Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.

NCT04910685 · ClinicalTrials.gov registry record · Phase 2

(HARBOR) Study to Evaluate Efficacy and Safety of BLU-263 Versus Placebo in Patients With Indolent Systemic Mastocytosis

A Phase 2 study of Indolent Systemic Mastocytosis and Smoldering Systemic Mastocytosis, sponsored by Blueprint Medicines Corporation.

Recruiting
Registry status
Phase 2
Development phase
534
Enrollment target
20
Study locations

NCT04910685: Recruiting Phase 2 study of Indolent Systemic Mastocytosis and Smoldering Systemic Mastocytosis, sponsored by Blueprint Medicines Corporation.

NCT04910685 is a Phase 2 study of Indolent Systemic Mastocytosis and Smoldering Systemic Mastocytosis that is actively recruiting participants, run by Blueprint Medicines Corporation. The registered enrollment target is 534 participants, above the 169-participant average among 3 other Indolent Systemic Mastocytosis trials with a reported enrollment target (216% higher). The trial reports 20 study locations across 16 states. According to ClinicalTrials.gov, the official US trial registry.

View on ClinicalTrials.gov ↗

View your shortlist →

The verdict

NCT04910685, a Phase 2 study of Indolent Systemic Mastocytosis and Smoldering Systemic Mastocytosis, is actively recruiting participants, sponsored by Blueprint Medicines Corporation.

RECRUITING
Registry status
Phase 2
Development phase
534 participants
Enrollment target
20
Study locations

Study Summary

This is a randomized, double-blind, placebo-controlled, Phase 2/3 study comparing the efficacy and safety of elenestinib (BLU-263) + symptom directed therapy (SDT) with placebo + SDT in participants with indolent systemic mastocytosis (ISM) whose symptoms are not adequately controlled by SDT. Parts 1 and 2 will enroll participants with ISM. Participants enrolled in Part 2 will roll over onto Part 3 to receive treatment with elenestinib in an open-label fashion following completion of the earlier Part. Part K will enroll participants with ISM who have previously received an approved selective KIT inhibitor. The study also includes pharmacokinetic (PK) groups that will enroll participants with ISM.

Interventions

  • DRUG Placebo
  • DRUG Elenestinib

Study Locations (20)

Other

  • Kepler Universitatsklinikum, Med Campus III. Clinic of Internal Medicine 3 - Hematology and Oncology - Linz
  • CHU Amiens-Picardie - Amiens
  • CHU de Caen - Caen

California

  • David Geffen School of Medicine at UCLA - Los Angeles
  • Stanford Cancer Institute - Palo Alto

New York

  • Roswell Park Cancer Institute - Buffalo
  • Columbia University Medical Center - New York

Alabama

  • University of Alabama at Birmingham - Birmingham

Colorado

  • UCHealth Blood Disorders and Cell Therapies Center - Anschutz Medical Campus - Aurora

Georgia

  • Winship Cancer Institute, Emory University - Atlanta

Massachusetts

  • Brigham and Women's Hospital - Boston

Michigan

  • Michigan Medicine University of Michigan - Ann Arbor

Trial Details

FieldValue
Enrollment Target 534 participants
Start Date 2021-11-30
Est. Completion 2032-09-30
Phase Phase 2
Blueprint Medicines Corporation

24 total trials

What NCT04910685 shows while recruiting

NCT04910685 is an interventional study that assigns participants to a tested intervention. The registered 534 participants enrollment target is mid-sized for trials with a published cap, above the 169-participant average among 3 other Indolent Systemic Mastocytosis trials with a reported enrollment target (216% higher).

The record links to 2 conditions, with Indolent Systemic Mastocytosis appearing as the primary indexed condition, and to 2 interventions - of which Placebo is the first listed.

NCT04910685 names 20 study sites across 16 states, led by Other, California, New York.

Frequently Asked Questions

What is clinical trial NCT04910685 about?

NCT04910685 is a clinical study titled "(HARBOR) Study to Evaluate Efficacy and Safety of BLU-263 Versus Placebo in Patients With Indolent Systemic Mastocytosis". This is a randomized, double-blind, placebo-controlled, Phase 2/3 study comparing the efficacy and safety of elenestinib (BLU-263) + symptom directed therapy (SDT) with placebo + SDT in participants with indolent systemic mastocytosis (ISM) whose symptoms are not adequately controlled by SDT. Parts ...

What is the current status of trial NCT04910685?

This trial is currently recruiting. It is a Phase 2 study. The enrollment target is 534 participants. The study started on 2021-11-30. Estimated completion is 2032-09-30.

What conditions does trial NCT04910685 study?

This clinical trial studies the following conditions: Indolent Systemic Mastocytosis, Smoldering Systemic Mastocytosis.

What interventions are being tested in trial NCT04910685?

The interventions under investigation include: Placebo (DRUG), Elenestinib (DRUG).

Who is sponsoring clinical trial NCT04910685?

This trial is sponsored by Blueprint Medicines Corporation, which has 24 total clinical trials registered on ClinicalTrials.gov.

Where is trial NCT04910685 being conducted?

This trial has 20 study locations across Alabama, California, Colorado, Georgia, Massachusetts. Contact the study sites directly through ClinicalTrials.gov for enrollment availability.

Similar trials for Indolent Systemic Mastocytosis

Matched on the same primary condition, ranked to surface studies in the same phase first, then by recruiting status, no relevance scoring or editorial curation.

Nationwide trials with similar profiles

Cross-condition peers matched on enrollment target and registry start date, not the same-condition list above.

Similar enrollment target

  • NCT06128551 · 534 participants · Phase 1

    Study of Elironrasib and Daraxonrasib as Monotherapies and Combination Therapy in Participants With Advanced KRAS G12C Mutant Solid Tumors

  • NCT05614739 · 535 participants · Phase 1

    FORAGER-1: A Study of LOXO-435 (LY3866288) in Participants With Cancer With a Change in a Gene Called FGFR3

  • NCT07091617 · 535 participants · NA

    Testing an Enhanced Digital Delivery Model for Inherited Cancer Genetic Testing in Young Adults With Cancer

  • NCT05793151 · 532 participants · NA

    Multi-Site Trial of Navigation vs Treatment as Usual to Improve Initiation of Timely Adjuvant Therapy

Similar registry start date

  • NCT05962346 · started 2026-12 · NA

    Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia

  • NCT07125183 · started 2026-12 · Phase 2

    Study on Efficacy and Tolerability of Weekly Doxorubicin in Elderly Patients With Advanced or Metastatic Leiomyosarcoma

  • NCT07292298 · started 2026-11 · Phase 2

    Phase 2 Single-Arm Rectal Cancer Brachytherapy for Patients With Low-Lying Residual Adenocarcinoma After Total Neoadjuvant Therapy to Improve Organ Preservation Rates

  • NCT04263285 · started 2026-10 · NA

    Treatment of Depression Post-SCI

Source: ClinicalTrials.gov NCT04910685, the US trial registry maintained by the National Library of Medicine. NCT04910685 (mid enrollment · wide site footprint · recruiting) retrieved and formatted by PlainTrial, see methodology.