Midostaurin in Indolent Systemic Mastocytosis

Overview

Rationale: Patients with indolent or smoldering systemic mastocytosis can have severe disabling symptoms. Almost all patients have fatigue, a compromised quality of life, hampering normal functioning. Because this form of mastocytosis is not considered life-threatening, mast cell eradication has never been applied and patients receive only symptomatic therapy with histamine blockers. Midostaurin, a c-KIT inhibitor has shown activity regarding symptom control and decrease of malignant mast cells in patients with aggressive systemic mastocytosis (ASM) or mast cell leukemia

Objective: Primary: To study in a pilot phase II trial the efficacy of midostaurin administered at an oral dose of 100 mg twice daily in patients with indolent or smoldering systemic mastocytosis on mediator symptom reduction, documented by the Mastocytosis Symptom Assessment Questionnaire, measured at 3 months. Secondary: 1. To study whether symptom improvement persists at 6 months, and whether midostaurin can reduce mast cell infiltration in the skin and bone marrow, documented by decrease of serum tryptase, decrease of urticaria pigmentosa and decrease of bone marrow mast cells. 2. To assess safety and tolerability of midostaurin in the above mentioned settings Study design: Single arm, open label pilot phase II study. Study population: Adult patients (n=20) with histologically documented systemic mastocytosis, indolent or smoldering subtype, with severe symptoms, not controlled by histamine 1 and 2 blockers. Intervention: treatment with Midostaurin, twice daily 100 mg orally for 6 months continuously.

Conditions

Interventions

Eligibility

Locations (1)

Outcomes