Inclusion Criteria:

Inclusion Criteria for patients´ screening:

- Patients of both sexes aged 18 or more.

- Histologically confirmed advanced or metastatic Non-Small-Cell Lung Cancer (NSCLC)
(patients stage III B unsuitable for locoregional treatment, and stage IV).

- Chemo- naïve patients (Non-Small-Cell Lung Cancer patients who have not received
first line systemic cytotoxic chemotherapy).

- Patients with available tumoral tissue (primary tumor or metastatic area) or
cytological samples including fine needle aspirates (primary tumor or metastatic
area), bronchial alveolar lavage or bronchial scrapings and pleural effusion.

- Patients who have granted their written informed consent.

Patients must fulfill the inclusion criteria previously mentioned and the following one in
order to be enrolled in the study (visit 1) for the follow-up until progression or until 9
months from the beginning of treatment have elapsed:

Inclusion Criteria for patients´ follow-up

- Patients with documented positive mutation in epidermal growth factor receptor (EGFR)
(M+).

Exclusion Criteria:

- Combined histology of non-small cell and small cell lung cancer.