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A Phase II Clinical Trial to Evaluate Safety and Efficacy of XmAb20717 in Advanced Rare Cancers

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT05337735
Recruitment Status : Recruiting
First Posted : April 20, 2022
Last Update Posted : September 21, 2023
Information provided by (Responsible Party):
M.D. Anderson Cancer Center

Brief Summary:
To test the safety of and effectiveness of XmAb20717 for participants with advanced rare cancers.

Condition or disease Intervention/treatment Phase
Microsatellite High Cancers Peritoneal Mesothelioma Extrapulmonary High Grade Neuroendocrine Carcinomas Cervical Carcinoma Hodgkin's Lymphoma Pleural Mesothelioma Small Cell Lung Cancer Drug: XmAb20717 Phase 2

Detailed Description:

Primary Objective:

Efficacy of XmAb20717 as defined by objective response (defined as a complete response [CR] or partial response [PR] on two consecutive occasions ≥4 weeks apart) as determined by an independent radiologist according to RECIST v1.1 (modified RECIST for pleural mesothelioma)

Secondary Objectives:

  1. Objective response as determined by an independent radiologist according to immune-modified RECIST
  2. Progression-free survival (PFS) (defined as the time from enrollment to the first occurrence of disease progression or death from any cause, whichever occurs first) as determined by an independent radiologist according to RECIST v1.1 (modified RECIST for pleural mesothelioma).
  3. Duration of response (DoR) (defined as the time from the first occurrence of a documented objective response to disease progression or death from any cause, whichever occurs first) as determined by an independent radiologist according to RECIST v1.1 (modified RECIST for pleural mesothelioma)
  4. Disease control as determined by an independent radiologist according to RECIST v1.1 (modified RECIST for pleural mesothelioma)
  5. Overall survival (OS) (defined as the time from enrollment to death from any cause)
  6. PFS as determined by an independent radiologist according to immune-modified RECIST
  7. DoR as determined by an independent radiologist according to immune-modified RECIST
  8. Disease control as determined by an independent radiologist according to immune-modified RECIST
  9. Occurrence and severity of AEs, with severity determined according to National Cancer Institute Common Terminology Criteria for Adverse Events, version 5.0

Exploratory Objective

To identify biomarkers that are predictive of response and/or are associated with progression to a more severe disease state (i.e., prognostic biomarkers).

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 140 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase II Clinical Trial to Evaluate Safety and Efficacy of XmAb20717 in Advanced Rare Cancers
Actual Study Start Date : August 5, 2022
Estimated Primary Completion Date : April 1, 2024
Estimated Study Completion Date : April 1, 2024

Arm Intervention/treatment
Experimental: XmAb20717
Participants will receive XmAb20717 by vein over 1 hour on Days 1 and 15 of each cycle.
Drug: XmAb20717
Given by vein (IV)

Primary Outcome Measures :
  1. To establish the efficacy of XmAb20717 as measured by overall response rate. [ Time Frame: through study completion, an average of 1 year ]
    Number of Participants With Objective Radiographic response as Assessed by RECIST v.1.1

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Study Participant Inclusion Criteria

Inclusion Criteria:

  1. Is able to complete signed informed consent
  2. Is of age ≥ 18
  3. Is able, in the investigator's judgment, to comply with the study protocol
  4. Has measurable disease according to RECIST v1.1 The pleural mesothelioma cohort will require measurable disease according to either modified RECIST or RECIST; the Hodgkin lymphoma patients will be assessed by the 2014 Lugano criteria (see Appendix F)
  5. Has an ECOG performance status of 0 - 1
  6. Has adequate hematologic and end-organ function, defined by the following laboratory test results, obtained within 14 days prior to initiation of study treatment:

    • ANC ≥ 1.0×109/L without granulocyte colony-stimulating factor support
    • Lymphocyte count ≥ 0.5×109/L
    • Platelet count ≥ 100× 109/L without transfusion
    • Hemoglobin ≥ 90 g/L (For platelet count and hemoglobin, patients may be transfused to meet either criterion but not within 14 days prior to initiation of study treatment)
    • Aspartate aminotransferase (AST), alanine aminotransferase (ALT), and alkaline phosphatase (ALP) ≤ 2.5× upper limit of normal (ULN), with the following exceptions:

    Patients with documented liver metastases: AST and ALT ≤ 5×ULN Patients with documented liver or bone metastases: ALP ≤ 5×ULN

    o Serum bilirubin ≤ 1.5 ×ULN with the following exception: Patients with known Gilbert disease: serum bilirubin level ≤ 3 ×ULN

    • Serum creatinine ≤ 1.5 mg/dL OR calculated creatinine clearance (Cockcroft-Gault formula) ≥50 mL/min OR 24-hour urine creatinine clearance ≥50 mL/min
    • Serum albumin ≥ 2.5 g/dL
    • For patients not receiving therapeutic anticoagulation: INR or aPTT ≤ 1.5×ULN
    • For patients receiving therapeutic anticoagulation: is on a stable anticoagulant regimen without changes in agent and / or dose in the past 30 days
  7. Must agree to use a highly effective method of birth control (as defined in Section 7.4.1) (female patients and male patients with female partners of childbearing potential) during and for 6 months after last dose of study treatment. Also see related information in Section

Basket-specific Inclusion Criteria:

  1. Peritoneal Mesothelioma: Has advanced MPeM that was previously treated with and refractory/intolerant to platinum-pemetrexed systemic chemotherapy or has not received treatment and is ineligible for platinum-pemetrexed treatment
  2. Pleural Mesothelioma: Has unresectable MPM and is treatment naïve or has received any line of prior therapy, including anti-PD1/anti-PDL1.
  3. High-grade Neuroendocrine Carcinoma: Has extra-pulmonary site carcinoma (small-cell- and large-cell lung cancer excluded) and has received therapy with a platinum-based chemotherapy regimen
  4. MSI-H Cancers: Has not had anti-PD1 / anti-PDL1 / anti-CLTA4 therapy, non-colorectal- or colorectal- (the latter limited to ≤ 25% of total accrual) MSI-H/dMMR, locally advanced or metastatic solid tumors. Locally advanced solid tumors are defined by having ≥20% chance of recurrence with surgery alone. Patients with localized solid tumors are also eligible if they have a high risk for surgical mortality defined as >5% by ACS National Surgery Quality Improvement Program. Patients being treated with neoadjuvant intent may be treated for up to 6 months prior to surgical resection, though in patients with clear clinical benefit as deemed by treating physicians, a non-operative approach-treatment duration ≥ 6 months (and up to 2 years)-may be considered.

    Note: ASC = American College of Surgeons, MSI-H = microsatellite instability-high, dMMR = deficient mismatch repair.

  5. Lymphoma: Has relapsed, refractory classical Hodgkin lymphoma and has received first-line chemotherapy
  6. Cervical Cancer: Has recurrent, metastatic, or persistent cervical cancer (squamous cell carcinoma, adenosquamous, or adenocarcinoma of the cervix) which has not been treated with systemic therapy (except as part of chemoradiation) and not amenable to curative treatment.
  7. Small-cell lung cancer: Extensive-stage small-cell lung cancer following treatment with prior platinum-based therapy, which can include prior anti-PD1, anti-PDL1, but not anti-CTLA4.

Study Participant Exclusion Criteria:

Participants who meet any of the following criteria will be excluded from the study:

  1. Received treatment for the studied cancer within 21 days prior to initiation of study treatment
  2. Received treatment with targeted therapies or investigational therapies within 21 days or for the duration of 5 half-lives prior to initiation of study treatment
  3. Has a history of severe allergic, anaphylactic, or other hypersensitivity reactions to study drug
  4. Has active known- or suspected autoimmune disease (allowed are patients with vitiligo; type 1 diabetes mellitus, or residual hypothyroidism due to an autoimmune condition that is treatable with hormone-replacement therapy only; psoriasis, atopic dermatitis, or another autoimmune skin condition that is managed without systemic therapy; or arthritis that is managed without systemic therapy beyond oral acetaminophen and non-steroidal anti-inflammatory drugs).
  5. Has any condition that requires systemic treatment with corticosteroids, prednisone equivalents, or other immunosuppressive medications within 14 days prior to first dose of study drug (except that inhaled or topical corticosteroids or brief courses of corticosteroids given for prophylaxis of contrast dye allergic response are permitted).
  6. Has a history or evidence of any other clinically unstable/uncontrolled disorder, condition, or disease (including, but not limited to, cardiopulmonary-, renal-, metabolic-, hematologic-, or psychiatric-) other than their primary malignancy, that in the opinion of the Investigator would pose a risk to patient safety or interfere with study evaluations, procedures, or completion.
  7. Has had any serious bacterial, viral, parasitic, or systemic fungal infections within 14 days prior to the first dose of study drug.
  8. Received prior treatment with any checkpoint-inhibitor therapy regimen that targets PD1/PDL1 or CTLA-4 (this does not apply to candidates for the pleural mesothelioma or SCLC cohorts-see basket-specific inclusion criteria).
  9. Received a live-virus vaccine within 30 days prior to first dose of study drug (vaccines that do not contain live virus are permitted).
  10. Has another malignancy, except for non-melanoma skin cancer, in situ cervical cancer, or bladder cancer (Tis and T1) that has been adequately treated during the 3 years prior to screening (Note: For MSI-H cohort, prior history of malignancies are allowed unless this may be a competing risk for mortality while on study per the investigator).
  11. Has untreated or unstable brain metastases. Allowed are those with known brain metastases who have been previously treated and are asymptomatic. If prior local therapy was received, it must have been completed at least 14 days prior to receiving study drug.
  12. Is breastfeeding or plans to initiate breastfeeding during the study treatment or within 6 months of taking study treatment.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT05337735

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Contact: Arvind Dasari, MD (713) 792-2828

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United States, Texas
M D Anderson Cancer Center Recruiting
Houston, Texas, United States, 77030
Contact: Arvind Dasari, MD    713-792-2828   
Principal Investigator: Arvind Dasari, MD         
Sponsors and Collaborators
M.D. Anderson Cancer Center
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Principal Investigator: Arvind, MD M.D. Anderson Cancer Center
Additional Information:
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Responsible Party: M.D. Anderson Cancer Center Identifier: NCT05337735    
Other Study ID Numbers: 2021-0589
NCI-2022-02841 ( Other Identifier: NCI-CTRP-Clinical Trial Reporting Registry )
First Posted: April 20, 2022    Key Record Dates
Last Update Posted: September 21, 2023
Last Verified: September 2023

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Carcinoma, Neuroendocrine
Neuroendocrine Tumors
Small Cell Lung Carcinoma
Mesothelioma, Malignant
Neoplasms, Glandular and Epithelial
Neoplasms by Histologic Type
Carcinoma, Bronchogenic
Bronchial Neoplasms
Lung Neoplasms
Respiratory Tract Neoplasms
Thoracic Neoplasms
Neoplasms by Site
Lung Diseases
Respiratory Tract Diseases
Neoplasms, Mesothelial
Pleural Neoplasms
Neuroectodermal Tumors
Neoplasms, Germ Cell and Embryonal
Neoplasms, Nerve Tissue