• Physical Examination (including neurosensory assessment)before Day 1 of each cycle and 30-day Post Treatment Evaluation
• Weight before Day 1 of each cycle and 30-day Post Treatment Evaluation
• ECOG performance status before Day 1 of each cycle and 30-day Post Treatment Evaluation
• Hematology before Day 1 of each cycle and 30-day Post Treatment Evaluation
• Biochemistry before Day 1 of each cycle and 30-day Post Treatment Evaluation
• Toxicity assessment before Day 1 of each cycle and 30-day Post Treatment Evaluation
• Chest x-ray every 3 cycles and 30-day Post Treatment Evaluation
• Diagnostic imaging for tumor assessment every 3 cycles and 30-day Post Treatment Evaluation

This is a Phase II trial of the combination of oxaliplatin (Eloxatin) and capecitabine (Xeloda), known as XELOX, in patients with unresectable or recurrent cholangiocarcinoma, including carcinoma of the gallbladder or biliary tract, both intrahepatic and extrahepatic. Patients may be either previously untreated or treated with chemotherapy. Patients will accrue to two strata based on pre-treatment status; separate response rates and statistical operating characteristics will be applied to each stratum.

The primary objective is to determine the objective response rate (complete plus partial) of XELOX in this population.

Secondary objectives include determining toxicity, stable disease rates, and median and overall survival of patients treated with this combination.

Oxaliplatin causes death of cancer cells and other actively dividing cells by interfering with DNA function. Capecitabine causes death of cancer cells by interfering with certain molecules that are important in cell division.

If the study doctor thinks that you may be eligible to be enrolled onto this study, and you agree to take part, it will be necessary to perform some medical tests and procedures in order to confirm that you qualify for the study treatment. This is called the "screening" portion of the study. After the screening portion of the study, you may not be eligible to continue on the study.

For the screening portion of the study, you will be asked questions about your medical history. You will have a complete physical exam (including neurological exam) and your vital signs, height, and weight will be measured. How well you are able to perform daily activities will be evaluated. You will have an electrocardiogram (ECG - a test that measures the electrical activity of the heart) and a chest x-ray. You will have a blood (about 2-3 teaspoons) sample collected for routine tests. You will have either a CT scan or a MRI done to check on the size and location of the tumor(s). Women who are able to have children must have a negative blood pregnancy test before starting this study.

After the screening portion of the study, if you are eligible to continue, you will begin treatment with oxaliplatin and capecitabine. Once treatment begins, you will come to M. D. Anderson at least every three weeks (21 days) for treatment. Each 21-day period of treatment is called a "cycle" of therapy. You will receive at least 3 cycles of therapy unless side effects are severe or the cancer grows very quickly.

You will need to have a small tube (central venous line) inserted into a large vein under the skin of the chest or through a vein in the arm to receive oxaliplatin. The central venous line will remain in place the entire time you are taking part in this study. Oxaliplatin must be given at M. D. Anderson. On Day 1 of each cycle, you will receive oxaliplatin injected into a vein over 2 hours.

You will take capecitabine tablets by mouth 2 times a day for the first 2 weeks (Days 1-14) of each 3-week cycle. No treatment will be given for the last 7 days of each cycle (except if your first dose of capecitabine for a new cycle is taken in the evening, your last dose will be taken in the morning of Day 15.) You must take capecitabine within 30 minutes after breakfast and dinner. The morning and evening doses should be about 12 hours apart. You should take capecitabine with water, and not with fruit juices. At the first treatment visit and every 3 weeks, you will receive enough capecitabine to last until the next visit. At each visit, you must return any capecitabine you have not used as well as all empty bottles.

Before each new cycle of therapy, you will have a complete physical exam and blood (about 2 ½ teaspoons) will be collected for routine tests. You will be asked to tell the study doctor about all medications you have taken since you started taking the study drugs and any health problems that you may have experienced. During the first cycle, you will have a blood (about 2 teaspoons) sample collected each week for routine tests. You will also have either CT scans or a MRI of the tumor(s) every 9 weeks and at the end of the study. Additional tests may be done during the study if your doctor feels it is necessary for your care.

If you experience severe side effects, treatment may be delayed, stopped, or you may receive smaller doses of the treatment. You may continue to receive treatment on this study until the disease gets worse or you experience any intolerable side effects. If this happens, you will be taken off the study and your doctor will discuss other treatment options with you.

When you stop taking part in the study, you will have blood (about 3 teaspoons) collected for routine tests. You will have a physical exam and either a CT scan or a MRI to check on the status of the disease. You will be contacted by phone every three months for the rest of your life to check on the status of the disease and on any symptoms you may be experiencing.

All tests before each new cycle of treatment and when treatment stops must be done at M. D. Anderson.

This is an investigational study. The drugs oxaliplatin and capecitabine are FDA approved for treatment of advanced cancer of the colon or rectum. However, the drugs are not approved for gallbladder or biliary tract cancer. Up to 50 participants will take part in this study. All will be enrolled at M. D. Anderson.

• Cancer of the Gallbladder
• Cancer of the Biliary Tract

• Drug: Capecitabine
• Drug: Oxaliplatin

Inclusion Criteria:

• Patients must have histologically confirmed carcinoma of the gallbladder, intrahepatic or extrahepatic biliary tract, not amenable to resection with curative intent.
• Patients must have measurable disease as per the modified RECIST criteria, defined as at least one lesion that can be accurately measured in at least one dimension, with minimum lesion size equal to or more than twice the slice thickness of the imaging study used.
• Patients who are previously untreated as well as those who have received prior therapy are eligible to participate in this study. Patients may have received up to a total of two prior chemotherapy regimens for their disease, including biologic therapy(ies). The same regimen may have been received at different times during the course of the patient's treatment. Surgery, radiofrequency ablation, external beam radiotherapy, or other directed therapies do not count as prior regimens and are allowed.
• Previous treatment may include systemic chemotherapy, however, prior capecitabine (unless administered as a radiosensitizing agent concurrently with prior external beam radiotherapy) or oxaliplatin are excluded.
• If radiation was previously received, the measurable disease must be recurrent or metastatic disease outside the previous radiation field.
• A minimum of 4 weeks must have elapsed since completion of any prior chemotherapy or radiotherapy.
• Patients should have a life expectancy of at least 16 weeks based on the clinical judgment of the Investigator.
• ECOG Performance Status of </= 2 or Karnofsky > 70.
• Adequate bone marrow function defined as absolute peripheral granulocyte count of >/= 1500/mm3, platelet count >/= 100,000/ mm3, and hemoglobin >/= 10 gm/dL.
• Adequate renal function, defined as serum creatinine </= 1.5 X ULN institutional normal and calculated creatinine clearance >30 mL/min (using Cockcroft and Gault formula-Appendix B).
• Patients must have adequate hepatic function: total bilirubin </= 2.0 gm/dL; serum albumin >/= 2.5 gm/dL; transaminases up to 5 X the upper limit of institutional normal value; or prothrombin time prolonged up to 2 seconds greater than the institutional normal value.
• Negative serum pregnancy test in women with childbearing potential.
• The effects of the combination of oxaliplatin and capecitabine on the developing fetus are unknown. For this reason, women of childbearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control) prior to study entry and for the duration of study participation. Should a woman become pregnant while participating in this study, she should inform her treating physician immediately.
• Patients must sign an Informed Consent and Authorization indicating that they are aware of the investigational nature of this study and the known risks involved. The consent form appended to this protocol must be used to document patient consent.
• Age >/=18 years.
• Patients taking therapeutic dose-levels of coumarin-derivate anticoagulants should be switched to low LMWH. Low-dose coumadin (e.g. 1 mg po per day) in patients with in-dwelling venous access devices, is allowed.

Exclusion Criteria:

• Prior therapy with oxaliplatin or capecitabine; capecitabine administered as a radiosensitizing agent concurrently with prior external beam radiotherapy is allowable.
• Patients who have had chemotherapy within 4 weeks (6 weeks for nitrosoureas or Mitomycin C) prior to entering the study or those who have not recovered from adverse events due to agents administered more than 4 weeks earlier.
• Patients may not be receiving any other investigational agents nor have received any investigational drug </= 30 days prior to enrollment.
• Patients with known brain metastases should be excluded from this clinical trial because of their poor prognosis and because they often develop progressive neurologic dysfunction that would confound the evaluation of neurologic and other adverse events.
• Gastrointestinal tract disease resulting in an inability to take oral medication or a requirement for IV alimentation, prior surgical therapy affecting absorption.
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements.
• Because patients with immune deficiency are at increased risk of lethal infections when treated with marrow-suppressive therapy, HIV-positive patients receiving combination anti-retroviral therapy are excluded from the study because of possible pharmacokinetic interactions with XELOX. Appropriate studies will be undertaken in patients receiving combination anti-retroviral therapy when indicated.
• Patients with extensive symptomatic fibrosis of the lungs.
• Peripheral neuropathy > grade 1.
• Known DPD deficiency.
• Patients receiving therapeutic doses of coumarin-derivative anticoagulant therapy are excluded since a drug interaction between capecitabine and coumarin anticoagulants has been reported. Patients requiring anticoagulation who may be safely switched to LMWH are eligible.