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QTORIN rapamycin

Phase 3

Microcystic Lymphatic Malformation | Small molecule | Rare Disease |Palvella Therapeutics, Inc.|Last Updated: Mar 27, 2026

Target and mechanism

ModalitySmall molecule

Also known as QTORIN 3.9% rapamycin anhydrous gel, QTORIN 3.9% rapamycin anhydrous, QTORIN 3.9% Rapamycin Anhydrous Gel, QTORIN 3.9% Rapamycin Anhydrous

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLED
Total Trials1
Total Enrollment51

FDA Designations

FAST_TRACKBREAKTHROUGH_THERAPYORPHAN_DRUG

Clinical trial landscape

QTORIN rapamycin · 3 trials · 3 indications

Phase 3 2Phase 2 1
NCT06239480SELVA: A Phase 3 Study Evaluating QTORIN 3.9% Rapamycin Anhydrous Gel in the Treatment of Microcystic Lymphatic MalformationsMicrocystic Lymphatic Malformation
ACTIVE NOT_RECRUITING51 Analytics
NCT05180708A Multicenter, Phase 3 Randomized, Double-Blind, Vehicle-Controlled Study Evaluating the Safety and Efficacy of QTORIN 3.9% Rapamycin Anhydrous Gel in the Treatment of Pachyonychia CongenitaPachyonychia Congenita
COMPLETED87 Analytics
PHASE3ACTIVE NOT_RECRUITING
SELVA: A Phase 3 Study Evaluating QTORIN 3.9% Rapamycin Anhydrous Gel in the Treatment of Microcystic Lymphatic Malformations
Microcystic Lymphatic MalformationUnlock trial analytics
PHASE3COMPLETED
A Multicenter, Phase 3 Randomized, Double-Blind, Vehicle-Controlled Study Evaluating the Safety and Efficacy of QTORIN 3.9% Rapamycin Anhydrous Gel in the Treatment of Pachyonychia Congenita
Pachyonychia CongenitaUnlock trial analytics

Study Endpoints

Primary Endpoints

Overall microcystic lymphatic malformations Investigator Global Assessment (mLM-IGA)
At Week 24

A multi-point scale with higher values indicating improvement.

Patient Global Assessment of Activities Difficulty Scale
6 months
Incidence of Treatment-Emergent Adverse Events
Week 12

Secondary Endpoints

Change in the blinded clinician microcystic lymphatic malformations Multicomponent Severity Scale (mLM-MCSS)
At Week 24
Change in the live clinician microcystic lymphatic malformations Multicomponent Severity Scale (mLM-MCSS)
Change from Baseline to Week 24
Overall patient global impression of change (PGI-C)
Change from Baseline to Week 24
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
ActiveEXPERIMENTAL -
VehiclePLACEBO_COMPARATOR -
Single-arm, open-labelEXPERIMENTAL -

Interventions

NameTypeDescription
QTORIN 3.9% Rapamycin Anhydrous GelDRUGQTORIN 3.9% Rapamycin Anhydrous Gel
VehicleDRUGMatching vehicle (QTORIN anyhydrous gel)
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Eligibility Criteria

Age Range3 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites15

Key Inclusion Criteria: * Participant must be at least 3 years of age at time of consent/assent * Participant must have a clinically confirmed superficial/cutaneous microcystic lymphatic malformation Key Exclusion Criteria: * Participants who have vascular malformations that interfere with evalua...

Countries:United StatesUnited Kingdom
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Frequently asked questions about QTORIN rapamycin

What is QTORIN rapamycin?

QTORIN rapamycin is an investigational topical small molecule therapy developed by Palvella Therapeutics, Inc. (PVLA). It is being studied for dermatologic conditions including cutaneous venous malformations, microcystic lymphatic malformation, and pachyonychia congenita. It is formulated as a 3.9% rapamycin anhydrous gel applied directly to the skin.

What is QTORIN rapamycin used for?

QTORIN rapamycin is being developed to treat cutaneous venous malformations, microcystic lymphatic malformation, and pachyonychia congenita. These are dermatologic conditions involving vascular and lymphatic malformations and a rare genetic skin disorder. The drug remains investigational and has not been approved for commercial use.

Who makes QTORIN rapamycin?

QTORIN rapamycin is developed by Palvella Therapeutics, Inc., which trades under the ticker PVLA. The company is advancing the topical rapamycin gel across multiple rare dermatologic indications and holds Fast Track, Breakthrough Therapy, and Orphan Drug designations from the FDA for the program.

What phase is QTORIN rapamycin in?

QTORIN rapamycin is in clinical development, with Phase 2 and Phase 3 studies conducted across its indications. A Phase 3 trial in pachyonychia congenita has completed, and Phase 3 and Phase 2 trials in microcystic lymphatic malformation and cutaneous venous malformations are active. It is investigational and not FDA approved.

What clinical trials is QTORIN rapamycin in?

QTORIN rapamycin has been studied in NCT05180708, a completed Phase 3 trial in pachyonychia congenita with 87 participants, and NCT06239480, an active Phase 3 trial in microcystic lymphatic malformation. A Phase 2 trial, NCT06653842, is evaluating the gel in cutaneous venous malformations. All trials are based in the United States, with the pachyonychia congenita study also including the United Kingdom.

Is QTORIN rapamycin the same as QTORIN 3.9% rapamycin anhydrous gel?

Yes. QTORIN rapamycin is also known as QTORIN 3.9% rapamycin anhydrous gel, QTORIN 3.9% rapamycin anhydrous, and QTORIN 3.9% Rapamycin Anhydrous Gel. These names refer to the same investigational topical formulation developed by Palvella Therapeutics for dermatologic indications.