for people ages 18 years and up (full criteria)
at UC Davis UCLA
study started
completion around



This is a Phase 1 dose-escalation study of PRT3789, a SMARCA2 degrader, in participants with advanced or metastatic solid tumors with loss of SMARCA4 due to truncating mutation and/or deletion. The purpose of this study is to evaluate the safety, tolerability, pharmacokinetic (PK), and pharmacodynamic (PD) of PRT3789 monotherapy and in combination with docetaxel, describe any dose limiting toxicities (DLTs), define the dosing schedule, and to determine the maximum tolerated dose (MTD) and recommended phase 2 dose (RP2D) to be used in subsequent development of PRT3789.

Official Title

A Phase 1 Open-Label, Multi-Center, Safety and Efficacy Study of PRT3789 as Monotherapy and in Combination With Docetaxel in Participants With Advanced or Metastatic Solid Tumors With a SMARCA4 Mutation


This is an open-label, multi-center, dose-escalation, first in human, Phase 1 study of PRT3789 as monotherapy and in combination with docetaxel, a SMARCA2 degrader, evaluating participants with advanced or metastatic solid tumors with loss of SMARCA4 due to truncating mutation and/or deletion. The study will evaluate escalating doses of PRT3789 until the MTD or RP2D is determined. Taking into account pharmacokinetic and pharmacodynamic data from the preceding dose levels, the dose may be escalated until a dose limiting toxicity is identified. Approximately 118 participants will be enrolled in monotherapy, dose escalation, backfill, and combination cohorts.


Advanced Solid Tumor, Metastatic Solid Tumor, Non-small Cell Lung Cancers, SMARCA4 Gene Mutation, Advanced Solid Tumors, BRG1, BRM, Metastatic Solid Tumors, NSCLC, PRT3789, SMARCA2 Degrader, SMARCA4, Docetaxel, Neoplasms, Non-Small-Cell Lung Carcinoma, PRT3789 Monotherapy


You can join if…

Open to people ages 18 years and up

  • Willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations (including contraception requirements), and other study procedures
  • Histologically confirmed advanced, recurrent, or metastatic solid tumor malignancy with any mutation of SMARCA4 (dose escalation and combination cohorts) and loss of function mutation of SMARCA4 (backfill cohorts) by local testing that have either progress on or ineligible for standard of care therapy
  • Must have measurable or non-measureable (but evaluable) disease per RECIST v1.1 for dose escalation and combination cohorts
  • Must have measureable diseases per RECIST v1.1 for backfill cohort
  • Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1
  • Willing to provide either archival or fresh tumor tissue sample
  • Adequate organ function (hematology, renal, and hepatic)

You CAN'T join if...

  • Participants with solid tumors with known concomitant SMARCA2 mutation or loss of protein expression
  • Clinically significant or uncontrolled cardiac disease, uncontrolled electrolyte disorders, uncontrolled or symptomatic central nervous system (CNS) metastases or leptomeningeal disease
  • History of another malignancy within 3 years except for adequately treated basal cell or squamous cell skin cancer, superficial bladder cancer, prostate intraepithelial neoplasm, carcinoma in situ of the cervix, or other noninvasive or indolent malignancies, or malignancies previously treated with curative intent and not on active therapy or expected to require treatment or recurrence during the study
  • Concurrent treatment with strong or moderate CYP3A4 inhibitor or inducer


  • University of California, Davis Comprehensive Cancer Center accepting new patients
    Sacramento California 95817 United States
  • UCLA Hematology/Oncology - Santa Monica accepting new patients
    Santa Monica California 90404 United States


accepting new patients
Start Date
Completion Date
Prelude Therapeutics
Phase 1 research study
Study Type
Expecting 118 study participants
Last Updated