AZD2171 + Chemotherapy in Advanced NSCLC, Colorectal Cancer, or Other Cancer Suitable for Treatment With Capecitabine (Non-Small Lung Cancer Patients Closed to Enrollment as 8/9/07)

DISEASE CHARACTERISTICS: * Histologically or cytologically confirmed diagnosis of 1 of the following: * Non-small cell lung cancer (NSCLC) (closed to accrual as of 8/9/07) meeting 1 of the following stage criteria: * Stage IIIB disease * Patients without pleural effusion who are not candidates for combined modality treatment OR who were treated at centers where combined modality treatment is not considered standard treatment are eligible * Stage IV disease * Local or metastatic failure after prior surgery and/or radiotherapy * Colorectal cancer * Metastatic disease * Considered suitable for first-line therapy with capecitabine * Other tumor types * Suitable for treatment with capecitabine * No more than 2 prior chemotherapy regimens for advanced or metastatic disease * Incurable by radiotherapy or surgery * Clinically or radiologically documented disease * No tumor marker elevation as the only evidence of disease * No necrotic or hemorrhagic tumor or metastases * No untreated brain or meningeal metastases * Patients with previously treated stable brain metastases (by radiography or clinical exam) are eligible provided they are asymptomatic and do not require corticosteroids PATIENT CHARACTERISTICS: Age * 18 and over Performance status * ECOG 0-2 Life expectancy * At least 12 weeks (colorectal cancer patients) Hematopoietic * Hemoglobin adequate * Anemia allowed provided patient is well compensated with no evidenc…