CPAP for Esophageal Cancer With Radiotherapy

Inclusion Criteria: 1. Diagnosis of cancer, with a tumor (primary or secondary) in the esophagus including tumors in the esophagus-stomach junction. 2. Age ≥ 18 3. Planned RT treatment 4. The level of functioning ≥ 60 on the Karnofsky scale 5. Life expectancy ≥ two months 6. All patients must understand the informed consent form document and sign it of their own free will before any test/procedure related to the study is performed. 7. Able to undergo simulation and radiation with CPAP 8. Candidate patients can be recruited to receive definitive, palliative or pre-operative radiation, with or without chemotherapy. Exclusion Criteria: A person who meets any of the following exclusion criteria will not be able to participate in the study: 1. Pregnancy or breastfeeding 2. Significant comorbidity at the starting point that would prevent the use of CPAP 3. Hospitalized in an institution by virtue of an administrative order or a court order. 4. Special population 5. A history of a psychiatric problem that may impair the patient's ability to understand the research requirements or respond to them, or to give his consent