A Phase 1/2 interventional study of Anetumab Ravtansine and Laboratory Biomarker Analysis in Pleural Malignant Mesothelioma, sponsored by National Cancer Institute (NCI). Active, not recruiting at 33 sites in 2 countries. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-04-01.
Sponsored by National Cancer Institute (NCI) · Phase 1/2, Interventional, and Treatment
This phase I/II trial studies the side effects and how well pembrolizumab with or without anetumab ravtansine works in treating patients with mesothelin-positive pleural mesothelioma. Anetumab ravtansine is a monoclonal antibody, called anetumab, linked to a chemotherapy drug, called ravtansine. Anetumab is a form of targeted therapy because it attaches to specific molecules (receptors) on the surface of cancer cells, known as mesothelin receptors, and delivers ravtansine to kill them. Immunotherapy with monoclonal antibodies, such as pembrolizumab, may help the body's immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Giving pembrolizumab and anetumab ravtansine may work better in treating patients with mesothelin-positive pleural mesothelioma.
PRIMARY OBJECTIVES:
I. Determine the dose of anetumab ravtansine that is safe in combination with pembrolizumab to be used in the randomized phase 2 study. (Phase I safety lead-in) II. Determine if the overall response rate of the combination of anetumab ravtansine and pembrolizumab is superior to pembrolizumab alone. (Phase II)
SECONDARY OBJECTIVES:
I. To determine the progression free survival of anetumab ravtansine and pembrolizumab compared to pembrolizumab alone.
II. To evaluate the pharmacodynamic effects of anetumab ravtansine and pembrolizumab on soluble megakaryocyte potentiating factor (MPF).
III. To evaluate the pharmacokinetics of anetumab ravtansine and pembrolizumab. IV. To evaluate mononuclear phagocyte system (MPS) function, FcgammaRs, hormone and chemokine mediators as methods to evaluate factors affecting the pharmacokinetics and pharmacodynamics of these agents.
V. To determine the incidence of antibodies directed against anetumab ravtansine.
CORRELATIVE STUDY OBJECTIVES:
I. To determine whether elevations in Bim in tumor-reactive T cells (TTR) predict responses to treatment and whether its detection is dynamic with treatment.
II. To determine whether soluble PD-L1 predicts responses to treatment and whether its detection is dynamic with treatment.
III. To evaluate PD-L1 expression in archival tissue as a predictive marker of response to pembrolizumab-based therapy.
IV. To explore the symptomatic adverse events (AE) for tolerability of each treatment group using Patient Reported Outcomes (PRO)-Common Terminology Criteria for Adverse Events (CTCAE).
OUTLINE: Patients are randomized to 1 of 2 groups.
GROUP I: Patients receive pembrolizumab intravenously (IV) over 30 minutes on day 1. Cycles repeat every 21 days for up to 24 months in the absence of disease progression or unacceptable toxicity. Upon radiologic documentation of disease progression, patients may cross over to Group II.
GROUP II: Patients receive anetumab ravtansine IV over 1 hour and pembrolizumab IV over 30 minutes on day 1. Cycles repeat every 21 days for up to 12 months for anetumab ravtansine and up to 24 months for pembrolizumab in the absence of disease progression or unacceptable toxicity.
After completion of study treatment, patients are followed up for 12 months.
409 studies on the registry are indexed under Mesothelioma, Malignant; 71 are open to participants now.
This study's enrollment of 49 is above the median of 37 across 329 interventional studies indexed under Mesothelioma, Malignant.
Browse Mesothelioma, Malignant studies →National Cancer Institute (NCI) is the lead sponsor of 3,506 studies on the registry; 334 are open to participants now.
Of its 402 completed or terminated interventional studies of FDA-regulated products, 365 (91%) have results posted.
Counted across the registry records on this site, refreshed daily.
Patient is willing to submit a tissue sample to test for expression of mesothelin
Patient has measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 for non-pleural disease or modified RECIST 1.1 (mRECIST) for pleural disease
Negative serum pregnancy test for females of child bearing potential
Patient agrees to use one of the following acceptable methods of contraception prior to study entry, during study participation, and for at least six months after receiving the last dose of study treatment:
Acceptable methods of contraception are:
Single method (1 of the following is acceptable):
Combination method (requires use of 2 of the following):
Exclusion Criteria:
Patients who have not recovered from adverse events due to prior anti-cancer therapy (i.e., have residual toxicities > grade 1)
Patients with known brain metastases with progressive neurologic dysfunction, requirement of steroids and lack of improvement on head imaging obtained prior to consent to this clinical trial should be excluded because of their poor prognosis and because they would confound the evaluation of neurologic and other adverse events
Patients are prohibited from receiving the following therapies during the screening and treatment phases (including retreatment for post-complete response relapse) of this trial:
Women who are pregnant or breastfeeding.
Human immunodeficiency virus (HIV)-positive patients who do not meet all of the following and/or are on HIV medications considered to be strong inhibitors or inducers of CYP3A4:
Has a known history of hepatitis B (defined as hepatitis B surface antigen [HBsAg] reactive) or known active hepatitis C virus (defined as HCV ribonucleic acid [RNA] [qualitative] is detected) infection
Patients receive pembrolizumab IV over 30 minutes on day 1. Cycles repeat every 21 days for up to 24 months in the absence of disease progression or unacceptable toxicity. Upon radiologic documentation of disease progression, patients may cross over to Group II.
Other: Laboratory Biomarker Analysis · Biological: Pembrolizumab · Other: Pharmacological Study
Patients receive anetumab ravtansine IV over 1 hour and pembrolizumab IV over 30 minutes on day 1. Cycles repeat every 21 days for up to 12 months for anetumab ravtansine and up to 24 months for pembrolizumab in the absence of disease progression or unacceptable toxicity.
Biological: Anetumab Ravtansine · Other: Laboratory Biomarker Analysis · Biological: Pembrolizumab · Other: Pharmacological Study
Given IV
Also known as: BAY 94-9343
Correlative studies
Given IV
Also known as: BCD-201, GME 751, GME751, Keytruda, Lambrolizumab, MK 3475, MK-3475, MK3475, Pembrolizumab Biosimilar BCD-201, Pembrolizumab Biosimilar GME751, Pembrolizumab Biosimilar QL2107, Pembrolizumab Biosimilar RPH-075, Pembrolizumab Biosimilar SB27, QL2107, RPH 075, RPH-075, RPH075, SB 27, SB-27, SB27, SCH 900475, SCH-900475, SCH900475
Correlative studies
Phase 2 Confirmed Tumor Response Rate (Phase II)
Will be assessed using Response Evaluation Criteria in Solid Tumors version 1.1 criteria. The proportion of successes will be estimated in each group by the number of successes divided by the total number of evaluable patients. Confidence intervals for the true success proportion will be calculated in each arm. Comparison of confirmed response rates between the two treatment groups will be performed using a one-sided z-test with pooled variance at significance level 0.10. Per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0) for target lesions and assessed by MRI: Complete Response (CR), Disappearance of all target lesions; Partial Response (PR), \>=30% decrease in the sum of the longest diameter of target lesions; Overall Response (OR) = CR + PR.
Time frame: Up to 2 years
Phase I - Recommended Phase 2 Dose of Ametumab Ravtansine With Combination of Pembrolizumab
All patients that have received any amount of the combination anetumab ravtansine and pembrolizumab will be evaluable for toxicity. Please note this is different from the definition of evaluable for dose-limiting toxicity (DLT) where patients who cannot complete the planned dose due to reasons other than toxicity will be replaced.
Time frame: Up to 2 years
Phase 2 Duration of Response
Will be defined as evaluable patients who achieved noted to be a partial response or complete response based Response Evaluation Criteria in Solid Tumors version 1.1 criteria. Will be estimated using the method of Kaplan-Meier. The comparison of duration of response between two treatment arms will be based on the log-rank test. This calculation will start with the date of start of treatment.
Time frame: Up to 2 years
Phase 2 Overall Survival
Will be estimated using the method of Kaplan-Meier. The comparison of overall survival in event of death between two treatment arms will be based on the log-rank test.
Time frame: From the start of treatment to death due to any cause, assessed up to 2 years
Phase 2 Progression Free Survival
Will be estimated using the method of Kaplan-Meier. The comparison of progression-free survival between two treatment arms will be based on the log-rank test. Progression is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0), as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions
Time frame: From the start of treatment to the earliest date of documentation of disease progression or death due to any cause, assessed up to 2 years
Pharmacokinetics of Anetumab Ravtansine
Will be largely descriptive. Changes over time will be plotted and assessed for each patient.
Time frame: Days 1 and 3 of courses 1 and 8
Change in Megakaryocyte Potentiating Factor Levels Assessed in Tumor
Relative changes in biomarker levels will be compared by best overall response groups using the non-parametric Wilcoxon rank-sum test. Also, the associations between changes in megakaryocyte potentiating factor levels and ordered response categories (i.e. complete response-partial response-stable disease-progressive disease) will be assessed with the Jonckheere-Terpstra test for trend.
Time frame: Baseline up to 2 years
Mononuclear Phagocyte System -FcgammaRs and Chemokine Mediators of Mononuclear Phagocyte System
The mean equivalent soluble fluorophore and antibody bound to cell (ABC) will be determined for each specimen. Linear regression will be used to explore the linear relationship between the continuous values of these mononuclear phagocyte system-FcgammaRs probes and anetumab ravtansine levels. The concentrations of CCL2 and CCL5 will be determined for each specimen. Linear regression will be used to explore the linear relationship between the continuous values of these chemokines and anetumab ravtansine levels.
Time frame: Up to 2 years
Incidence of Adverse Events
To explore the symptomatic adverse events (AE) for tolerability of each treatment group using Patient Reported Outcomes (PRO)-Common Terminology Criteria for Adverse Events (CTCAE).
Time frame: Up to 2 years
| Milestone | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort Dose Level 1 |
|---|---|---|---|
| Started | 18 | 18 | 13 |
| Completed | 18 | 17 | 13 |
| Not completed | 0 | 1 | 0 |
Will be assessed using Response Evaluation Criteria in Solid Tumors version 1.1 criteria. The proportion of successes will be estimated in each group by the number of successes divided by the total number of evaluable patients. Confidence intervals for the true success proportion will be calculated in each arm. Comparison of confirmed response rates between the two treatment groups will be performed using a one-sided z-test with pooled variance at significance level 0.10. Per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0) for target lesions and assessed by MRI: Complete Response (CR), Disappearance of all target lesions; Partial Response (PR), \>=30% decrease in the sum of the longest diameter of target lesions; Overall Response (OR) = CR + PR.
| Participants | Group I (Pembrolizumab) | Group II (Anetumab Ravtansine, Pembrolizumab) |
|---|---|---|
| NE | 2 | 4 |
| PD (Preliminary) | 6 | 2 |
| PD (Confirmed) | 3 | 1 |
| SD | 5 | 9 |
| PR (Confirmed) | 1 | 2 |
All patients that have received any amount of the combination anetumab ravtansine and pembrolizumab will be evaluable for toxicity. Please note this is different from the definition of evaluable for dose-limiting toxicity (DLT) where patients who cannot complete the planned dose due to reasons other than toxicity will be replaced.
| mg/kg IV | Phase 1 Cohort: Anetumab Ravtansine & MK-3475 |
|---|---|
| Phase I - Recommended Phase 2 Dose of Ametumab Ravtansine With Combination of Pembrolizumab | 6.5 |
Will be defined as evaluable patients who achieved noted to be a partial response or complete response based Response Evaluation Criteria in Solid Tumors version 1.1 criteria. Will be estimated using the method of Kaplan-Meier. The comparison of duration of response between two treatment arms will be based on the log-rank test. This calculation will start with the date of start of treatment.
No measurements were reported for this outcome.
Will be estimated using the method of Kaplan-Meier. The comparison of overall survival in event of death between two treatment arms will be based on the log-rank test.
| Participants | Group I (Pembrolizumab) | Group II (Anetumab Ravtansine, Pembrolizumab) |
|---|---|---|
| Phase 2 Overall Survival | 0 | 2 |
Will be estimated using the method of Kaplan-Meier. The comparison of progression-free survival between two treatment arms will be based on the log-rank test. Progression is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0), as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions
| Participants | Group I (Pembrolizumab) | Group II (Anetumab Ravtansine, Pembrolizumab) |
|---|---|---|
| Phase 2 Progression Free Survival | 10 | 9 |
Will be largely descriptive. Changes over time will be plotted and assessed for each patient.
Results for this outcome have not been posted.
Relative changes in biomarker levels will be compared by best overall response groups using the non-parametric Wilcoxon rank-sum test. Also, the associations between changes in megakaryocyte potentiating factor levels and ordered response categories (i.e. complete response-partial response-stable disease-progressive disease) will be assessed with the Jonckheere-Terpstra test for trend.
Results for this outcome have not been posted.
The mean equivalent soluble fluorophore and antibody bound to cell (ABC) will be determined for each specimen. Linear regression will be used to explore the linear relationship between the continuous values of these mononuclear phagocyte system-FcgammaRs probes and anetumab ravtansine levels. The concentrations of CCL2 and CCL5 will be determined for each specimen. Linear regression will be used to explore the linear relationship between the continuous values of these chemokines and anetumab ravtansine levels.
Results for this outcome have not been posted.
To explore the symptomatic adverse events (AE) for tolerability of each treatment group using Patient Reported Outcomes (PRO)-Common Terminology Criteria for Adverse Events (CTCAE).
Results for this outcome have not been posted.
Collected over Up to 2 years. Non-serious events are listed at a 0% frequency threshold.
| Group | Deaths | Serious | Other |
|---|---|---|---|
| Phase 2 Group I (Pembrolizumab) | 1/17 (5.9%) | 1/17 (5.9%) | 17/17 (100%) |
| Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | 2/18 (11.1%) | 2/18 (11.1%) | 18/18 (100%) |
| Phase 1 Cohort DLT 1 | 1/13 (7.7%) | 1/13 (7.7%) | 13/13 (100%) |
| Event | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1 |
|---|---|---|---|
| Neoplasms benign, mal, uncpec - Oth specNeoplasms benign, malignant and unspecified (incl cysts and polyps) | 1/17 | 0/18 | 1/13 |
| Death NOSGeneral disorders | 0/17 | 1/18 | 0/13 |
| Gen disord and admin site conds-Oth specGeneral disorders | 0/17 | 1/18 | 0/13 |
| Event | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1 |
|---|---|---|---|
| NauseaGastrointestinal disorders | 3/17 | 13/18 | 6/13 |
| FatigueGeneral disorders | 8/17 | 12/18 | 9/13 |
| Aspartate aminotransferase increasedInvestigations | 4/17 | 11/18 | 8/13 |
| DiarrheaGastrointestinal disorders | 4/17 | 11/18 | 7/13 |
| AnemiaBlood and lymphatic system disorders | 7/17 | 7/18 | 7/13 |
| Alanine aminotransferase increasedInvestigations | 3/17 | 7/18 | 7/13 |
| Alkaline phosphatase increasedInvestigations | 4/17 | 9/18 | 7/13 |
| AnorexiaMetabolism and nutrition disorders | 2/17 | 5/18 | 7/13 |
| HypoalbuminemiaMetabolism and nutrition disorders | 7/17 | 9/18 | 5/13 |
| Peripheral sensory neuropathyNervous system disorders | 1/17 | 9/18 | 4/13 |
| Age, Continuous(years) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| Median | 70.0 (46.0 to 85.0) | 67.5 (23.0 to 88.0) | 72 (48 to 81) | 68.0 (23.0 to 88.0) |
| Sex: Female, Male(Participants) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| Female | 6 | 6 | 4 | 16 |
| Male | 11 | 12 | 9 | 32 |
| Ethnicity (NIH/OMB)(Participants) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| Hispanic or Latino | 0 | 1 | 1 | 2 |
| Not Hispanic or Latino | 16 | 17 | 5 | 38 |
| Unknown or Not Reported | 1 | 0 | 7 | 8 |
| Race (NIH/OMB)(Participants) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| American Indian or Alaska Native | 0 | 0 | 0 | 0 |
| Asian | 2 | 2 | 0 | 4 |
| Native Hawaiian or Other Pacific Islander | 0 | 0 | 0 | 0 |
| Black or African American | 0 | 0 | 0 | 0 |
| White | 14 | 16 | 11 | 41 |
| More than one race | 0 | 0 | 0 | 0 |
| Unknown or Not Reported | 1 | 0 | 2 | 3 |
| Histologic Grade(Participants) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| Borderline malignancy | 0 | 1 | 0 | 1 |
| Grade cannot be assessed | 10 | 8 | 7 | 25 |
| Poorly Differentiated | 1 | 1 | 1 | 3 |
| Well Differentiated | 1 | 0 | 0 | 1 |
| Missing | 5 | 8 | 5 | 18 |
| Disease Stage(Participants) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| Stage IA | 2 | 0 | 0 | 2 |
| Stage IB | 3 | 0 | 0 | 3 |
| Stage II | 0 | 1 | 1 | 2 |
| Stage III | 1 | 2 | 0 | 3 |
| Stage IIIB | 0 | 5 | 1 | 6 |
| Stage IV | 8 | 8 | 6 | 22 |
| Missing | 3 | 2 | 5 | 10 |
| Weight(kg) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| Mean | 77.2 (48.8 to 100.2) | 80.1 (53.2 to 108.0) | 85.0 (51.8 to 173) | 80.4 (48.8 to 173) |
| Height(cm) | Phase 2 Group I (Pembrolizumab) | Phase 2 Group II (Anetumab Ravtansine, Pembrolizumab) | Phase 1 Cohort DLT 1: Anetumab Ravtansine & MK-3475 | Total |
|---|---|---|---|---|
| Mean | 168.4 (152.8 to 188.0) | 173.1 (152.0 to 188.0) | 167.3 (90.9 to 196) | 169.2 (90.9 to 196) |
2 further baseline measures are reported on the registry.
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National Cancer Institute (NCI)