for people ages 18 years and up (full criteria)
at Santa Monica, California and other locations
study started
completion around



The main purpose of this study is to learn more about the safety, side effects, and effectiveness of LOXO-435. LOXO-435 may be used to treat cancer of the cells that line the urinary system and other solid tumor cancers that have a change in a particular gene (known as the FGFR3 gene). Participation could last up to 30 months (2.5 years) and possibly longer if the disease does not get worse.

Official Title

An Open-Label, Multicenter Study of LOXO-435 (LY3866288) In Advanced Solid Tumor Malignancies With FGFR3 Alterations


This is an open-label, multi-center, phase 1a/b study in participants with FGFR3-altered advanced solid tumors, including metastatic urothelial cancer (UC). The study will be conducted in 2 phases: Dose escalation and dose optimization (1a) and dose expansion (1b). Phase 1a will include up to 2 cohorts to assess safety, tolerability, and pharmacokinetics of LOXO-435 to determine the recommended phase 2 dose (RP2D) (or optimal dose). Phase 1b will include 4 dose expansion cohorts of participants with prespecified activating FGFR3 alterations to evaluate the efficacy and safety of LOXO-435 at the RP2D. Cohort B will enroll pts with metastatic UC and includes three cohorts to evaluate LOXO-435 as monotherapy (B1, B2) and in combination with pembrolizumab (B3). Cohort C will enroll pts with non-UC advanced solid tumors and includes a cohort to evaluate LOXO-435 as monotherapy (C1).


Urinary Bladder Neoplasms, Neoplasm Metastasis, Ureteral Neoplasms, Bladder Cancer, Bladder Urothelial Carcinoma, Urinary Bladder Cancer, Urinary Tract Cancer, Renal Pelvis Cancer, Ureter Cancer, Neoplasms, Pembrolizumab, LOXO-435


You can join if…

Open to people ages 18 years and up

  • Have solid tumor cancer with an FGFR3 pathway alteration on molecular testing in tumor or blood sample that is deemed as actionable.
    • Cohort A1 (Dose Escalation): Presence of an alteration in FGFR3 or its ligands.
    • Cohort A2 (Dose Optimization): Histological diagnosis of urothelial cancer (UC) that is locally advanced or metastatic with a qualifying FGFR3 alteration.
    • Cohorts B1, B2 and B3 (Dose Expansion): Histological diagnosis of urothelial cancer that is locally advanced or metastatic with a prespecified activating FGFR3 alteration.
    • Cohort C (Dose Expansion): Must have histological diagnosis of a non-urothelial solid tumor malignancy that is locally advanced or metastatic with a prespecified activating FGFR3 alteration.
  • Measurability of disease:
    • Cohort A1: Measurable or non-measurable disease as defined by Response Evaluation Criteria in Solid Tumors v 1.1 (RECIST v1.1)
    • Cohorts A2, B1, B2, B3, and C1: Measurable disease required as defined by RECIST v1.1
  • Have adequate archival tumor tissue sample available or undergo a screening biopsy if allowed per country-specific regulations.
  • Have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
  • Prior Systemic Therapy Criteria:
    • Cohort A1/C1: Participant has received all standard therapies for which the participant was deemed to be an appropriate candidate by the treating Investigator; OR the participant is refusing the remaining most appropriate standard of care treatment; OR there is no standard therapy available for the disease. There is no restriction on number of prior therapies.
    • Cohort A2/B1/B2/B3: Participants must have received at least one prior regimen in the advanced or metastatic setting. There is no restriction on number of prior therapies.
  • FGFR inhibitor specific requirements:
    • Cohort A1/A2: Prior FGFR inhibitor treatment is permitted, but not required.
    • Cohort B1: Participants must have been previously treated with a FGFR inhibitor.
    • Cohort B2, B3, C1: Participants must be FGFR inhibitor naïve.

You CAN'T join if...

  • Participants with primary central nervous system (CNS) malignancy.
  • Known or suspected history of uncontrolled CNS metastases.
  • Current evidence of corneal keratopathy or retinal disorder.
  • Have a history and/or current evidence of extensive tissue calcification.
  • Any serious unresolved toxicities from prior therapy.
  • Significant cardiovascular disease.
  • Prolongation of the QT interval corrected for heart rate using Fridericia's formula (QTcF).
  • Active uncontrolled systemic infection or other clinically significant medical conditions.
  • Participants who are pregnant, lactating, or plan to breastfeed during the study or within 6 months of the last dose of study treatment. Participants who have stopped breastfeeding may be enrolled.


  • UCLA Department of Medicine-Hematology/Oncology accepting new patients
    Santa Monica California 90095 United States
  • City of Hope Medical Center accepting new patients
    Duarte California 91010 United States


accepting new patients
Start Date
Completion Date
Eli Lilly and Company
A Study of LOXO-435 in Patients With Cancer With a Change in a Gene Called FGFR3 Sign up for this study
Phase 1 research study
Study Type
Expecting 180 study participants
Last Updated