Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

A Study to Evaluate Sildenafil for the Treatment of Lymphatic Malformations

This study has been completed.
Information provided by (Responsible Party):
Alfred Lane, Stanford University Identifier:
First received: February 3, 2011
Last updated: May 22, 2015
Last verified: May 2015
There is an unsatisfied medical need for a first-line treatment of lymphatic malformations with a good benefit/risk profile. Based on a patient experience in the institution, the investigators plan to verify whether or not the medication sildenafil has a beneficial effect on lymphatic malformations. The investigators plan to do this by treating patients with lymphatic malformations with the medication sildenafil for a 20 week period. This is an investigator initiated study funded by an Innovations in Patient Care grant and a SPARK grant.

Condition Intervention Phase
Drug: Sildenafil
Phase 1
Phase 2

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: An Investigational Pilot Study to Evaluate Sildenafil for the Treatment of Lymphatic Malformations

Resource links provided by NLM:

Further study details as provided by Stanford University:

Primary Outcome Measures:
  • Change in Volume of Lymphatic Malformation [ Time Frame: Baseline, 20 weeks ]
    Participants were given sildenafil for 20 weeks. Participants weighing more than 20 kg were given 20 mg 3 times daily (60 mg/day). Participants weighing between 8 kg and 20 kg were given 10 mg 3 times daily (30 mg/day).

Enrollment: 7
Study Start Date: December 2010
Study Completion Date: December 2013
Primary Completion Date: April 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Open Label
Sildenafil oral tablet three times daily
Drug: Sildenafil
Sildenafil oral tablet three times daily
Other Names:
  • Revatio
  • Viagra

Detailed Description:
Lymphatic malformations can be challenging to treat. Mainstay interventions including surgery and sclerotherapy are invasive and can result in local recurrence and complications. We sought to assess the effect of 20 weeks of oral sildenafil on reducing lymphatic malformation volume and symptoms in children. Seven children (4 boys, 3 girls; ages 13-85 months) with lymphatic malformations were given oral sildenafil for 20 weeks in this open-label study. The volume of the lymphatic malformation was calculated blindly using magnetic resonance imaging performed before and after 20 weeks of sildenafil. Lymphatic malformations were assessed clinically on weeks 4, 12, 20, and 32. Both the physician and parents evaluated the lymphatic malformation in comparison with baseline. Sildenafil can reduce lymphatic malformation volume and symptoms in some children. ( J Am Acad Dermatol 2014;70:1050-7.)

Ages Eligible for Study:   6 Months to 10 Years   (Child)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  1. Written informed consent(s) for study participation and (where applicable) the use of the participant's images are obtained according to national regulations from the participant's parent(s) or guardian(s) prior to performing any study procedures.
  2. The participant is 6 months to 10 years of age at inclusion.
  3. The participant weight is at least 8kg.
  4. A diagnosis of LM or mixed venous lymphatic malformation involving the skin and subcutaneous tissue and at least 3cm based on clinical and radiographic criteria.
  5. LMs may benefit from systemic therapy based on clinical criteria.
  6. Females must not be pregnant or breast-feeding.
  7. If participant is a child, parent/guardian must be able to follow instructions and must be willing and able to ensure that the subject is present for all required study visits.
  8. Subject has no contraindication for use of sildenafil.
  9. LMs may involve any part of the body.
  10. Subject will have normal results on screening tests (eye exam, blood tests).
  11. Subject has no contraindication for MRI examinations, such as metal implants, etc.
  12. Subject must not be a smoker.

Exclusion Criteria:

  1. The participant has a medically unstable health status that may interfere with his/her ability to complete the study.
  2. The participant presents with one or more of the following medical conditions: hepatic impairment; severe renal impairment; lymphedema conditions such as Milroy disease, Meige lymphedema, Hennekam syndrome, Njolstad syndrome, Aagenaes syndrome, and Fabry disease; hypotension or at risk for hypotension; seizures or history of seizures; any significant cardiovascular risk factors and any condition which requires participants to use nitric oxide donors or nitrates in any form; underlying anatomic or vascular risk factors for developing non-arteritic anterior ischemic optic neuropathy (NAION) including low ocular cup to disc ratio, age over 10, diabetes, hypertension, coronary artery disease, hyperlipidemia, and smoking. (Participants with Down syndrome, Turner syndrome, and Noonan syndrome will be considered on a case-by-case basis).
  3. The participant has received at least one of the following medications contraindicated in association with sildenafil within 15 days of inclusion: Alprostadil, Azole antifungals, Clarithromycins, Conivaptan, Delavirdine, Erythromycins, Fluvoxamine, Grapefruit, Imatinib, Nefazodone, Nitrates/sodium thiosulfate, Non-selective and selective alpha blockers, Protease inhibitors, Rufinamide, Tadalafil, Telithromycin, Vardenafil, Yohimbe, Yohimbine, Amifostine, Lapatinib, Warfarin
  4. The participant requires concomitant use of potent cytochrome P450 3A4 inhibitors (such as ketoconazole, itraconazole, erythromycin, saquinavir) or concomitant use of ritonavir.
  5. The patient has had extensive prior surgery or sclerotherapy to treat LM such that scarring may interfere with the treatment effect of sildenafil.
  6. The participant has previously been administered treatment for LMs or surgical procedures have been performed to remove the index LMs.
  7. Participant is currently pregnant or considering becoming pregnant in the next 20 weeks.
  8. The participant is known to have an allergy to sildenafil.
  9. Ulcerated or currently infected LMs with pain.
  10. Diagnosis of the soft tissue tumor as LM is not clinically certain.
  11. The participant is participating in another clinical study.
  12. The participant has a history of priapism or is diagnosed with sickle cell anemia or any other disorder which may predispose to priapism.
  13. The investigator may declare any subject ineligible for a valid medical reason.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01290484

United States, California
Stanford University School of Medicine
Stanford, California, United States, 94305
Sponsors and Collaborators
Stanford University
Principal Investigator: Alfred T Lane, MD Stanford University
  More Information

Responsible Party: Alfred Lane, Professor of Dermatology and of Pediatrics, Emeritus, Stanford University Identifier: NCT01290484     History of Changes
Other Study ID Numbers: SU-10202010-7129
UL1TR000093 ( US NIH Grant/Contract Award Number )
Study First Received: February 3, 2011
Results First Received: May 13, 2014
Last Updated: May 22, 2015

Keywords provided by Stanford University:
Lymphatic malformation, vascular malformation

Additional relevant MeSH terms:
Congenital Abnormalities
Lymphatic Abnormalities
Lymphatic Vessel Tumors
Neoplasms by Histologic Type
Lymphatic Diseases
Sildenafil Citrate
Vasodilator Agents
Phosphodiesterase 5 Inhibitors
Phosphodiesterase Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Urological Agents processed this record on April 28, 2017