A Phase 2 interventional study of PF-08634404 and Chemotherapy Regimen 1 in Carcinoma, Non-Small-Cell Lung and Lung Cancer (NSCLC), sponsored by Pfizer. Recruiting at 37 sites in 11 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-10-08.
Sponsored by Pfizer · Phase 2, Interventional, and Treatment
This study is being done to learn more about a new medicine called PF-08634404. The study team wants to understand how well it works when given alone or with chemotherapy. The study is for adults with early stage or locally advanced non-small cell lung cancer (NSCLC) that may or may not be removable with surgery.
The study is seeking participants who:
Have either:
The study has 3 parts and each participant will be assigned to one part by their doctor based on their disease diagnosis:
All treatments will be done at clinical study sites, where a trained medical team will monitor adults during and after each visit.
736 studies on the registry are indexed under Carcinoma; 149 are open to participants now.
This study's planned enrollment of 120 is above the median of 49 across 571 interventional studies indexed under Carcinoma.
Browse Carcinoma studies →Pfizer is the lead sponsor of 3,334 studies on the registry; 149 are open to participants now.
Of its 601 completed or terminated interventional studies of FDA-regulated products, 391 (65%) have results posted.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Participants with any of the following respiratory conditions:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
PD-1, PD-L1 and CTLA-4 are proteins that act as brakes on the immune system. Checkpoint inhibitors, such as pembrolizumab or nivolumab, block them so the immune system can attack a cancer.
PD-L1 can also be measured in a tumour sample. Some scores count stained tumour cells only (TPS); others also count certain immune cells (CPS). The study names the score and the minimum it uses.
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
Cancer that has spread to the leptomeninges, the thin layers covering the brain and spinal cord, and the fluid between them. It is not the same as brain metastases.
Criteria often treat it separately, and many studies leave it out even where treated brain metastases are allowed.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
The US National Cancer Institute’s scale of how severe an adverse event is — any unwanted medical event during a study, such as a symptom, an illness or an abnormal test result, whether or not a treatment caused it. Whether it did is judged separately.
“Side effects of earlier treatment resolved to grade 1 or less” means they have settled to mild or gone.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Biopsy and archival tissue
A biopsy takes a small piece of tissue to examine. “Archival tissue” is a sample already taken, for example at diagnosis, and kept by the hospital.
Whether a stored sample will do depends on when it was taken, how much there is and what the study needs. Ask whether the study accepts your stored sample or needs a new biopsy.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
PD-1, PD-L1 and checkpoint inhibitors
PD-1, PD-L1 and CTLA-4 are proteins that act as brakes on the immune system. Checkpoint inhibitors, such as pembrolizumab or nivolumab, block them so the immune system can attack a cancer.
PD-L1 can also be measured in a tumour sample. Some scores count stained tumour cells only (TPS); others also count certain immune cells (CPS). The study names the score and the minimum it uses.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECOG performance status
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Histologically or cytologically confirmed
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Adjuvant and neoadjuvant
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
RECIST
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Leptomeningeal disease
Cancer that has spread to the leptomeninges, the thin layers covering the brain and spinal cord, and the fluid between them. It is not the same as brain metastases.
Criteria often treat it separately, and many studies leave it out even where treated brain metastases are allowed.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
CTCAE grade
The US National Cancer Institute’s scale of how severe an adverse event is — any unwanted medical event during a study, such as a symptom, an illness or an abnormal test result, whether or not a treatment caused it. Whether it did is judged separately.
“Side effects of earlier treatment resolved to grade 1 or less” means they have settled to mild or gone.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants with treatment naïve early-stage or locally advanced, resectable NSCLC without Actionable Genomic Alterations (AGAs) who are candidates for neoadjuvant treatment will receive intravenous (IV) PF-08634404 in combination with chemotherapy.
Biological: PF-08634404 · Drug: Chemotherapy Regimen 1 · Drug: Chemotherapy Regimen 2
Participants with early-stage or locally advanced, resectable NSCLC without AGAs who did not achieve pCR after standard-of-care (SOC) neoadjuvant chemo-immunotherapy and are candidates for adjuvant treatment will receive PF-08634404 IV.
Biological: PF-08634404
Participants with locally advanced, unresectable NSCLC without AGAs who did not have progressive disease per RECIST 1.1 after definitive, platinum-based concurrent chemoradiotherapy (cCRT) and are candidates for consolidation treatment will receive PF-08634404 IV.
Biological: PF-08634404
Concentrate for solution for infusion
Also known as: SSGJ-707
Injection for intravenous use
Injection for intravenous use
Number of Participants With Adverse Events (AEs)
AEs as characterized by type, frequency, intensity as graded by NCI CTCAE version 5.0, timing, seriousness, and relationship to study intervention(s).
Time frame: Through 90 days after the last dose of study intervention (Part A only: or 90 days after surgery, whichever is later)
Part A: Surgical Feasibility Rate
Surgical Feasibility rate is defined by the proportion of participants undergoing surgery and the proportion of participants with wound complications after surgery.
Time frame: Up to approximately 6 months after first dose
Part A: Pathological Complete Response (pCR) rate per International Association for the Study of Lung Cancer (IASLC) guidelines as assessed by central pathology review
pCR rate by central pathology review is defined as the proportion of participants having pCR as assessed by central pathologist. pCR is defined as the absence of residual tumor in surgical specimens
Time frame: Up to approximately 6 months after first dose
Part A: Major Pathological Response (MPR) rate per IASLC guidelines as assessed by central pathology review
MPR rate by central pathology review is defined as the proportion of participants having MPR as assessed by central pathologist or investigator respectively. MPR is defined as ≤10% residual tumor in surgical specimens.
Time frame: Up to approximately 6 months after first dose
Part A: pCR rate per IASLC guidelines as assessed by investigator
pCR rate by investigator is defined as the proportion of participants having pCR as assessed by investigator. pCR is defined as the absence of residual tumor in surgical specimens.
Time frame: Up to approximately 6 months after first dose
Part A: MPR rate per IASLC guidelines as assessed by investigator
MPR rate by investigator is defined as the proportion of participants having MPR as assessed by central pathologist or investigator respectively. MPR is defined as ≤10% residual tumor in surgical specimens.
Time frame: Up to approximately 6 months after first dose
Part A: Event Free Survival (EFS) per RECIST v1.1 as assessed by investigator
EFS is defined as time from the date of first dose to the first occurrence of disease progression precluding surgery, inability to resect the tumor, disease progression or recurrence after surgery per RECIST v1.1 as assessed by investigator, or death due to any cause.
Time frame: Up to approximately 5 years
Part A: Objective Response Rate (ORR) per RECIST v1.1 as assessed by investigator at the completion of neoadjuvant therapy, prior to surgery
ORR is defined as the proportion of participants with a Best Overall Response (BOR) of Complete Response (CR) or Partial Response (PR) per RECIST v1.1.
Time frame: Up to approximately 5 years
Part B: Disease Free Survival (DFS) per RECIST v1.1 as assessed by investigator
DFS is defined as time from the date of first dose to the date of first documented disease progression or recurrence per RECIST v1.1 as assessed by investigator or death due to any cause, whichever occurs first
Time frame: Up to approximately 5 years
Part C: Confirmed ORR per RECIST v1.1 as assessed by investigator
Confirmed ORR is defined as the proportion of participants in the analysis population having a best overall response (BOR) of confirmed CR or confirmed PR according to RECIST v1.1 as assessed by investigator.
Time frame: Up to approximately 5 years
Part C: Progression Free Survival (PFS) per RECIST v1.1 as assessed by investigator
PFS is defined as the time from the date of first dose to the date of the first documentation of objective Progression Disease (PD) assessed by investigator per RECIST v1.1, or death due to any cause, whichever occurs first
Time frame: Up to approximately 5 years
Overall Survival (OS)
OS is defined as the time from the date of randomization to the date of death due to any cause. OS is secondary outcome measure in Phase 2 portion of the study.
Time frame: Up to approximately 5 years
Rate of circulating tumor DNA (ctDNA) reduction or clearance
Reduction in ctDNA is defined as a decrease in ctDNA burden from baseline to a specified on-treatment time point. ctDNA clearance is defined as a 100% reduction in ctDNA burden.
Time frame: Part A: Up to 18 months, Part B and Part C: Up to 37 days after the last dose of treatment
Number of participants with Laboratory abnormalities
Laboratory abnormalities as characterized by type, frequency, severity (as graded by NCI CTCAE version 5.0).
Time frame: Through 90 days after the last dose of study intervention (Part A only: or 90 days after surgery, whichever is later)
Pharmacokinetics: Serum concentrations of PF-086344
Time frame: Up to 37 days after the last dose of treatment, prior to surgery
Incidence of antidrug antibody against PF-08634404
Time frame: Up to 37 days after the last dose of treatment, prior to surgery
Plan to share: Yes — Pfizer will provide access to individual de-identified participant data and related study documents (e.g. protocol, Statistical Analysis Plan (SAP), Clinical Study Report (CSR)) upon request from qualified researchers, and subject to certain criteria, conditions, and exceptions. Further details on Pfizer's data sharing criteria and process for requesting access can be found at: https://www.pfizer.com/science/clinical_trials/trial_data_and_results/data_requests.
Data sharing details ↗ · www.pfizer.com
Started Jun 2026 (actual). Primary completion is estimated for Jul 2028, 24 months after the start.
Of 83 phase 2 interventional studies under Carcinoma, half reached primary completion within 54 months of starting (the median), counting those still running; a quarter within 31 and three quarters within 88. This study's planned 24 months is below that.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
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Studies of the drug tested here: Anti-PD-1/Anti-VEGF Bispecific Antibody PF-08634404