Radiation Therapy vs. Observation Following Gemcitabine and Cisplatin for Inoperable Localized Liver Cancer

Inclusion Criteria:

1. Pathologically (histologically or cytologically) proven diagnosis of intrahepatic cholangiocarcinoma (IHC) without distant extrahepatic metastasis prior to study entry. Patients with an adenocarcinoma suggestive of a pancreaticobiliary primary with radiographic findings consistent with an intrahepatic cholangio-carcinoma are eligible.
2. Patient must have 1 lesion with a maximum AXIAL diameter of 12cm at the time of study entry. Up to 3 satellite lesions are permitted. Satellite lesions, are defined as lesions less than 2 cm that are within 1 cm of the periphery of the dominant lesion (gross tumor volume \[GTV\]) are permitted. The satellite lesions are NOT included in the AXIAL diameter measurement. Regional Lymph Node involvement within the porta hepatis (as medial as superior mesenteric vein \[SMV\] portal vein confluence) is permitted if nodes are deemed clinically positive (i.e. FDG \[Fluorine 18 fluorodeoxyglucose\] avid);
3. Appropriate stage for protocol entry, including no distant metastases, based upon the following minimum diagnostic workup:

   • Pre-study entry Scan (REQUIRED for All Patients to confirm no progression): computed tomography (CT) scan chest/abdomen/pelvis with multiphasic liver CT scan within 30 days prior to study entry. If CT contrast is contraindicated, CT chest without contrast and MRI of abdomen and pelvis is permitted;
4. Zubrod Performance Status 0-1 at the time of study entry;
5. Age ≥ 18;
6. Complete blood count (CBC) / differential obtained within 21 days prior to study entry, with adequate bone marrow function defined as follows:

   * Absolute neutrophil count (ANC) ≥ 1,000 cells/mm3;
   * Platelets ≥ 75,000 cells/mm3;
   * Total bilirubin \< 2.5 mg/dl;
   * Aspartate Aminotransferase (AST) (serum glutamic oxaloacetic transaminase \[SGOT\]) and alanine aminotransferase (ALT) (Serum glutamic pyruvic transaminase \[SGPT\]) \< 5.0 X institutional upper limit of normal;
   * Albumin ≥ 2.5mg/dl;
   * Creatinine within normal institutional limits or creatinine clearance ≥ 60 mL/min/1.73 m2 for subject with creatinine levels above institutional normal;
   * Hemoglobin(Hgb) ≥ 9.0 g/dl. (Note: The use of transfusion or other intervention to achieve Hgb ≥ 9.0 g/dl is acceptable.)
7. Patient must provide study specific informed consent prior to study entry;
8. Negative Beta-Human Chorionic Gonadotropin (bHCG) prior to study entry if patient is pre or peri-menopausal.
9. Must have received 6 months of Gemcitabine/Cisplatin chemotherapy without progression. Disease response to chemotherapy is also permitted. If toxicity precludes 6 months of chemotherapy at least 4 months of Gemcitabine/Cisplatin must have been administered.

Exclusion Criteria:

1. Multiple lesions that don't meet the criteria as satellite lesions as defined in protocol;
2. Extrahepatic metastases or malignant nodes beyond the periportal region. Celiac, pancreaticoduodenal and para-aortic nodes\> 2 cm are ineligible. Note that benign non-enhancing periportal lymphadenopathy is not unusual in the presence of hepatitis and is permitted, even if the sum of enlarged nodes is \> 2.0 cm;
3. Hepatic insufficiency resulting in clinical jaundice, encephalopathy and/or variceal bleed at the time of study entry;
4. Prior radiotherapy to the region of the liver that would result in overlap of radiation therapy fields;
5. Prior selective internal radiotherapy/hepatic arterial Yttrium therapy, at any time;
6. Direct tumor extension into the stomach, duodenum, small bowel or large bowel;
7. Prior invasive malignancy, excluding the current diagnosis, (except non-melanomatous skin cancer) unless disease free for a minimum of 3 years. (Note: carcinoma in situ of the breast, oral cavity, or cervix is all permissible);
8. Prior systemic chemotherapy for the study cancer other than gemcitabine/cisplatin; note that prior chemotherapy for a different cancer is allowable;
9. Currently receiving other anti-cancer agents;
10. Participants who require anticoagulation should receive low-molecular weight or standard heparin and not warfarin;
11. Prior surgery for the IHC. (Liver resection is not allowed);
12. Severe, active co-morbidity, defined as follows:

    * Unstable angina and/or congestive heart failure requiring hospitalization within the last 6 months of study entry;
    * Transmural myocardial infarction within the last 6 months of study entry;
    * Acute bacterial or fungal infection requiring intravenous antibiotics at the time of study entry;
    * Chronic Obstructive Pulmonary Disease exacerbation or other respiratory illness requiring hospitalization or precluding study therapy within 30 days prior to study entry;
    * HIV positive with CD4 (cluster of differentiation 4) count \< 200 cells/microliter. Note that patients who are HIV positive are eligible, provided they are under treatment with highly active antiretroviral therapy (HAART) and have a CD4 count ≥ 200 cells/microliter at the time of study entry. Note also that HIV testing is not required for eligibility for this protocol;
    * End-stage renal disease (ie, on dialysis or dialysis has been recommended).
13. Pregnancy or women of childbearing potential and men who are sexually active and not willing/able to use medically acceptable forms of contraception; this exclusion is necessary because the treatment involved in this study may be significantly teratogenic;
14. Grade 3 or higher peripheral neuropathy at the time of study entry.