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A phase I clinical trial of prolonged infusion of hydroxyurea in combination with hyperfractionated, accelerated, external radiation therapy in patients with advanced squamous cell cancer of the head and neck.

Abstract：

BACKGROUND:Preclinical data suggested that sustained inhibition of the anabolic enzyme, ribonucleotide reductase (RR), by hydroxyurea (HU) may be critical for the anticancer effects of the drug. A phase I trial of continuous infusion HU with concomitant hyperfractionated, accelerated radiation therapy (CHU-CHRT) was initiated to determine the maximum tolerated dose (MTD) and dose limiting toxicities (DLT) of HU in patients with locally advanced squamous cell carcinoma (SCC) of the head and neck. METHODS:Patients were required to have histologically-documented and radiographically-staged locally advanced SCC of the hypopharynx (AJC stages II, III or IV), oropharynx (AJC stage IV), or oral cavity (AJC stage IV) not amenable to reasonable surgical resection. Eligible patients had adequate bone marrow, hepatic, and renal function and had to give informed consent. Concomitant, hyperfractionated, accelerated radiation therapy (CHRT) consisted of 1.2 Gy BID (6 hour minimum interfraction interval) on weekdays and 1.2 Gy delivered daily on the weekends to a total tumor dose of 74.4 Gy. Continuous infusion hydroxyurea (CHU) was administered at 0.25-0.375 mg/m2/min as a continuous intravenous infusion daily for 5 days with weekends days off for the duration of the radiation therapy. The dose of HU was increased by 0.125 mg/m2/min between dose levels until DLT was reached in 2/6 patients. If the primary had a complete clinical response and biopsies were negative, planned neck dissections were performed. RESULTS:Fifteen patients were enrolled and are evaluable. The initial dose level, 0.25 mg/m2/min was tolerated by 3/3 patients. At 0.375 mg/m2/min, 3/6 patients experienced grade 3-4 infections, with one patient having a non-fatal, subendocardial infarction. At 0.313 mg/m2/min, no patient experienced DLT. CONCLUSION:The MTD for CHU-CHRT was 0.313 mg/m2/min. The toxicities were primarily mucosal and a phase II study is in progress.

journal_name

Invest New Drugs

journal_title

Investigational new drugs

authors

Beitler JJ,Smith RV,Haynes H,Silver CE,Quish A,Kotz T,Serrano M,Brook A,Wadler S

doi

10.1023/a:1006102716920

subject

Has Abstract

pub_date

1998-01-01 00:00:00

pages

161-9

issue

eissn

0167-6997

issn

1573-0646

journal_volume

pub_type

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A phase I clinical trial of prolonged infusion of hydroxyurea in combination with hyperfractionated, accelerated, external radiation therapy in patients with advanced squamous cell cancer of the head and neck.