DISEASE CHARACTERISTICS:

• Histologically or cytologically confirmed adenocarcinoma of the pancreas

  • Locally advanced or metastatic disease

• Unidimensionally measurable disease

  • At least 1 lesion that is at least 20 mm with conventional techniques or at least 10 mm with spiral CT scan
• Must have progressed after chemotherapy with a gemcitabine-containing regimen
• No known brain metastases

PATIENT CHARACTERISTICS:

Age

• Over 18

Performance status

• ECOG 0-1

Life expectancy

• Not specified

Hematopoietic

• WBC at least 3,000/mm^3
• Absolute neutrophil count at least 1,500/mm^3
• Platelet count at least 100,000/mm^3

Hepatic

• Bilirubin no greater than 1.5 mg/dL
• AST/ALT no greater than 5 times upper limit of normal

Renal

• Creatinine no greater than 1.5 mg/dL OR
• Creatinine clearance at least 60 mL/min

Cardiovascular

• QTc less than 500 msec at baseline by EKG
• No New York Heart Association class III or IV heart failure
• No symptomatic congestive heart failure
• No unstable angina pectoris
• No cardiac arrhythmia

Other

• Not pregnant or nursing
• Negative pregnancy test
• Fertile patients must use effective contraception
• No prior allergic reactions attributed to compounds of similar chemical or biological composition to arsenic trioxide
• No other active malignancy within the past 5 years except nonmelanoma skin cancer or carcinoma in situ of the cervix
• No ongoing or active infection
• No psychiatric illness or social situation that would preclude study compliance
• No other uncontrolled illness

PRIOR CONCURRENT THERAPY:

Biologic therapy

• No concurrent immunotherapy
• No concurrent colony-stimulating factors during the first course of the study

Chemotherapy

• See Disease Characteristics
• At least 4 weeks since prior chemotherapy (6 weeks for nitrosoureas or mitomycin) and recovered
• No prior arsenic trioxide
• No other concurrent chemotherapy
• No more than 1 prior chemotherapy regimen for metastatic disease

Endocrine therapy

• No concurrent hormonal therapy

Radiotherapy

• At least 4 weeks since prior radiotherapy and recovered
• No concurrent therapeutic radiotherapy

Surgery

• At least 4 weeks since major surgery

Other

• No other concurrent investigational or commercial anticancer agents or therapies
• No other concurrent investigational agents
• No concurrent antiretroviral therapy in HIV-positive patients
• No concurrent medications for other comorbid conditions that are known to prolong the QT interval