The goal of this clinical research study is to learn if ZD1839 (Iressa®, gefitinib can help to shrink or slow the growth of advanced, recurrent, or metastatic salivary gland cancer. The safety of this drug will also be studied.

Epidermal growth factor receptor (EGFR) may be involved in certain types of cancer, including squamous cell carcinoma of the skin. When EGFR is stimulated, a series of chemical reactions starts that results in a tumor being "told" to grow. ZD1839 (Iressa® or Gefitinib) tries to stop these reactions by blocking EGFR. This may stop tumors from growing.

If you are eligible to take part in this study, you will take gefitinib treatment by mouth once a day, every day, at about the same time in the morning. It can be taken with or without food. If you forget to take a dose, the last missed dose should be taken as soon as you remember, as long as it is at least 12 hours before the next dose is due to be taken.

Every four weeks during treatment, you will have a physical exam and blood (around 3-4 teaspoons) will be collected for routine tests. If you have skin lesions, the lesions will be measured and photographed for research purposes. You cannot be identified from the pictures. You will also be asked about any side effects you may be experiencing. If your doctor feels it is necessary, you may have more frequent check-ups.

Every eight weeks during treatment, you will have imaging tests. The imaging tests include, a chest x-ray and a CT scan or MRI of the head and neck area. You may also have CT scans of other areas of the body. These tests are being done to check on the status of the disease.

You will continue to take gefitinib as long as the disease is responding to treatment. If at any time during the study the disease becomes worse or you experience any intolerable side effects, you will be taken off the study and your doctor will discuss other treatment options with you.

Sometimes, new information becomes available that may influence your decision to continue in the study. The following new information is available:

Results from two large studies showed that there was no benefit from adding gefitinib to chemotherapy with platinum and one other chemotherapy drug when given as the first treatment for non-small cell lung cancer (NSCLC). Therefore, gefitinib is not approved for use in combination with chemotherapy in the treatment of NSCLC.

This is an investigational study. The FDA has authorized gefitinib for use in cancer research. Up to 80 patients will take part in this study. All will be enrolled at M. D. Anderson.

Inclusion Criteria:

1. Histologically or cytologically confirmed salivary gland carcinoma.
2. Patients with advanced or recurrent salivary gland cancer who are not candidates for curative surgery or radiotherapy.
3. Measurable disease per the RECIST criteria. For disease occurring in previously irradiated field, there must be confirmed progression prior to the date registration and more than three months after completion of radiotherapy
4. Eastern Cooperative Oncology Group (ECOG) performance status 0-2.
5. Prior central nervous system (CNS) involvement by tumor is permissible if previously treated and clinically stable for two weeks after completion of treatment.
6. At least a 2-week recovery from prior therapy toxicity.
7. Provision of written informed consent.
8. Childbearing potential either terminated by surgery, radiation, or menopause, or attenuated by use of an approved contraceptive method (IUD, birth control pills, or barrier device) during and for 3 months after completion of trial therapy.

Exclusion Criteria:

1. Known severe hypersensitivity to or any of the excipients of this product.
2. Other coexisting malignancies or malignancies diagnosed within the last 5 years, with the exception of basal cell carcinoma, squamous cell carcinoma of the skin, or cervical cancer in situ.
3. Concomitant use of phenytoin, carbamazepine, rifampicin, phenobarbital, or St John's Wort or CYP3A4 (e.g. itraconazole, ketoconazole)
4. Treatment with a investigational drug within 28 days before Day 1 of trial treatment.
5. Any unresolved chronic toxicity greater than CTC grade 2 from previous anticancer therapy (except alopecia)
6. Incomplete healing from previous surgery.
7. Serum creatinine level greater than CTC grade 2.
8. Women who are pregnant or breast feeding.
9. Prior or other EGFR inhibiting agents.
10. Serum bilirubin greater than 1.25 times the upper limit of reference range (ULRR).
11. Any evidence of severe or uncontrolled systemic disease (e.g., unstable or uncompensated respiratory, cardiac, hepatic, or renal disease).
12. Alanine amino transferase (ALT) or aspartate amino transferase (AST) greater than 2.5 times the ULRR if no demonstrable liver metastases or greater than 5 times the ULRR in the presence of liver metastases.
13. Evidence of any other significant clinical disorder or laboratory finding that makes it undesirable for the patient to participate in the trial.
14. Uncontrolled seizure disorder, active neurological disease, or greater than Grade 2 neuropathy.
15. Keratoconjunctivitis sicca or incompletely treated eye infection.
16. Abnormal marrow function as defined as absolute neutrophil count <1,500/ul or platelets <100,000/ul.
17. Second primary malignancy (except in situ carcinoma of the cervix or adequately treated nonmelanomatous carcinoma of the skin or other malignancy treated at least 3 years previously with no evidence of recurrence; prior low grade [Gleason score less than 6] localized prostate cancer is allowed).

Adverse events collected every four weeks during treatment at regular assessment, participation expected up to 12 months.