The sponsor determined that adequate data had been acquired.

The purpose of this study is to confirm the effectiveness and safety of a new medical device which sprays liquid nitrogen through an upper endoscope (cryotherapy) to treat Barrett's esophagus with high-grade dysplasia and early esophageal cancer. It is hypothesized that this treatment will remove the abnormal lining of the esophagus and allow the normal esophageal lining to return.

Barrett's esophagus (BE) with high grade dysplasia (HGD) is a precursor of esophageal adenocarcinoma. Eliminating this condition may control the current rapid rise of adenocarcinoma. Ablative techniques are attempted to avoid the high morbidity and mortality of esophagectomy or for use in patients who cannot undergo surgery. Current ablative techniques have achieved mucosal ablation with variable success but are associated with high cost, patient discomfort and/or significant complications. A novel device which sprays liquid nitrogen through an upper endoscope (cryotherapy) has been shown to be a safe and effective procedure to ablate the esophageal mucosa in swine and dog models and in pilot studies in humans. Successful reversal of BE, LGD, HGD and superficial adenocarcinoma and squamous cell carcinoma have been demonstrated when cryotherapy with this device is followed by healing of the esophageal lining in a low acid environment.

This study is undertaken to demonstrate the efficacy and safety in the ablation of Barrett's esophagus with high-grade, neoplasia, and severe esophageal squamous dysplasia and to confirm preliminary results in humans.

Inclusion Criteria:

• High Grade-IMCancer:

  • Diagnosis of Barrett's esophagus and high-grade dysplasia or intramucosal carcinoma
  • Deemed inoperable based on the following criteria: co-morbid conditions such as severe heart, lung, kidney or liver disease; or refusal of surgical intervention after a thorough discussion of the highly experimental nature of cryotherapy
  • CT scan of the chest and abdomen with oral and intravenous contrast (unless allergic), demonstrating no evidence of advanced esophageal cancer (extension into or through the wall or lymph node involvement)
  • Endoscopic ultrasound evaluation demonstrating no evidence of metastatic lymph node involvement or extension of carcinoma beyond the mucosa
  • Pathology review of esophageal biopsies by two independent reviewers, including at least one from the Department of Pathology at the University of Maryland, to confirm the diagnosis of Barrett's esophagus with HGD and/or IMCA
  • Presentation and discussion at Thoracic Tumor Board

• Mucosal/submucosal cancer:

  • Diagnosis of esophageal carcinoma
  • Deemed inoperable based on the following criteria: co-morbid conditions such as severe heart, lung, kidney or liver disease; or refusal of surgical intervention after a thorough discussion of the highly experimental nature of cryotherapy
  • CT scan of the chest and abdomen with oral and intravenous contrast (unless allergic), demonstrating no evidence of advanced esophageal cancer (extension through the wall or lymph node involvement)
  • Endoscopic ultrasound evaluation demonstrating no evidence of metastatic lymph node involvement and primary lesion extending into submucosa or muscularis propria (T1smN0 or T2N0)
  • Presentation and discussion at Thoracic Tumor Board
  • Patients who have undergone previous ablation therapies are eligible for this study.

• Severe squamous dysplasia:

  • Diagnosis of severe dysplasia within esophageal squamous mucosa
  • Deemed inoperable based on the following criteria: co-morbid conditions such as severe heart, lung, kidney or liver disease; or refusal of surgical intervention after a thorough discussion of the highly experimental nature of cryotherapy
  • CT scan of the chest and abdomen with oral and intravenous contrast (unless allergic), demonstrating no evidence of advanced esophageal cancer (extension into or through the wall or lymph node involvement)
  • Endoscopic ultrasound evaluation demonstrating no evidence of metastatic lymph node involvement or extension of carcinoma beyond the mucosa
  • Pathology review of esophageal biopsies by two independent reviewers, including at least one from the Department of Pathology at the University of Maryland, to confirm the diagnosis
  • Presentation and discussion at Thoracic Tumor Board

Exclusion Criteria:

• Age less than 18 years
• Co-morbid illness expected to cause death within 6 months
• Pregnancy
• Medically unfit or other contraindication to tolerate upper endoscopy
• Inability to tolerate therapy with a proton pump inhibitor (PPI)
• Refusal or inability to give consent

Participants will have Barrett's esophagus and high grade dysplasia or intramucosal cancer, squamous dysplasia, or mucosal/submucosal cancer