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A Trial of Pembrolizumab in Combination With Chemotherapy and Radiotherapy in Stage III NSCLC (KEYNOTE-799, MK-3475-799)

A Phase 2 Trial of Pembrolizumab (MK-3475) in Combination With Platinum Doublet Chemotherapy and Radiotherapy for Participants With Unresectable, Locally Advanced Stage III Non-Small Cell Lung Cancer (NSCLC) (KEYNOTE-799)

Status
Completed
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT03631784
Acronym
KEYNOTE-799
Enrollment
216
Registered
2018-08-15
Start date
2018-10-19
Completion date
2024-03-19
Last updated
2025-03-25

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Non-small Cell Lung Cancer

Keywords

Programmed Cell Death-1 (PD1, PD-1), Programmed Cell Death 1 Ligand 1 (PDL1, PD-L1), Programmed Cell Death 1 Ligand 2 (PDL2, PD-L2)

Brief summary

This is a trial in adult participants with unresectable, locally advanced, Stage III non-small cell lung cancer (NSCLC) treated with pembrolizumab in combination with platinum doublet chemotherapy and standard thoracic radiotherapy followed by pembrolizumab monotherapy. The primary hypothesis of the trial is that within each platinum doublet chemotherapy cohort, the percentage of participants who develop Grade 3 or higher pneumonitis is ≤10% and estimation of objective response rate (ORR) by blinded independent central review (BICR).

Interventions

Pembrolizumab 200 mg intravenous (IV) infusion on Days 1 of each 3-week cycle for up to 17 cycles

DRUGPaclitaxel 45 mg/m^2

Paclitaxel 45 mg/m\^2 IV infusion on Days 1, 8, 15 of each 3-week cycle for Cycles 2, and 3 during radiation therapy.

DRUGCarboplatin AUC6

Carboplatin AUC6 IV infusion on Day 1 of the 21-day cycle for Cycle 1.

Cisplatin 75 mg/m\^2 IV infusion on Day 1 of each 21-day cycle for Cycles 1, 2, 3.

Pemetrexed 500 mg/m\^2 IV infusion on Day 1 of each 21-day cycle for Cycles 1, 2, and 3.

The target total dose of TRT will be 60 Gy in 30 daily fractions of 2 Gy, prescribed to the planning target volume.

Paclitaxel 200 mg/m\^2 IV infusion on Day 1 of the 21-day cycle of Cycle 1.

DRUGCarboplatin AUC2

Carboplatin AUC2 IV infusion on Day 1, 8, 15 for Cycles 2 and 3 during radiation therapy.

Sponsors

Merck Sharp & Dohme LLC
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Male/female participants, who are at least 18 years of age on the day of signing informed consent with previously untreated, unresectable, pathologically confirmed NSCLC and Stage IIIA, IIIB or IIIC NSCLC by American Joint Committee on Cancer Version 8. * No evidence of metastatic disease by whole body positron emission tomography/computed tomography (PET/ CT) scan, diagnostic quality CT scan, and brain imaging. * Have measurable disease per RECIST 1.1 as assessed by the local site investigator/radiology. * Have provided tumor tissue sample (core, incisional, or excisional biopsy). * Have an Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1. * Have adequate pulmonary function test (PFT) * Have adequate organ function * A male participant must agree to use contraception through the end of treatment and refrain from donating sperm during this period. * A female participant is eligible to participate if she is not pregnant, not breastfeeding, and if participant is a woman of childbearing potential (WOCBP), agrees to follow the contraceptive guidance as provided in the protocol through the end of treatment.

Exclusion criteria

* A WOCBP who has a positive urine pregnancy test within 72 hours prior to treatment allocation * Has small cell lung cancer. * Has had documented weight loss \>10% in the preceding 3 months. * Participants whose radiation treatment plans are likely to encompass a volume of whole lung receiving \>20 Gy in total (V20) of more than 31% of lung volume. * Has received prior radiotherapy to the thorax, including radiotherapy to the esophagus or for breast cancer. * Has received prior therapy with an anti-PD-1, anti-PD-L1, or anti-PD-L2 agent (programmed cell death protein 1 \[PD-1\] and its ligands, programmed cell death ligand 1 (PD-L1) and programmed cell death ligand 2 \[PD-L2\]) or with an agent directed to another stimulatory or co-inhibitory T-cell receptor (eg, CTLA-4, OX-40, CD137). * Has received a live vaccine within 30 days prior to the first dose of study drug. * Has had an allogenic tissue/solid organ transplant. * Is currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks prior to the first dose of study treatment. * Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg prednisone daily or equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study drug. * Has a known additional malignancy that is progressing or has required active treatment within the past 5 years. * Has severe hypersensitivity (Grade 3 or higher) to pembrolizumab and/or any of its excipients. * Has a known severe hypersensitivity (Grade 3 or higher) to any of the study chemotherapy agents and/or to any of their excipients. * Has an active autoimmune disease that has required systemic treatment in past 2 years (ie, with use of disease modifying agents, corticosteroids or immunosuppressive drugs). * Has a history of (non-infectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease that requires steroids. * Has an active infection requiring systemic therapy. * Has a known history of human immunodeficiency virus (HIV) infection. HIV testing is not required unless mandated by local health authority. * Has a known history of hepatitis B (defined as hepatitis B surface antigen \[HBsAg\] reactive) or known active hepatitis C virus (defined as HCV RNA \[qualitative\] is detected) infection. * Has a known history of active tuberculosis (TB; Bacillus tuberculosis). * Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the study, interfere with the participant's participation for the full duration of the study, or is not in the best interest of the participant to participate, in the opinion of the treating investigator. * Has a known psychiatric or substance abuse disorder that would interfere with cooperating with the requirements of the study. * Is pregnant or breastfeeding or expecting to conceive or father children within the projected duration of the study through the end of treatment.

Design outcomes

Primary

MeasureTime frameDescription
Percentage of Participants Who Developed Grade 3 or Higher PneumonitisUp to approximately 3 yearsPneumonitis included the MedDRA preferred terms for radiation pneumonitis are acute interstitial pneumonitis, autoimmune lung disease, interstitial lung disease, pneumonitis, idiopathic pneumonia syndrome, organizing pneumonia, and immune-mediated pneumonitis. As per common terminology criteria for Adverse Events, version 4.0, pneumonitis was graded as follows: Grade (Gr) 1- asymptomatic, clinical or diagnostic observations only; intervention not indicated; Gr 2- symptomatic, medical intervention indicated, limiting instrumental activities of daily living (ADL); Gr 3- severe symptoms; limiting self-care activities of daily living (ADL), oxygen indicated; Gr 4- life-threatening respiratory compromise; urgent intervention indicated (e.g., tracheotomy or intubation); Gr 5- death.
Overall Response Rate (ORR) Per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1)Up to approximately 3 yearsORR was defined as the percentage of participants who experienced a complete response (CR; disappearance of all target lesions) or a partial response (PR; at least a 30% decrease in the sum of diameters of target lesions) and was assessed using modified RECIST 1.1 by blinded independent central review (BICR).

Secondary

MeasureTime frameDescription
Progression Free Survival (PFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1)Up to approximately 5 1/2 yearsPFS was defined as the time from the first dose of study treatment to the date of the first documentation of disease progression, as determined by BICR per RECIST 1.1 or death due to any cause (whichever occurred first). Disease progression was defined as at least 20 percent (%) increase (including an absolute increase of at least 5 millimeters \[mm\]) in the sum of diameter of target lesions, taking as reference the smallest sum, and/or unequivocal progression of existing non-target lesions, and/or appearance of 1 or more new lesions. PFS was estimated and analyzed using the product-limit (Kaplan-Meier) method for censored data.
Overall Survival (OS)Up to approximately 5 1/2 yearsOS is defined as the time from enrollment to death due to any cause. OS was estimated and analyzed using the product-limit (Kaplan-Meier) method for censored data.
Number of Participants Who Experienced an Adverse Event (AE)Up to approximately 1 1/2 yearsAn AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study intervention. The number of participants with at least one AE was assessed.
Number of Participants Who Discontinued From Study Treatment Due to an AEUp to approximately 1 yearAn AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study intervention. The number of participants who discontinued treatment due to an AE was assessed.

Countries

Australia, France, Germany, New Zealand, Poland, Russia, South Korea, Spain, United Kingdom, United States

Participant flow

Recruitment details

Participants with unresectable, locally advanced, Stage III non-small cell lung cancer (NSCLC), who had received no prior anticancer therapy for their disease were recruited into two cohorts.

Pre-assignment details

Of 216 participants enrolled/allocated in the trial, 214 received treatment.

Participants by arm

ArmCount
Pembrolizumab + cCRT + Paclitaxel + Carboplatin
Participants received 1 cycle of carboplatin area under the curve (AUC) 6 mg/mL/min with paclitaxel 200 mg/m\^2 and pembrolizumab 200 mg on Day 1. Approximately 3 weeks later, participants received carboplatin AUC 2 mg/mL/min with paclitaxel 45 mg/ m\^2 administered weekly for 6 weeks along with 2 cycles of pembrolizumab 200 mg administered every 3 weeks (Q3W) in conjunction with standard thoracic radiotherapy (TRT) (60 Gray \[Gy\] in 2 Gy fractions administered 5 days per week for 6 weeks). Participants then received 14 additional cycles of pembrolizumab 200 mg administered Q3W. 1 cycle=21 days.
112
Pembrolizumab + cCRT + Pemetrexed + Cisplatin
Participants received 3 cycles of cisplatin 75 mg/m\^2 with pemetrexed 500 mg/m\^2 and pembrolizumab 200 mg on Day 1 of each cycle. Treatment was given in conjunction with standard TRT (60 Gy in 2 Gy fractions administered 5 days per week for 6 weeks) in cycles 2 and 3. Participants then received 14 additional cycles of pembrolizumab 200 mg administered Q3W. 1 cycle=21 days.
104
Total216

Withdrawals & dropouts

PeriodReasonFG000FG001
Overall StudyDeath7149
Overall StudyLost to Follow-up10
Overall StudyParticipants Ongoing10
Overall StudySponsor's Decision3652
Overall StudyWithdrawal by Subject33

Baseline characteristics

CharacteristicPembrolizumab + cCRT + Pemetrexed + CisplatinTotalPembrolizumab + cCRT + Paclitaxel + Carboplatin
Age, Continuous63.2 Years
STANDARD_DEVIATION 9.4
64.5 Years
STANDARD_DEVIATION 9.3
65.7 Years
STANDARD_DEVIATION 9.1
Ethnicity (NIH/OMB)
Hispanic or Latino
3 Participants5 Participants2 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
84 Participants185 Participants101 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
17 Participants26 Participants9 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants1 Participants1 Participants
Race (NIH/OMB)
Asian
11 Participants25 Participants14 Participants
Race (NIH/OMB)
Black or African American
4 Participants5 Participants1 Participants
Race (NIH/OMB)
More than one race
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants0 Participants0 Participants
Race (NIH/OMB)
Unknown or Not Reported
14 Participants21 Participants7 Participants
Race (NIH/OMB)
White
75 Participants164 Participants89 Participants
Sex: Female, Male
Female
40 Participants76 Participants36 Participants
Sex: Female, Male
Male
64 Participants140 Participants76 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
deaths
Total, all-cause mortality
72 / 11249 / 104
other
Total, other adverse events
106 / 112100 / 102
serious
Total, serious adverse events
66 / 11246 / 102

Outcome results

Primary

Overall Response Rate (ORR) Per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1)

ORR was defined as the percentage of participants who experienced a complete response (CR; disappearance of all target lesions) or a partial response (PR; at least a 30% decrease in the sum of diameters of target lesions) and was assessed using modified RECIST 1.1 by blinded independent central review (BICR).

Time frame: Up to approximately 3 years

Population: The analysis population consisted of all participants who received at least 1 dose of study treatment.

ArmMeasureValue (NUMBER)
Pembrolizumab + cCRT + Paclitaxel + CarboplatinOverall Response Rate (ORR) Per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1)71.4 Percentage of Participants
Pembrolizumab + cCRT + Pemetrexed + CisplatinOverall Response Rate (ORR) Per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1)75.5 Percentage of Participants
Primary

Percentage of Participants Who Developed Grade 3 or Higher Pneumonitis

Pneumonitis included the MedDRA preferred terms for radiation pneumonitis are acute interstitial pneumonitis, autoimmune lung disease, interstitial lung disease, pneumonitis, idiopathic pneumonia syndrome, organizing pneumonia, and immune-mediated pneumonitis. As per common terminology criteria for Adverse Events, version 4.0, pneumonitis was graded as follows: Grade (Gr) 1- asymptomatic, clinical or diagnostic observations only; intervention not indicated; Gr 2- symptomatic, medical intervention indicated, limiting instrumental activities of daily living (ADL); Gr 3- severe symptoms; limiting self-care activities of daily living (ADL), oxygen indicated; Gr 4- life-threatening respiratory compromise; urgent intervention indicated (e.g., tracheotomy or intubation); Gr 5- death.

Time frame: Up to approximately 3 years

Population: The analysis population consisted of all participants who received at least one dose of study drug.

ArmMeasureValue (NUMBER)
Pembrolizumab + cCRT + Paclitaxel + CarboplatinPercentage of Participants Who Developed Grade 3 or Higher Pneumonitis8.0 Percentage of Participants
Pembrolizumab + cCRT + Pemetrexed + CisplatinPercentage of Participants Who Developed Grade 3 or Higher Pneumonitis6.9 Percentage of Participants
Secondary

Number of Participants Who Discontinued From Study Treatment Due to an AE

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study intervention. The number of participants who discontinued treatment due to an AE was assessed.

Time frame: Up to approximately 1 year

Population: The analysis population consisted of all participants who received at least one dose of study drug.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pembrolizumab + cCRT + Paclitaxel + CarboplatinNumber of Participants Who Discontinued From Study Treatment Due to an AE48 Participants
Pembrolizumab + cCRT + Pemetrexed + CisplatinNumber of Participants Who Discontinued From Study Treatment Due to an AE26 Participants
Secondary

Number of Participants Who Experienced an Adverse Event (AE)

An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a study intervention. The number of participants with at least one AE was assessed.

Time frame: Up to approximately 1 1/2 years

Population: The analysis population consisted of all participants who received at least one dose of study drug.

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pembrolizumab + cCRT + Paclitaxel + CarboplatinNumber of Participants Who Experienced an Adverse Event (AE)108 Participants
Pembrolizumab + cCRT + Pemetrexed + CisplatinNumber of Participants Who Experienced an Adverse Event (AE)101 Participants
Secondary

Overall Survival (OS)

OS is defined as the time from enrollment to death due to any cause. OS was estimated and analyzed using the product-limit (Kaplan-Meier) method for censored data.

Time frame: Up to approximately 5 1/2 years

Population: The analysis population consisted of all participants who received at least 1 dose of study treatment.

ArmMeasureValue (MEDIAN)
Pembrolizumab + cCRT + Paclitaxel + CarboplatinOverall Survival (OS)35.6 Months
Pembrolizumab + cCRT + Pemetrexed + CisplatinOverall Survival (OS)56.7 Months
Secondary

Progression Free Survival (PFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1)

PFS was defined as the time from the first dose of study treatment to the date of the first documentation of disease progression, as determined by BICR per RECIST 1.1 or death due to any cause (whichever occurred first). Disease progression was defined as at least 20 percent (%) increase (including an absolute increase of at least 5 millimeters \[mm\]) in the sum of diameter of target lesions, taking as reference the smallest sum, and/or unequivocal progression of existing non-target lesions, and/or appearance of 1 or more new lesions. PFS was estimated and analyzed using the product-limit (Kaplan-Meier) method for censored data.

Time frame: Up to approximately 5 1/2 years

Population: The analysis population consisted of all participants who received at least 1 dose of study treatment.

ArmMeasureValue (MEDIAN)
Pembrolizumab + cCRT + Paclitaxel + CarboplatinProgression Free Survival (PFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1)29.0 Months
Pembrolizumab + cCRT + Pemetrexed + CisplatinProgression Free Survival (PFS) Per Response Criteria in Solid Tumors Version 1.1 (RECIST 1.1)45.3 Months

Source: ClinicalTrials.gov · Data processed: Feb 21, 2026