high at baseline using Kaplan-Meier method. CD73 low: No CD73 expression in tumor cells/<50% of tumor cells with 2+/3+ intensity. CD73 high: CD73 expression with 2+/3+ intensity in >=50% of tumor cells. Number of participants with PFS events is reported.

The PFS is defined as the time from randomization until the first documentation of a PD or death due to any cause, whichever occurred first, regardless of whether the participant receives subsequent anticancer treatment prior to progression. The PD is defined as at least a 20% increase in SoD of TLs, taking as reference the smallest sum on study and an absolute increase of at least 5 mm of SoD, or unequivocal progression of existing NTLs, or the appearance of new lesion/s. Participants who had no documented progression and were still alive at time of analysis were censored at time of latest date of assessment from their last evaluable RECIST v1.1 assessment. PFS is assessed by CD73 expression level either low/high at baseline using Kaplan-Meier method. CD73 low: No CD73 expression in tumor cells/<50% of tumor cells with 2+/3+ intensity. CD73 high: CD73 expression with 2+/3+ intensity in >=50% of tumor cells.

Number of participants with positive ADA to oleclumab are reported. Persistent positive is defined as positive at >= 2 post-baseline assessments (with >=16 weeks between first and last positive) or positive at last post-baseline assessment. Transient positive is defined as negative at last post-baseline assessment and positive at only one post-baseline assessment or at >= 2 post-baseline assessments (with <16 weeks between first and last positive). Treatment-boosted ADA is defined as baseline ADA positive titer that was boosted to a 4-fold or higher level following drug administration.

Number of participants with positive ADA to durvalumab are reported. Persistent positive is defined as positive at >= 2 post-baseline assessments (with >=16 weeks between first and last positive) or positive at last post-baseline assessment. Transient positive is defined as negative at last post-baseline assessment and positive at only one post-baseline assessment or at >= 2 post-baseline assessments (with <16 weeks between first and last positive). Treatment-boosted ADA is defined as baseline ADA positive titer that was boosted to a 4-fold or higher level following drug administration.

Serum concentrations of oleclumab are reported.

Serum concentrations of durvalumab are reported.

Plasma concentrations of gemcitabine and metabolite dFdU are reported.

Plasma concentrations of nab-paclitaxel are reported.