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A Phase 1 Dose-Escalation and Cohort-Expansion of VLS-101 in Hematologic Malignancies

Trial Status: Active

This is a Phase 1 study evaluating the safety, pharmacokinetics, pharmacodynamics, immunogenicity, and efficacy of VLS-101, an antibody-drug conjugate (ADC) that targets receptor tyrosine kinase-like orphan receptor 1 (ROR1) on cancer cells. The study is evaluating VLS-101 in patients with previously treated hematological cancers.

Inclusion Criteria

  • Inclusion: - Men or women of age ≥18 years. - Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2. - Presence of measurable B-cell cancer that has progressed during or relapsed after prior systemic therapy. - Availability of pretreatment tumor tissue. - All acute toxic effects of prior antitumor therapy resolved to Grade ≤1 - Adequate bone marrow function - Adequate hepatic profile - Adequate renal function - Adequate coagulation profile - Negative testing for human immunodeficiency virus (HIV), hepatitis B, and hepatitis C - For female subjects of childbearing potential, a negative serum pregnancy test. - For both male and female subjects, willingness to use adequate contraception - Willingness and ability of the subject to comply with study activities. - Evidence of a personally signed informed consent document. Exclusion Criteria: - Presence of malignancy involving the central nervous system. - Presence of another major cancer. - Significant cardiovascular disease or electrocardiogram (ECG) abnormalities. - Uncontrolled ongoing infection. - Pregnancy or breastfeeding. - Candidacy for hematopoietic stem cell transplantation (HSCT) or chimeric antigen receptor (CAR)-T-cell therapy (based on investigator judgment). - Evidence of graft-versus-host disease (GVHD) with Grade ≥2 serum bilirubin, Grade ≥3 skin involvement, or Grade ≥3 diarrhea. - Prior solid organ transplantation. - Major surgery within 4 weeks before the start of study therapy. - Prior therapy with certain excluded drugs. - Ongoing immunosuppressive therapy other than corticosteroids. - Use of a strong inhibitor or inducer of cytochrome P450 (CYP) 3A4. - Use of a drug known to prolong the QT interval. - Concurrent participation in another therapeutic or imaging clinical trial. - Presence of a medical condition that (in the judgement of the investigator) interferes with the ability of the subject to participate in the study.


City of Hope Comprehensive Cancer Center
Status: ACTIVE
Los Angeles
UCLA / Jonsson Comprehensive Cancer Center
Contact: April Johnson
Phone: 949-653-2959ext118
San Diego
University of California San Diego
Status: ACTIVE


University of Nebraska Medical Center
Status: ACTIVE


OHSU Knight Cancer Institute
Status: ACTIVE


M D Anderson Cancer Center
Status: ACTIVE

ROR1 is a cell-surface protein that has an important role in the formation of the nervous

systems, bones, and blood vessels during the early development of the embryo. ROR1 disappears

by the time of birth and is not detected on normal human tissues in childhood or adulthood.

However, ROR1 can reappear on malignant tissues, including on hematologic cancers. This

selective expression of ROR1 on cancerous cells but not on normal cells offers the potential

for using VLS 101 to specifically kill the cancer cells while sparing normal cells.

VLS-101 is an investigational drug consisting of a monoclonal antibody that binds to ROR1

coupled with a potent toxin called monomethyl auristatin E (MMAE). After the antibody binds

to ROR1 on cancer cells, the ADC can internalize into those cells, where the MMAE is released

and can destroy the malignant cells. In mouse models of human hematologic cancers, VLS-101

has caused highly significant tumor shrinkage.

This clinical trial is a Phase 1 study evaluating VLS-101 across a range of dose levels.

People with several types of hematological cancers are eligible, including those with

previously treated acute lymphocytic leukemia (ALL), acute myeloid leukemia (AML), Burkitt

lymphoma (BL), chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL), diffuse

large B-cell lymphoma (DLBCL), follicular lymphoma (FL), lymphoplasmacytoid

lymphoma/Waldenström macroglobulinemia (LPL/WM), mantle cell lymphoma (MCL), marginal zone

lymphoma (MZL), Richter transformation lymphoma (RTL), or T-cell lymphoma.

VLS-101 is administered intravenously in repeated 3-week cycles with a drug infusion on Day 1

of each cycle (Schedule 1); in repeated 3-week cycles with drug infusions on Days 1 and 8 of

each cycle (Schedule 2); or in repeated 4-week cycles with drug infusions on Days 1, 8, and

15 of each cycle (Schedule 3). The primary goal of this study is to define a maximum

tolerated dose (MTD) for each schedule of administration. For each patient, therapy can

continue as long as the patient is tolerating the therapy and appears to have evidence of


During the study, blood and electrocardiogram testing is performed to assess for any VLS-101

effects on liver, kidney, bone marrow, and heart function (safety); evaluate how much VLS 101

and its breakdown products appear in the blood (pharmacokinetics); determine if VLS 101 is

altering cancer cells or cancer-related proteins (pharmacodynamics); measure for antidrug

antibodies to VLS 101 (immunogenicity); and examine tumors to understand whether the types of

cancer cells will affect the study drug effects. Scans are performed periodically to assess

for changes in tumor status.

Trial Phase Phase I

Trial Type Treatment

Lead Organization
VelosBio Inc.

  • Primary ID 2140-001
  • Secondary IDs NCI-2019-01263, VLS-101-0001
  • ID NCT03833180