Local Non-salvage Radiotherapy for Synchronous Oligometastatic Non-small-cell Lung Cancer.

Inclusion Criteria:

1. Male or female aged 18 to 70 years old;
2. Histologically or cytologically confirmed non-small cell lung cancer;
3. Stage IV patients with measurable primary tumor and distant metastases number ≤5；
4. PS score 0-2；
5. Have never received local or systemic anti-cancer treatment, including surgery (biopsy is allowed), first line chemotherapy, targeted therapy or immunotherapy;
6. Life expectancy of >3 months;
7. Organ function levels must meet the following requirements:

(1)Bone marrow: White blood cell (WBC)≥4.0G/L；neutrophile granulocyte (NEU)≥1.5G/L；platelets (PLT)≥100G/L; hemoglobin (HGB)≥9g/L； (2)Liver and kidney: total bilirubin (TBIL), aspartate aminotransferase (AST), alanine aminotransferase (ALT)≤2.0 × the upper limit of normal (ULN)；creatinine≤1.5×ULN; 8.Patient must be willing and able to provide written informed consent.

Exclusion Criteria:

1. The amount of metastatic focus >5;
2. Patient can't tolerate chemotherapy or targeted therapy;
3. Local or systemic anti-cancer treatment had been used for the primary foci and metastatic lymph nodes, including surgery (biopsy is allowed), first line chemotherapy, targeted therapy or immunotherapy;
4. Previous or concurrent suffered from other malignancies;
5. Concurrent with other serious disease that can not be controlled;
6. Women who are breast-feeding or pregnant;
7. Have an allergy to pemetrexed, cisplatin, taxanes, targeted medicine and contrast agent;
8. Patients with poor obedience or researchers think that the patient may not be able to accomplish the whole trial.