An Early Phase I Study of IPdR Absorption, Metabolism, and Safety in Patients With Advanced Solid Tumors and Lymphomas

Background:

• The nucleoside analog iododeoxyuridine (IdUrd, NSC 39661) has shown promising activity as a radiosensitizer in preclinical models and has been evaluated in Phase I/II clinical trials. The extent of radiosensitization is directly related to the incorporation of IdUrd into tumor DNA as a replacement for thymidine.
• IPdR (NSC 726188) is an orally administered prodrug of IdUrd with a better therapeutic index in preclinical models.
• This first in human study of IPdR will evaluate whether IPdR is absorbed and what plasma levels of IPdR and its major metabolite, IdUrd, are achieved after a single oral dose.

Objectives:

• Measure plasma concentrations of IPdR, IdUrd, and IdUrd metabolites after a single oral dose of IPdR
• Determine the safety of administering a single oral dose of IPdR.

Eligibility:

-Patients must be greater than or equal to 18 years of age and have histologically confirmed solid tumors or lymphoid malignancies refractory to at least one line of standard treatment or for which no standard therapy is available. Patients should have adequate organ function and no disease-associated symptoms requiring immediate therapy or intervention.

Study Design:

• Patients will receive a single oral dose of IPdR on day 1.
• The initial IPdR dose will be 150 mg; dose escalation will be in 100% increments to a maximum of 2400 mg. One patient will be accrued to each dose level until we reach the highest dose level. Six patients will be accrued at dose level 5 (2400 mg).

• INCLUSION CRITERIA:
• Patients must have histologically documented (confirmed at the Laboratory of Pathology, NCI) solid tumors or lymphoid malignancies that are refractory to at least one line of standard treatment or for which no standard therapy is available. Patients with lymphoid malignancies may be enrolled if they have disease for which standard therapy is currently not indicated. Patients should not have disease-associated symptoms requiring immediate therapy or intervention.
• Any prior chemotherapy or radiation therapy must have been completed greater than or equal to 2 weeks prior to enrollment (6 weeks for nitrosoureas or mitomycin C), and the patient must have recovered to eligibility levels from prior toxicity.
• Age greater than or equal to 18 years. Patients under 18 years of age are excluded because of their inability as a protected population to give appropriate consent to this non-therapeutic study.
• ECOG performance status less than or equal to 2 (Karnofsky greater than or equal to 60%).
• Life expectancy of at least 3 months.
• Patients must have normal organ and marrow function as defined below:

• absolute neutrophil count greater than or equal to 1,500/microL
• platelets greater than or equal to 100,000/microL
• total bilirubin less than 1.5 times institutional upper limit of normal (ULN)
• AST(SGOT)/ALT(SGPT) less than or equal to 3.0 times ULN
• creatinine less than 1.5 times ULN

OR:

--creatinine clearance greater than or equal to 60 mL/min for patients with creatinine levels greater than or equal to 1.5 times ULN

• IPdR is a nucleoside analog and therefore potentially teratogenic. Women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry and for 30 days after study drug administration. Because there is an unknown but potential risk for adverse events in nursing infants secondary to IPdR administration to the mother, nursing mothers should not receive IPdR.
• Ability to understand and the willingness to sign a written informed consent document.

Exclusion criteria

• Patients may not be receiving any other investigational agents.
• Uncontrolled intercurrent illness including, but not limited to, ongoing uncontrolled infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, GI conditions limiting absorption, serious skin conditions, or psychiatric illness/social situations that would limit compliance with study requirements.
• Women who are pregnant or nursing.

INCLUSION OF WOMEN AND MINORITIES:

-Both men and women and members of all races and ethnic groups are eligible for this trial.