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A Study of LOXO-260 in Cancer Patients With a Change in a Particular Gene (RET) That Has Not Responded to Treatment

A Phase 1 Study of Oral LOXO-260 in Patients With RET Fusion-Positive Solid Tumors, Medullary Thyroid Cancer, and Other Tumors With RET Activation Refractory to Selective RET Inhibitors

Status
Completed
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05241834
Enrollment
70
Registered
2022-02-16
Start date
2022-03-23
Completion date
2026-06-03
Last updated
2026-08-21

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Carcinoma, Non-Small-Cell Lung, Thyroid Neoplasms

Keywords

Solid tumors with RET alteration

Brief summary

The main purpose of this study is to learn more about the safety, side effects, and effectiveness of LOXO-260. LOXO-260 may be used to treat cancer that has a change in a particular gene (known as the RET gene). Participation could last up to 24 months (2 years) and possibly longer if the disease does not get worse.

Interventions

Oral

Sponsors

Eli Lilly and Company
Lead SponsorINDUSTRY

Study design

Allocation
NON_RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
12 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Must be ≥ 18 years of age at the time of signing the informed consent (Phase 1a and Phase 1b). Patients 12 years and older may be enrolled in Phase 1b for countries and sites where approved. * Must have evidence of a previously documented RET fusion (solid tumors) or RET mutation (MTC or MEN2-associated cancers) that is a histological or a cytological proven diagnosis of locally advanced, unresectable and/or metastatic cancer and meet cohort-specific criteria. * Have received a prior selective RET inhibitor. * Eastern Cooperative Oncology Group (ECOG) score of 0 to 1 (age \> 16 years), Karnofsky Performance Status (KPS) ≥ 80 (age \> 16 years), or Lansky Performance Status (LPS) ≥ 40% (age \< 16 years). * Have discontinued all previous treatments for cancer with resolution of any significant AEs, and of all clinically significant toxic effects of prior locoregional therapy, surgery, radiotherapy, or systemic anticancer therapy. * Have adequate organ function. * Phase 1b expansion: Patients must have measurable disease per RECIST v 1.1. * Phase 1b expansion: Molecular Pathology Results (including RET and other genes) from a sample, blood or tissue, taken on or after RET selective treatment.

Exclusion criteria

* Disease suitable for local therapy administered with curative intent. * Have an active fungal, bacterial, and/or active untreated viral infection. * The patient has a serious pre-existing medical condition(s). * Have symptomatic CNS malignancy or metastasis. * Patients treated with drugs known to be strong inhibitors or inducers of cytochrome P450 3A (CYP3A). * Progression of disease within 4 months of starting a prior selective RET inhibitor. * Phase 1b expansion: Patients harboring known activating bypass alterations outside RET that may confer resistance to LOXO-260.

Design outcomes

Primary

MeasureTime frameDescription
Phase 1 a: To determine the MTD/RP2D of LOXO-260: Dose limiting toxicity (DLT) rateDuring the first 28-day cycle of LOXO-260 treatmentDLT rate

Secondary

MeasureTime frameDescription
Phase 1b: To assess the antitumor activity: Overall response rate (ORR)Up to approximately 24 months or 2 yearsORR per Response Evaluation Criteria in Solid Tumors Version (RECIST) 1.1
To characterize the PK properties of LOXO-260: Mean concentration of LOXO-260Up to approximately 24 months or 2 yearsPK: Mean concentration of LOXO-260
To assess the antitumor activity of LOXO-260: ORRUp to approximately 24 months or 2 yearsORR per RECIST 1.1

Countries

France, United States

Contacts

STUDY_DIRECTOREmin Avsar

Eli Lilly and Company

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Aug 22, 2026