A Phase 2 interventional study of Pembrolizumab in High Grade Meningioma, sponsored by Massachusetts General Hospital. Active, not recruiting at 2 sites in United States. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-10-21.
Sponsored by Massachusetts General Hospital · Phase 2, Interventional, and Treatment
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Among 129 studies in Meningioma with a site in United States — 27 open to participants now, 39 under way, 1 of them phase 3. Meningioma · United States.
Among the 129 studies in Meningioma with a site in United States, this one is the 59th largest by enrollment of the 107 interventional ones that give a count, is one of 8 that started in 2017, is one of 46 in phase 2, reaches primary completion later than 0 of the 37 other live ones, and was the 89th registered.
255 studies on the registry are indexed under Meningioma; 85 are open to participants now.
Browse Meningioma studies →27 of the 129 studies in Meningioma with a site in United States are open now. Recruiting first, the newest first:
Jazz Pharmaceuticals · Sites in United States
Ages 18+
Eben Rosenthal · Sites in United States
Ages 18+
Exelixis · Sites in United States
Ages 18+
University of California, San Francisco · Sites in United States
Ages 18+ · Healthy volunteers
Joshua Palmer · Sites in United States
Ages 18+
A study can be open while its sites in United States have not opened yet or have stopped. Only those recruiting at a site in United States →
Of the 66 Meningioma studies recruiting now, 43 (65%) set no upper age limit and 9 (14%) stop at 75 or younger; 8 take children under 18; 6 take healthy volunteers.
This study: 18 Years and older · all sexes · no healthy volunteers.
The full table on the hub →This tab as a report to print or save as PDF → With an account.
129 studies; the count open now beside each. This study's row is marked.
A study in two phases is counted once above. Listed by phase, each with its combined phases: Phase 1 47 · Phase 2 55 · Phase 3 6 · Phase 4 2
First in 1992; this study’s year is marked. 8 started in 2017.
By drug class, each counting the studies that test any of its medicines:
This study's enrollment of 26 is below the median of 40 across 180 interventional studies indexed under Meningioma.
Median enrollment 30 across the 107 interventional studies, 106 across the 14 observational. Of the 82 that completed or were terminated, 31 (38%) have results posted.
This tab as a report to print or save as PDF → With an account.
11 of 129 have an industry lead sponsor. The 10 most frequent:
Massachusetts General Hospital is the lead sponsor of 2,589 studies on the registry; 447 are open to participants now.
Of its 223 completed or terminated interventional studies of FDA-regulated products, 168 (75%) have results posted.
Massachusetts General Hospital has 5 studies filed under Meningioma — fewer than ten, so there is no comparison to draw.
14 of the studies in Meningioma with a site in United States that are under way reach primary completion within a year, 1 of them phase 3. Phase 3 first, then by date:
| Study | Primary completion |
|---|---|
| NCT03180268Phase 3NRG OncologyObservation or Radiation Therapy in Treating Patients With Newly Diagnosed Grade II Meningioma That Has Been Completely Removed by Surgery | 2027-06-15 |
| NCT05425004Baptist Health South FloridaCabozantinib for Patients With Recurrent or Progressive Meningioma | 2026-12 |
| NCT04087902Ohio State UniversityLong-Term Longitudinal QoL in Patients Undergoing EEA | 2026-12-31 |
| NCT07150806Joshua PalmerRYZ101 for the Treatment of Progressive or Recurrent Intracranial Meningioma | 2026-12-31 |
| NCT06377371Weill Medical College of Cornell UniversityFeasibility of Intraoperative Tracing of Meningioma Using [Cu64]DOTATATE | 2027-01 |
Add all 14 to your calendar (.ics) → With an account.
Among the 129 studies in Meningioma with a site in United States, from their registry updates:
This tab as a report to print or save as PDF → With an account.
This research study is studying a drug as a possible treatment for High Grade Meningioma.
The drug involved in this study is an immunotherapy drug called pembrolizumab
This research study is a Phase II clinical trial. Phase II clinical trials test the safety and effectiveness of an investigational drug to learn whether the drug works in treating a specific disease. "Investigational" means that the drug is being studied.
The FDA (the U.S. Food and Drug Administration) has not approved pembrolizumab for this specific disease but it has been approved for other uses.
In this research study, the investigators are studying pembrolizumab in participants with meningioma. Research studies have shown that meningioma tumor cells express a gene called PD-L1. The investigators will be looking to determine whether the study drug may may stop meningioma tumors from growing.
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.
-Documentation Of Disease
--Histologic Documentation: proven recurrent or residual intracranial or meningioma or meningioma with extracranial spread
Progressive OR residual disease, as defined by the following:
Post radiation patients: Patients with measurable and progressive meningioma who have received radiation are potentially eligible, but need to show evidence of progressive disease in the radiated field after completion of radiation. At least 24 weeks must have elapsed from completion of radiation to registration. Patients that have progressive disease outside of the radiation field do not need to wait 24 weeks from completion of radiation.
Prior Treatment
No craniotomy within 28 days of registration.
≥9 g/dL or ≥5.6 mmol/L without transfusion or EPO dependency (within 7 days of assessment)
-Renal
Measured or calculated ( can also be used in place of creatinine or CrCl) ≤1.5 X (ULN) OR
≥60 mL/min for subject with creatinine levels > 1.5 X institutional ULN
Activated Partial Thromboplastin Time (aPTT) ≤1.5 X ULN unless subject is receiving anticoagulant therapy as long as PT or PTT is within therapeutic range of intended use of anticoagulants
≤1.5 X ULN unless subject is receiving anticoagulant therapy as long as PT or PTT is within therapeutic range of intended use of anticoagulants
Creatinine clearance should be calculated per institutional standard.
Exclusion Criteria:
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.
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.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
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.
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.
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
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.
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 number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Blood tests of how long blood takes to clot. The INR is the prothrombin time (PT) put on a common scale; about 1 is usual for someone not taking a blood thinner.
Criteria often make an exception for people on a blood thinner such as warfarin, whose INR is raised on purpose.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
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.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
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.
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.
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
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.
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.
Measurable disease
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
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.
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.
Postmenopausal
Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).
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.
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.
Absolute neutrophil count (ANC)
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hemoglobin (Hb)
The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Creatinine clearance (CrCl)
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
GFR and eGFR (kidney filtering)
GFR (glomerular filtration rate) is how much blood the kidneys filter each minute. It is usually estimated from a blood test — eGFR, by formulas such as CKD-EPI or MDRD — and some studies ask for it to be measured directly instead. Usually given in mL/min/1.73 m².
Check the method, the units and the minimum the study states. A value of 90 or above is in the normal-or-high range, but kidney damage can show in other tests too.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
INR, PT and aPTT (clotting tests)
Blood tests of how long blood takes to clot. The INR is the prothrombin time (PT) put on a common scale; about 1 is usual for someone not taking a blood thinner.
Criteria often make an exception for people on a blood thinner such as warfarin, whose INR is raised on purpose.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Excipients
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
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.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
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.
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.
Live vaccines
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
* Pembrolizumab will be administered every 3 weeks * Pembrolizumab will be administered through IV infusion
Drug: Pembrolizumab
pembrolizumab binds to PD-1, an inhibitory signaling receptor expressed on the surface of activated T cells, and blocks the binding to and activation of PD-1 by its ligands, which results in the activation of T-cell-mediated immune responses against tumor cells
Also known as: Keytruda
Progression-free Survival at 6 Months (PFS6)
Progression-free survival at 6 months is defined as not having disease progression per RANO (response assessment in neuro-oncology) criteria or death from any cause within six months of the first day of treatment with pembrolizumab. Contrast-enhanced cranial magnetic resonance imaging (MRI) was performed every 6 weeks to assess patient response to treatment. Progressive disease is defined per RANO criteria as the appearance of a new lesion, an increase in the size of a patient's existing lesions, or clear clinical worsening (seizures, medication side effects, complications of therapy, cerebrovascular events, infection, etc.)
Time frame: up to 6 months
Overall Survival (OS)
OS is defined as the time from protocol registration until death due to any cause. The follow-up of patients who were alive at the time of analysis was censored at the date of last assessment of vital status. 90% confidence intervals for median OS were estimated using log(-log(survival)) methodology.
Time frame: Up to 35 months
Overall Survival (OS) at 3 Months
OS benchmarked at 3 months measures the percentage of participants who are still alive at 3 months, after study registration and receiving study therapy.
Time frame: 3 months
Overall Survival (OS) at 6 Months
OS benchmarked at 6 months measures the percentage of participants who are still alive at 6 months, after study registration and receiving study therapy.
Time frame: 6 months
Percentage of Participants With Treatment-related Adverse Events
All adverse events (AEs) recorded during the trial were summarized for all patients who received one or more doses of pembrolizumab. This outcome measure includes adverse events assessed as at least possibly related to study therapy and grade 3 or higher according to Common Terminology Criteria for Adverse Events (CTCAE) version 4.
Time frame: Up to 26 months
Number of Participants With Intracranial Response
Intracranial response is defined as complete response (CR), partial response (PR), or stable disease (SD) by RANO (response assessment for neuro-oncology) criteria. Intracranial response was assessed by contrast-enhanced cranial magnetic resonance imaging (MRI) every 6 weeks. CR: complete disappearance of all enhancing measurable and non-measurable disease sustained for 4+ weeks, no new lesions, stable/decreasing corticosteroids, and patient is stable and improved clinically. Participants with non-measurable disease cannot have a CR; the best possible response is SD. PR: greater than or equal to 50% decrease compared to baseline in the sum of products of perpendicular diameters of all measurable enhancing lesions sustained for 4+ weeks, no progression of non-measurable disease, no new lesions, stable/decreasing corticosteroids, and patient is stable or improved clinically. SD: does not qualify for CR, PR, or disease progression and patient is stable clinically.
Time frame: Up to 25 months
| Milestone | Pembrolizumab |
|---|---|
| Started | 26 |
| Completed | 25 |
| Not completed | 1 |
| Withdrew: Withdrawal by subject | 1 |
Progression-free survival at 6 months is defined as not having disease progression per RANO (response assessment in neuro-oncology) criteria or death from any cause within six months of the first day of treatment with pembrolizumab. Contrast-enhanced cranial magnetic resonance imaging (MRI) was performed every 6 weeks to assess patient response to treatment. Progressive disease is defined per RANO criteria as the appearance of a new lesion, an increase in the size of a patient's existing lesions, or clear clinical worsening (seizures, medication side effects, complications of therapy, cerebrovascular events, infection, etc.)
| percent of participants | Pembrolizumab |
|---|---|
| Progression-free Survival at 6 Months (PFS6) | 48 (31 to 66) |
OS is defined as the time from protocol registration until death due to any cause. The follow-up of patients who were alive at the time of analysis was censored at the date of last assessment of vital status. 90% confidence intervals for median OS were estimated using log(-log(survival)) methodology.
| months | Pembrolizumab |
|---|---|
| Overall Survival (OS) | 20.2 (14.8 to 25.8) |
OS benchmarked at 3 months measures the percentage of participants who are still alive at 3 months, after study registration and receiving study therapy.
| percentage of participants | Pembrolizumab |
|---|---|
| Overall Survival (OS) at 3 Months | 92 (77 to 97) |
OS benchmarked at 6 months measures the percentage of participants who are still alive at 6 months, after study registration and receiving study therapy.
| percent of patients | Pembrolizumab |
|---|---|
| Overall Survival (OS) at 6 Months | 84 (67 to 93) |
All adverse events (AEs) recorded during the trial were summarized for all patients who received one or more doses of pembrolizumab. This outcome measure includes adverse events assessed as at least possibly related to study therapy and grade 3 or higher according to Common Terminology Criteria for Adverse Events (CTCAE) version 4.
| Participants | Pembrolizumab |
|---|---|
| Percentage of Participants With Treatment-related Adverse Events | 20 |
Intracranial response is defined as complete response (CR), partial response (PR), or stable disease (SD) by RANO (response assessment for neuro-oncology) criteria. Intracranial response was assessed by contrast-enhanced cranial magnetic resonance imaging (MRI) every 6 weeks. CR: complete disappearance of all enhancing measurable and non-measurable disease sustained for 4+ weeks, no new lesions, stable/decreasing corticosteroids, and patient is stable and improved clinically. Participants with non-measurable disease cannot have a CR; the best possible response is SD. PR: greater than or equal to 50% decrease compared to baseline in the sum of products of perpendicular diameters of all measurable enhancing lesions sustained for 4+ weeks, no progression of non-measurable disease, no new lesions, stable/decreasing corticosteroids, and patient is stable or improved clinically. SD: does not qualify for CR, PR, or disease progression and patient is stable clinically.
| Participants | Pembrolizumab |
|---|---|
| Complete Response | 0 |
| Partial Response | 0 |
| Stable Disease | 18 |
Collected over up to 3 years. Non-serious events are listed at a 0% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| Pembrolizumab | 15/25 (60%) | 10/25 (40%) | 25/25 (100%) |
| Event | Pembrolizumab |
|---|---|
| ConfusionPsychiatric disorders | 2/25 |
| Generalized Muscle weaknessMusculoskeletal and connective tissue disorders | 2/25 |
| HeadacheNervous system disorders | 2/25 |
| Skin/subcutaneous tissue disorders - Other, specifySkin and subcutaneous tissue disorders | 1/25 |
| SeizureNervous system disorders | 1/25 |
| ColitisGastrointestinal disorders | 1/25 |
| Urinary IncontinenceRenal and urinary disorders | 1/25 |
| Thromboembolic eventVascular disorders | 1/25 |
| Skin infectionInfections and infestations | 1/25 |
| EncephalopathyNervous system disorders | 1/25 |
| Event | Pembrolizumab |
|---|---|
| FatigueGeneral disorders | 12/25 |
| FallInjury, poisoning and procedural complications | 10/25 |
| ConstipationGastrointestinal disorders | 8/25 |
| AnemiaBlood and lymphatic system disorders | 7/25 |
| Cholesterol HighInvestigations | 7/25 |
| Gait disturbanceGeneral disorders | 7/25 |
| HyperglycemiaMetabolism and nutrition disorders | 7/25 |
| HypophosphatemiaMetabolism and nutrition disorders | 7/25 |
| InsomniaPsychiatric disorders | 7/25 |
| Investigations - Other, specifyInfections and infestations | 7/25 |
| Age, Continuous(years) | Pembrolizumab |
|---|---|
| Mean | 60.9 ± 16.5 |
| Sex: Female, Male(Participants) | Pembrolizumab |
|---|---|
| Female | 11 |
| Male | 14 |
| Ethnicity (NIH/OMB)(Participants) | Pembrolizumab |
|---|---|
| Hispanic or Latino | 1 |
| Not Hispanic or Latino | 21 |
| Unknown or Not Reported | 3 |
| Race (NIH/OMB)(Participants) | Pembrolizumab |
|---|---|
| American Indian or Alaska Native | 0 |
| Asian | 0 |
| Native Hawaiian or Other Pacific Islander | 0 |
| Black or African American | 3 |
| White | 19 |
| More than one race | 1 |
| Unknown or Not Reported | 2 |
PDFs hosted by the registry, ClinicalTrials.gov.
Plan to share: No
Ran from Nov 2017 to primary completion in Sep 2021, 46 months.
Results were first posted in Jun 2023, 1 year 8 months after primary completion.
Of 37 phase 2 interventional studies under Meningioma, half reached primary completion within 62 months of starting (the median), counting those still running; a quarter within 41 and three quarters within 108. This study's 46 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 ↗
This study is active, not recruiting, as verified in Oct 2026. You cannot join it, but the record below documents what was studied.
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Studies of the drug tested here: Pembrolizumab
Massachusetts General Hospital →