Overview

To determine if the addition of vancomycin to SBRT increases a Th1 immune response measured by cytokine expression (IFN gamma)

Eligibility

Inclusion Criteria:

• Patient is planned to receive Stereotactic Body Radiotherapy (SBRT) to a biopsy-proven NSCLC
• Age 18 years old or older
• Patient capable of giving informed consent

Exclusion Criteria:

• Use of antibiotics, antifungal, antivirals or antiparasitics during the 4 weeks prior to registration
• Active infection with oral temperature >100°F
• Use of corticosteroids, methotrexate or immunosuppressive drugs during the 4 weeks prior to registration
• Use of chemotherapy during the 4 weeks prior to radiotherapy or during radiotherapy. Chemotherapy cannot begin before the collection of the 30-day post treatment sample (S4).
• Documented history of HIV, HBV or HCV
• Chronic constipation (bowel movements less frequent than every other day)
• Active uncontrolled gastrointestinal disorders such as inflammatory bowel disease, moderate/severe irritable bowel syndrome, persistent, infectious gastroenteritis, colitis or gastritis, persistent or chronic diarrhea of unknown etiology, Clostridium Difficile infection (within 2 years of lung cancer diagnosis) or Helicobacter Pylori infection (untreated)
• Major surgery of the GI tract, with the exception of cholecystectomy and appendectomy, in the past five years. Any major bowel resection at any time
• Patients on anti-diarrheal medications
• Patients on probiotics