A Phase 4 interventional study of Avapritinib in Mastocytosis, Systemic, sponsored by Blueprint Medicines Corporation. Recruiting at 8 sites in 7 countries. Per ClinicalTrials.gov, last updated 2026-11-09.
Sponsored by Blueprint Medicines Corporation (part of Sanofi) · Phase 4, Interventional, and Treatment
The primary objective of the rollover study is to evaluate the long-term safety of avapritinib in participants who have completed a Blueprint Medicines sponsored study (parent study) and continued to benefit from avapritinib.
56 studies on the registry are indexed under Mastocytosis, Systemic; 16 are open to participants now.
This study's planned enrollment of 60 is above the median of 36 across 34 interventional studies indexed under Mastocytosis, Systemic.
Browse Mastocytosis, Systemic studies →Blueprint Medicines Corporation is the lead sponsor of 32 studies on the registry; 6 are open to participants now.
Of its 14 completed or terminated interventional studies of FDA-regulated products, 3 (21%) have results posted.
First submitted before Blueprint Medicines Corporation became part of Sanofi.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Other protocol-defined criteria apply.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants who have participated in a Blueprint Medicines sponsored study (the parent study) and continue to benefit from avapritinib.
Drug: Avapritinib
Avapritinib will be administered in accordance with the parent study protocol.
Also known as: BLU-285, AYVAKIT®
Incidence of Serious Adverse Events (SAEs), Adverse Events of Special Interest (AESIs), and AEs leading to Discontinuation
Time frame: Up to approximately 4 years
Plan to share: No
No publications or documents are linked to this record.
Started Nov 2024 (actual). Primary completion is estimated for Dec 2027, 37 months after the start.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
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Studies of the drug tested here: Avapritinib
Blueprint Medicines Corporation →