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Phase 2 N=45 Treatment

Trial of EP0057, a Nanoparticle Camptothecin With Olaparib in People With Relapsed/Refractory Small Cell Lung Cancer

Urothelial Carcinoma · Urothelial Cancer · Lung Neoplasms · Small Cell Lung Cancer · Prostate Cancer

Enrolled (actual)
45
Serious AEs
62.2%
Results posted
Jul 2025
Primary outcome: Primary: Phase I: Maximum Tolerated Dose (MTD)/Recommended Phase 2 Dose (RP2D) of EP0057 (CLRX101) in Participants With Refractory Cancers. — 12 mg/m^2

Study Design & Population

Study type
Interventional
Phase
Phase 2
Interventions
EP0057 (Drug); olaparib (Drug); CT scan (Diagnostic_test); CT chest, abdomen, and pelvis (Diagnostic_test); Bone scan (Diagnostic_test); ECG (Diagnostic_test); Echocardiogram (Diagnostic_test); Biopsy (Procedure)
Age
Adult, Older Adult · 18+ yrs
Sex
All
Sponsor
National Cancer Institute (NCI)
Primary completion
Apr 2023

Outcome Measures

OutcomeResultp-value
PRIMARY
Phase I: Maximum Tolerated Dose (MTD)/Recommended Phase 2 Dose (RP2D) of EP0057 (CLRX101) in Participants With Refractory Cancers.
12
PRIMARY
Phase I: Maximum Tolerated Dose (MTD)/Recommended Phase 2 Dose (RP2D) of Olaparib in Participants With Refractory Cancers.
250
PRIMARY
Number of Dose Limiting Toxicities (DLTs) During the First Cycle
0; 0; 0; 2; 1
PRIMARY
Expansion: Progression Free Survival (PFS) Rate in the Combination of Olaparib Plus EP0057 (CLRX101) at 16 Weeks in Small Cell Lung Cancer (SCLC) Participants
2
PRIMARY
Expansion: Overall Response Rate (Complete Response (CR) + Partial Response (PR) of EP0057 (CLRX101) Plus Olaparib in Participants With Urothelial Carcinoma
1
PRIMARY
Expansion: Overall Response Rate (Complete Response (CR) + Partial Response (PR) of EP0057 (CLRX101) Plus Olaparib in Participants With Metastatic Castration-Resistant Prostate Cancer (mCRPC)
1
SECONDARY
Occurrences of Toxicities Including Toxicity Type and Severity (Grades 1, 2, and 3) With Probable Association to Study Regimen in Participants on Expansion Cohorts
1; 0; 0; 1; 0; 1
SECONDARY
Progression-free Survival (PFS) on Expansion Cohorts
1.97; 1.90; 8.67
SECONDARY
Progression-free Survival (PFS) of the Combination
4.71; 8.37; 8.37; 4.154; 13.18
SECONDARY
Overall Survival (OS) of the Combination
2.07; 2.30; 2.57; 1.54; 9.72; 4.15
SECONDARY
Prostate-specific Antigen (PSA) on Metastatic Castration-Resistant Prostate Cancer (mCRPC) Expansion Cohort Reported at Time of Documented Partial Response (PR) With an 80% Confidence Interval
75.35; 32.14
SECONDARY
Prostate-specific Antigen (PSA) on Metastatic Castration-Resistant Prostate Cancer (mCRPC) Expansion Cohort Reported at Time of Documented Partial Response (PR) an 95% Confidence Interval
75.35; 32.14
SECONDARY
Duration of Response (DOR) of the Combination
7.95; NA; NA; NA
SECONDARY
Occurrences of Toxicities Including Toxicity Type and Severity (Grades 1, 2, 3, 4 and/or 5) With Probable Association to Study Regimen in Participants on Solid Tumor Cohorts
0; 0; 0; 0; 1; 0
SECONDARY
Maximum Observed Plasma Concentration of EP0057 (Both the Total Drug and Released Camptothecin) and Olaparib
6191.2; 5641.1; 5307.0; 4998.4; 5844.9; 403.61
SECONDARY
Pharmacodynamic (PD) Activity of EP0057 in Surrogate Tissue Specimens
SECONDARY
Pharmacodynamic (PD) Activity of EP0057 in Tumor Biopsy Specimens

Summary

Background: EP0057 (formerly CRLX101) consists of a sugar molecule cyclodextrin linked to a chemotherapy drug called camptothecin. The combined molecule or "nanoparticle drug conjugate" travels through the blood. Once inside cancer cells, the chemotherapy drug is released from the molecule. Olaparib is a drug that may stop cancer cells from repairing the deoxyribonucleic acid (DNA) damage caused by chemotherapy. Researchers want to see how safe it is to give EP0057 and olaparib together and to see how well the combination treats a specific type of lung cancer called small cell lung cancer (SCLC). Objectives: To test the safety and maximum dose of EP0057 and olaparib together. To test how well they treat small cell lung cancer. Eligibility: Adults 18 and older with small cell lung cancer. Design: Participants will be screened with standard cancer care tests. Participants will get the 2 study drugs in 28-day cycles. EP0057 will be given every 2 weeks, through a small plastic tube in an arm vein. Olaparib will be taken by mouth twice a day most days. Participants will keep a pill diary. For Cycle 1, participants will have 3 visits. All other cycles will have 2 visits. At study visits, participants may have: * Blood and hair samples taken * History and Physical exam * Questions about health and side effects * Pregnancy test * Optional tumor biopsy where a piece of tumor is removed by needle after numbing the skin. * Computed tomography (CT) scan * Injection of EP0057 (twice per cycle) * Olaparib prescription Participants will have a follow-up visit 4 weeks after finish taking the drugs. They will have a physical exam and blood tests. They may have a tumor biopsy. The study team will call the patient every 3 months for follow up after completing the study treatment.

Eligibility Criteria

  • INCLUSION CRITERIA: - Phase I
  • Patients must have histologically or cytologically confirmed advanced solid tumor that is resistant or refractory to standard therapy.
  • A minimum of 2 weeks will be required from any prior therapy, including chemotherapy, immunotherapy and/or radiation. In addition, recovery to Grade =3,000/mcL
  • absolute neutrophil count >=1, 500/mcL without growth factor support
  • platelets >=100,000/mcL without growth factor support
  • hemoglobin >=9 g/dL, and no blood transfusion within 4 weeks.

OR

  • Hemoglobin >10 g/dL, and no blood transfusion within 2 weeks.
  • total bilirubin = 51 mL/min (calculated using the Cockroft-Gault formula) for patients with creatinine levels above institutional normal.

-The effects of EP0057 (formerly CRLX101) and olaparib on the developing human fetus are unknown. For this reason and because these agents as well as other therapeutic agents used in this trial are known to be teratogenic, women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation and for 120 days (both male and female) following last dose of study drug. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Fertile females of childbearing potential are defined as women physically capable of becoming pregnant unless the female patient cannot have children because of surgery or other medical reasons (effective tubal ligation, ovaries or the uterus removed, or are post-menopausal). Post-menopausal is defined as:

  • Amenorrheic for 1 year or more following cessation of exogenous hormonal treatments,
  • Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels in the post-menopausal range for women under 50,
  • radiation-induced oophorectomy with last menses >1 year ago,
  • chemotherapy-induced menopause with >1 year interval since last menses,
  • or surgical sterilization (bilateral oophorectomy or hysterectomy).
  • Negative urine pregnancy test =18 years.
  • Patients must have histologically or cytologically confirmed diagnosis of SCLC from a Clinical Laboratory Improvement Amendments (CLIA)-certified laboratory.
  • Have received and progressed during or after a platinum-based standard chemotherapy regimen and/or an immune-checkpoint inhibitor
  • Patients could have received any number of therapies for relapsed or progressive disease, including re-treatment with original frontline regimen. A minimum of 2 weeks will be required from any prior therapy, including chemotherapy, immunotherapy and/or radiation. In addition, recovery to Grade =3,000/mcL
  • absolute neutrophil count >=1, 500/mcL without growth factor support
  • platelets >=100,000/mcL without growth factor support
  • hemoglobin >=9 g/dL, and no blood transfusion within 4 weeks.

OR

  • hemoglobin >10 g/dL, and no blood transfusion within 2 weeks.
  • total bilirubin =51 mL/min (calculated using the Cockroft-Gault formula) for patients with creatinine levels above institutional normal.
  • The effects of EP0057 and olaparib on the developing human fetus are unknown. For this reason and because these agents are known to be teratogenic, women of child-bearing potential and men must agree to use highly effective contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of study participation and for 120 days (both male and female) following last dose of study drug. Should a woman become pregnant or suspect she is pregnant while she or her partner is participating in this study, she should inform her treating physician immediately. Fertile females of childbearing potential are defined as women physically capable of becoming pregnant unless the female patient cannot have children because of surgery or other medical reasons (effective tubal ligation, ovaries
View full record on ClinicalTrials.gov →

Data sourced from ClinicalTrials.gov (NCT02769962). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.

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