Inclusion Criteria:

- Histologic or cytologic diagnosis of NSCLC Stage IIIB (with pleural effusion and/or
positive supraclavicular lymph nodes) or Stage IV prior to induction therapy.

- Patients must have had one of the following induction therapies for treatment for
Stage IIIB (with pleural effusion and/or positive supraclavicular lymph nodes) or IV
NSCLC: Gemcitabine plus carboplatin, paclitaxel plus carboplatin, or docetaxel plus
carboplatin, gemcitabine plus cisplatin, paclitaxel plus cisplatin or docetaxel plus
cisplatin.

- Patients must have received only one chemotherapeutic doublet lasting precisely four
cycles.

- Induction regimens must be based on 21-day cycles.

- Documented evidence of a tumor response of CR, PR or SD. Tumor assessment must occur
between Cycle 4 (Day 1) of induction therapy and the date of randomization. This
response does not have to be confirmed in order for the patient to be randomized.
(Positron emission tomography (PET) scans and ultrasounds may not be used for lesion
measurements for response determination.

Exclusion Criteria:

- With the exception of those chemotherapies listed as inclusion criterion, patients
will not be included if they have received prior systemic anticancer therapy
(including adjuvant early-stage treatment for NSCLC) or any systemic treatment for
any other cancer.

- Have received treatment within the last 30 days with a drug that has not received
regulatory approval for any indication at the time of study entry.

- Inability to comply with protocol or study procedures.

- A serious concomitant systemic disorder that would compromise the patient's ability
to complete the study.

- A serious cardiac condition, such as myocardial infarction within 6 months, angina,
or heart disease, as defined by the New York Heart Association Class III or IV.