Inclusion Criteria

Inclusion criteria:

Phase II step;

1. Patients with pathologic confirmation of NSCLC with tissue diagnosis or cytologic
diagnosis, whose NSCLCs are locally advanced or metastatic Stage III-B / IV
adenocarcinoma, and are inoperable and incurable with radiotherapy.

2. Patients who have received the following pretreatments for the treatment of relapsed
or metastatic NSCLC.

- Patients who have received at least one but not more than two lines of
chemotherapy. ("Chemotherapy" means only the first line (doublet chemotherapies
including a platinum) and/or the second line (single chemotherapy except for a
platinum) of cytotoxic chemotherapy according to the standard chemotherapies,
and erlotinib (Tarceva®) and gefitinib (Iressa®) should be excluded. One of the
chemotherapy regimens must have been platinum-based. In addition, only one prior
cytotoxic chemotherapy treatment regimen is allowed after adjuvant chemotherapy
containing a platinum. More than two prior cytotoxic chemotherapy treatment
regimens are not allowed.)

- After the above chemotherapies, patients who once got clinical benefits (i.e.
complete response, partial response or stable disease) but progressed following
at least 12 weeks of treatment with erlotinib (Tarceva®) or gefitinib (Iressa®)
as the most recent treatment. ("Clinical benefit" and "progression" should be
confirmed by computed tomography (CT) or magnetic resonance imaging (MRI). In
addition, "at least 12 weeks of treatment" should be 9 weeks or more as the
actual "treatment period except for treatment pause due to adverse events and
other reasons.) As long as the treatment is erlotinib or gefitinib monotherapy,
patients can receive multiple regimens of either or both treatments, but one of
the regimens should be for at least 12 weeks

3. Male or female patients age >=20 years at the enrolment.

4. Life expectancy of at least three (3) months after the start of administration of the
investigational drug.

5. Eastern Cooperative Oncology Group (ECOG) performance Score 0 or 1.

6. Patients with at least one tumor lesion that can accurately be measured by CT or MRI
in at least one dimension with longest diameter to be recorded as no less than double
the slice thickness and >=10 mm.

7. Written informed consent that is consistent with ICH-GCP guidelines.

Exclusion criteria:

Phase II step;

1. Use of erlotinib (Tarceva®) or gefitinib (Iressa®) within two weeks before starting
the study medication.

2. Patients who have received definitive thoracic radiotherapy with curative intent.
Patients who have received radiotherapy or other investigational drugs
(non-oncological) within four weeks before enrolment.

3. Significant gastrointestinal disorders with diarrhea as a major symptom e.g., Crohn's
disease, mal-absorption, or CTCAE Grade >2 diarrhea of any etiology at the enrolment.

4. Patients with distinct / suspected pulmonary fibrosis or interstitial lung disease by
the chest radiographic findings, or patients with a previous history of.

5. Brain tumor, and / or brain metastases, which are symptomatic or requiring treatment
at the enrolment.

6. Other malignancies diagnosed within the past five years (other than carcinoma in situ
of gastric cancer, colon cancer and cervical cancer, and non melanomatous skin
cancer).

7. History of uncontrolled cardiac disease such as angina or myocardial infarction
within the past 6 months at the enrolment, congestive heart failure including New
York Heart Association (NYHA) functional classification of 3, or arrhythmia requiring
treatment.

8. Coelomic fluid retention (such as pleural effusion, ascites or pericardial effusion)
requiring treatment.

9. Uncontrolled concomitant diseases (e.g. diabetes mellitus, hypertension etc).

10. History of serious drug hypersensitivity.

11. Patients who do not have sufficient baseline organ function and whose laboratory data
do not meet the following criteria at the enrolment.11

- Haemoglobin count >=9.0 g/dL

- Absolute neutrophil count (ANC) >=1500 / mm3

- Platelet count >=100 000 / mm3

- Serum creatinine <=1.5 mg/dL

- Total bilirubin <=1.5 mg/dL

- Aspartate aminotransferase (AST) and / or alanine aminotransferase (ALT) <=2.5x
upper limit of normal range (if related to liver metastases <=2.5x upper limit
of normal also)

- PaO2 >=60torr or SpO2 >=92%

- LVEF as measured by echocardiography or multigated blood pool imaging of the
heart (MUGA scan) >=50%

- QTc interval <0.47 second

12. Patients who disagree with using a medically acceptable method of contraception
during the administration of the investigational drug and for at least 6 months after
the end of administration.

13. Pregnant or breast-feeding women, or women suspected of being pregnant.

14. Known positive HBs antigen, HCV antibody, or HIV antibody test.

15. Known or suspected active drug or alcohol abuse.

16. Other patients judged ineligible for enrolment in the study by the investigator
(sub-investigator).