Inclusion Criteria:

- Provision of a signed and dated written informed consent document prior to any study
specific procedures.

- Age ≥18 years, male or female.

- Histologically confirmed NSCLC.

- Specimen tumor tissue obtained from mediastinoscopy

- ECOG Performance status (PS) 0-1.

- Stage IIIA(N2) patients with technical operable disease limited to T1a,b, T2a,b N2
M0; T3 (>7 cm) N2 M0.

- Medically fit for resection by lobectomy or pneumonectomy.

- Radiologically measurable disease (RECIST v1.1 criteria).

- Prior surgery for NSCLC if resected ≥5 years.

- No prior chemotherapy, targeted-therapy, investigational therapy or radiation for
NSCLC.

- No uncontrolled medical problems.

- No superior vena cava syndrome.

- Peripheral neuropathy must be ≤ grade 1.

- Acceptable hematologic and chemistry parameters.

- Creatinine clearance >50 ml/min.

- Female patients or their partners must be surgically sterile or be postmenopausal, or
agree to use effective contraception while in trial treatment and for 3 months
thereafter.

- Female patients with reproductive potential must have a negative pregnancy test
(serum or urine) within 72 hours prior to starting treatment.

- Patients who are willing and able to comply with scheduled visits, treatment plan,
laboratory tests, and other study procedures including patient reported measures.

Exclusion Criteria:

- Any evidence of mixed histology including elements of small cell or carcinoid lung
cancer.

- Stage IIIA patients limited to T3 N1 M0; T3 (invasion) N2 M0; T4 N0, N1 M0.

- Any clinically significant GI abnormalities, which may impair intake, transit or
absorption of gefitinib, such as the inability to take oral medication.

- Current enrollment in another therapeutic clinical trial.

- Any psychiatric or cognitive disorder that would limit the understanding or rendering
of informed consent and/or compromise compliance with the requirements of this study.

- Past medical history of interstitial lung disease, drug-induced interstitial disease,
radiation pneumonitis which required steroid treatment or any evidence of clinically
active interstitial lung disease

- Pre-existing idiopathic pulmonary fibrosis evidence by computerized tomography (CT)
scan at baseline.

- Uncontrolled or significant CV disease, including: myocardial infarction within 12
months; uncontrolled angina within 6 months; congestive heart failure within 6
months; diagnosed or suspected congenital long QT syndrome;

- Any history of clinically significant ventricular arrhythmias (such as ventricular
tachycardia, ventricular fibrillation, or Torsades de pointes);

- Prolonged QTc interval on pre entry ECG.

- Any history of second or third degree heart block (may be eligible if currently have
a pacemaker);

- Heart rate <50/minute on baseline ECG;

- Uncontrolled hypertension.

- Evidence of prior malignancy (other than non melanoma skin cancer or in situ cervical
cancer, or localized and presumed cured prostate cancer with PSA < ULN) within the
last 3 years.

- Other severe acute or chronic medical condition that may increase the risk associated
with trial participation or may interfere with the interpretation of trial results
and, in the judgment of the investigator.

- Patients in whom corticosteroid premedication was contraindicated.

- HIV-positive patients on active treatment.

- Medications are prohibited at baseline and prior to randomization if they affect the
pharmacokinetics of gefitinib, cisplatin, docetaxel, gemcitabine, vinorelbine and
pemetrexed or if they are mainly metabolized by CYP3A4.

- Patients who are otherwise eligible can be enrolled only if drug substitution is
performed with acceptable clinical outcome prior to enrollment: known severe
hypersensitivity to gefitinib or other chemotherapeutic agents or any of the
excipients of the products.

- Pregnancy or breast-feeding.