Please assess the completion status of the following clinical trial:

Trial Title: Study of S-1 in Combination With Radiotherapy in Esophageal Cancer

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE2
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Joined the study voluntarily and signed informed consent form;~* Age \>75 or age 18-75 who are intolerant of or reject intravenous chemotherapy~* Both genders~* Esophageal squamous cell carcinoma confirmed by pathology~* Local advanced esophageal squamous cell carcinoma (T2-4N0-1M0-1a,TxN1M0-1a,TxNxM1a, AJCC 6th)~* No radiotherapy, chemotherapy or other treatments prior to enrollment~* PS ECOG 0-2~* Life expectancy of more than 3 months~* Hemoglobin（Hb）≥9 g/dL~* WBC≥3x109/L, Neutrophils (ANC )≥1.5x109/L~* platelet count (Pt) ≥100x 109/L~* Hepatic function: ALAT and ASAT \< 2.5 x ULN, TBIL\<1.5 x ULN~* Renal function: creatinine \< 1.5 x ULN~* No immuno-deficiency~* Use of an effective contraceptive for adults to prevent pregnancy.~Exclusion Criteria:~* Complete esophageal obstruction~* Deep esophageal ulcer~* Esophageal perforation~* Haematemesis~* After surgery, exploratory thoracotomy, radiotherapy, chemotherapy, or targeting therapy~* Other malignant tumors, except for skin basal cell carcinoma, or cervical carcinoma in situ, who survived with no evidence disease for over 3 years~* Participation in other interventional clinical trials within 30 days~* Pregnant or breast-feeding women or people during the birth-period who refused to take contraceptives~* Drug addiction~* Alcoholism or AIDS~* Uncontrolled seizures or psychiatric diseases, loss of control over their own behavior~* Patient who has metastasis such as lung, liver metastasis

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- S-1 (Type: EXPERIMENTAL): Patients will receive chemoradiation with S-1.~Interventions:~Drug: S-1 Radiation: Radiation therapy

Based on this trial design, predict the completion outcome and termination type (if applicable).