Adenocarcinoma/therapy; Antineoplastic Agents, Phytogenic/therapeutic use; Carcinoma, Squamous Cell/therapy; Esophageal Neoplasms/therapy; Radiotherapy, High-Energy; Taxoids/therapeutic use; Adenocarcinoma/drug therapy; Adenocarcinoma/mortality; Adenocarcinoma/radiotherapy; Adult; Aged; Aged, 80 and over; Antineoplastic Agents, Phytogenic/administration & dosage; Antineoplastic Agents, Phytogenic/adverse effects; Carcinoma, Squamous Cell/drug therapy; Carcinoma, Squamous Cell/mortality; Carcinoma, Squamous Cell/radiotherapy; Combined Modality Therapy; Comorbidity; Docetaxel; Drug Administration Schedule; Esophageal Neoplasms/drug therapy; Esophageal Neoplasms/mortality; Esophageal Neoplasms/radiotherapy; Esophagitis/etiology; Female; Hematologic Diseases/etiology; Humans; Kaplan-Meier Estimate; Male; Middle Aged; Prognosis; Radiation Pneumonitis/etiology; Radiotherapy, High-Energy/adverse effects; Remission Induction; Survival Analysis; Taxoids/administration & dosage; Taxoids/adverse effects; Treatment Outcome