for people ages 18 years and up (full criteria)
at San Diego, California and other locations
study started
estimated completion



The study is aimed at answering the questions; (1) How well do the most commonly used treatments in iSGS work? and (2) What quality-of-life trade-offs are associated with each approach? With the results of this trial, the investigators hope to provide information to iSGS patients: (1) Given my personal characteristics, conditions, and preferences, what should I expect will happen to me? and (2) What are my options, and what are the potential benefits and harms of these options?

Official Title

Treatment Alternatives in Adult Rare Disease; Assessment of Options in Idiopathic Subglottic Stenosis North American Airway Collaborative PR-02 Study (NoAAC PR-02 Study)


Idiopathic subglottic stenosis (iSGS) is a rare disease in which the trachea narrows for no known reason. Although uncommon (with an estimated incidence of 1:400,000 persons per year), both the disease and its therapies profoundly affect patients' ability to breathe, communicate and swallow. Breathing difficulties (i.e. dyspnea) is the hallmark symptom and the primary cause of death and disability. However, patients can also experience debilitating voice changes and swallowing problems due to the condition or its treatment. People with this disease often require several surgeries per year. A variety of treatments have been advanced to manage iSGS but are generally categorized into: 1) endoscopic dilation of the tracheal stenosis (accomplished with rigid instruments or inflatable balloons); 2) endoscopic resection of the stenosis (with prolonged medical therapy after surgery); or 3) open neck surgery with resection of the affected tracheal segment with end-to-end anastomosis. Each patient can require repeated surgeries to keep their trachea open, which increases odds of treatment side effects and complications. All approaches have unique and often disabling associated side effects, which can significantly affect a patient's quality of life. Because the disease is rare, it is difficult for patients to find good information so that they can understand the spectrum of treatment options. This is particularly difficult because most patients present with severe breathing trouble and need treatment quickly, limiting their ability to explore options. Additionally, there is a general lack of high-quality, reliable, and accessible data to inform individual patient decision-making. Imperfect information and limited evidence on treatment outcomes complicate patient decision-making as they try to balance survival, symptoms, and quality of life considerations. Beyond the gaps in understanding the relative effectiveness of the different treatments available, no studies have explored functional outcomes in iSGS (i.e. how well patients breathe, speak, and swallow after treatments). These endpoints are important to patients and are arguably a primary determinant in decision-making. Direct engagement with patients is critical to understand these quality of life considerations, since patient and physician perspectives aren't always the same. For example, results show that endoscopic dilation is associated with a higher rate of disease recurrence and thus need for repeated surgery. Meanwhile, open tracheal resection is a major surgery with significant immediate perioperative risks and has been associated with alterations in voice and swallowing. Open tracheal resection appears to reduce the risk of disease recurrence, but the degree of benefit, and the trade-offs associated with this approach are unanswered questions. The proposed study from the North American Airway Collaborative (NoAAC PR- 02) is designed to fill this void. Our prospective study will directly compare the effectiveness of standard of care treatments and assess their associated quality of life tradeoffs in iSGS patients.


Idiopathic Subglottic Stenosis (iSGS) Constriction, Pathologic Endoscopic dilation of subglottic stenosis Endoscopic resection of the stenosis Tracheal Resection


You can join if…

Open to people ages 18 years and up

  • Greater than 18 years of age.
  • The lesion must involve the subglottis.

You CAN'T join if...

  • Less than 18 years of age
  • Patients without capacity to consent for themselves
  • History of significant laryngotracheal traumatic injury.
  • History of endotracheal intubation or tracheotomy within 2 years of presentation.
  • Major anterior neck surgery.
  • History of neck irradiation.
  • History of caustic or thermal injuries to the laryngotracheal complex.
  • History of a clinically diagnosed vasculitis or collage vascular disease.
  • Positive antinuclear cytoplasmic antibody titers.


  • University of California San Diego
    San Diego California 92103 United States
  • University of California Irvine
    Irvine California 92606 United States


in progress, not accepting new patients
Start Date
Completion Date
Vanderbilt University Medical Center
Study Type
Last Updated