Anti-Mesothelin Immunotoxin LMB-100 Followed by Pembrolizumab in Malignant Mesothelioma

    Not Recruiting
  • End date
    Feb 28, 2023
  • participants needed
  • sponsor
    National Cancer Institute (NCI)
Updated on 8 December 2021
ejection fraction
measurable disease
major surgery
neutrophil count
blood transfusion
chemotherapy regimen
urine test
malignant mesothelioma
peritoneal mesothelioma
formalin-fixed paraffin-embedded
pleural mesothelioma



Treatment outcomes for people with pleural or peritoneal mesothelioma are often poor. The drug LMB-100 can attack and kill cancer cells. The drug pembrolizumab helps the immune system fight cancer. Together, these drugs might help people with these cancers.


To test if pembrolizumab given after LMB-100 shrinks tumors in people with pleural or peritoneal mesothelioma.


People ages 18 and older with pleural or peritoneal mesothelioma that has not responded to platinum-based therapy


Participants will be screened with:

Tumor sample. Participants will have a biopsy if one is needed.

Medical history

Physical exam

Blood, heart, and urine tests

X-rays and scans: Participants will lie on a table. A machine will take pictures of the body.

Participants will receive LMB-100 by IV on days 1, 3, and 5 of two 21-day cycles. They will be observed for up to 2 hours after each infusion. They will receive drugs like Benadryl, Tylenol, and Zantac to help with side effects.

Starting with the 3rd cycle, participants will receive pembrolizumab by IV on day 1 of each 21-day cycle for up to 2 years.

Participants will have blood and urine tests, heart tests, and chest x-rays at least once per cycle. They will have scans every 6 weeks.

Participants may opt to provide tumor biopsies before starting the first cycle, after 2 cycles of LMB-100, and after 2 cycles of pembrolizumab.

Participants will a follow-up visit 4-6 weeks after their last drug dose of the study drug. This includes blood and heart tests and scans. They may then have scans every 6 weeks.

Participants will be contacted once a year for follow-up.


  • LMB-100, and a closely related immunotoxin, SS1P, also targeting mesothelin, have been studied in previous Phase 1 clinical studies for mesothelioma and pancreatic cancer.
  • LMB-100 has demonstrated anti-tumor efficacy against several mesothelin expressing tumor models including mesothelioma PDX models
  • PD-1 (encoded by the gene Pdcd1) is an Ig superfamily member related to CD28 and CTLA-4 that has been shown to negatively regulate antigen receptor signaling upon engagement of its ligands
  • The PD-1 receptor-ligand interaction is a major pathway hijacked by tumors to suppress immune control. The normal function of PD-1, expressed on the cell surface of activated T-cells under healthy conditions, is to down-modulate unwanted or excessive immune responses, including autoimmune reactions.
  • In immune-competent mice bearing human mesothelin expressing tumors local administration of LMB-100 with CTLA-4 blockade eradicates murine tumors by promoting anti-cancer immunity.
  • LMB-100 treatment increase CD8+ T cell infiltration in murine lung adenocarcinoma tumors that express human mesothelin.
  • Combination treatment with LMB-100 plus anti-PD1 results in greater anti-tumor efficacy in murine lung cancer model
  • Pembrolizumab is an anti PD-1 antibody that has demonstrated responses of long duration in clinical trials and has generally been well-tolerated
  • It is hypothesized that the anti-mesothelin immunotoxin LMB-100 followed by pembrolizumab will result in greater anti-tumor efficacy in patients with mesothelioma.
  • To determine the objective response rate of sequential therapy with LMB-100 followed by pembrolizumab in subjects with pleural and peritoneal mesothelioma.
  • Histologically confirmed epithelial or biphasic pleural or peritoneal mesothelioma (with <50% sarcomatoid component) not amenable to potentially curative surgical resection.
  • Subjects must have at least one prior chemotherapy regimen that includes pemetrexed and cisplatin or carboplatin.
  • Age greater than or equal to 18 years.
  • ECOG performance status of 0 or 1.
  • Adequate organ and bone marrow function
  • Prior PD1/PD-L1 inhibitor treatment is prohibited
  • Chemotherapy within 4 weeks or radiotherapy within 2 weeks prior to start of study therapy is prohibited.
  • Subjects with active CNS metastasis are excluded
  • Subjects with active autoimmune disease for which they had received systemic treatment during the previous 2 years receiving systemic glucocorticoids (excluding daily glucocorticoid-replacement therapy for conditions such as adrenal or pituitary insufficiency) are excluded
  • Subjects with active interstitial lung disease, or a history of pneumonitis for which they had received glucocorticoids are excluded
  • This is an open-label, single center phase II study of LMB-100 followed by pembrolizumab in subjects with advanced pleural or peritoneal mesothelioma who have progressed on standard therapies.
  • Subjects will receive LMB-100 at the single agent MTD on days 1, 3 and 5 of a 21-day cycle for 2 cycles and pembrolizumab 200 mg on day 1 of each subsequent 21-day cycle until disease progression (on or after pembrolizumab) or intolerable toxicity for a maximum of 2 years (unless second course initiated).
  • Tumor biopsies will be performed at baseline, at the end of cycle 2 and at the end of cycle 4 to evaluate changes in the tumor immune microenvironment following treatment with LMB-100 and pembrolizumab.
  • Up to 35 evaluable subjects will be enrolled

Condition Mesothelioma, Mesothelioma
Treatment Pembrolizumab, LMB-100
Clinical Study IdentifierNCT03644550
SponsorNational Cancer Institute (NCI)
Last Modified on8 December 2021

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