Recurrent Head and Neck Cancer Clinical Trial
Official title:
Phase 1/2, Open-label Study Evaluating Safety of Repeat Administration of Ad/PNP-F-araAMP (Ad/PNP Administered Intratumorally Followed by Intravenous Fludarabine Phosphate) in Subjects With Recurrent, Local Head and Neck Cancer
Primary Objective: The primary objective of the study is to evaluate the safety of repeat administration of a dose level of Ad/PNP plus fludarabine phosphate (F-araAMP) which demonstrated anti-tumor activity in patients with advanced head and neck cancer in a completed phase I study. Secondary Objective: The secondary objective is to evaluate the antitumor activity of repeat administration of Ad/PNP plus F-araAMP. FDA Office of Orphan Drugs Division is a source of funding for the overall project.
1. Mechanism of action. The study drug, Ad/PNP-F-araAMP (Fludarabine phosphate) consists of a nonreplicating adenoviral vector expressing the E. coli purine nucleoside phosphorylase (PNP) injected intratumorally followed by intravenous administration of F-araAMP. This combination generates 2-fluoroadenine (F-Ade) within the tumor resulting in focal chemotherapeutic activity. F-araAMP is an agent that is rapidly cleaved by plasma phosphatases to fludarabine, which is the primary circulating form of the drug and has activity against certain hematological malignancies, but not against solid tumors such as head and neck squamous cell carcinoma (HNSCC). Fludarabine (F-araA) is an adenosine analog and substrate for E. coli PNP, which cleaves the glycosidic bond of F-araA to generate F-Ade. The F-Ade metabolite has shown pronounced activity against human tumor xenografts in mice. Many refractory tumors are refractory precisely because they have a very low growth fraction, i.e., a relatively small percentage of tumor cells dividing at any particular point in time. In nonclinical studies, significant in vivo antitumor activity has been demonstrated by F-Ade generation from F-araAMP in tumors in which 2.5 to 10% of cells express the E. coli PNP gene. In addition, anti-tumor effect was seen in patients with advanced solid tumors (melanoma and head and neck cancer) in the higher dose cohorts during a Phase 1 study (see next section). 2. Tumor response with Ad/PNP-F-araAMP in Phase 1 Study. The safety and efficacy of Ad/PNP-F-araAMP has been evaluated in a Phase 1 study, PNP-001. Four escalating dose levels were evaluated in 10 subjects with head and neck cancer and 2 subjects with melanoma; clinical activity was observed at the highest dose levels following 3 intratumoral injections of Ad/PNP over 2 days and IV F-araAMP phosphate over 3 days. The overall response rate (CR+PR) was approximately 67% in the 2 highest dose cohorts, Cohorts 3 and 4. Results suggest a dose response effect. The duration of response in the injected tumor was limited, with 4 of 5 responding tumors having disease progression of the injected lesion prior to last follow-up on Day 56, suggesting that repeat administration should be evaluated. Ad/PNP + F-araAMP was well tolerated. No subject experienced a dose-limiting toxicity and none of the subjects discontinued study treatment. Overall, the activity and safety profile of Ad/PNP seen in the Phase 1 study supports further clinical evaluation of repeat administration of Ad/PNP (IT) and F-araAMP phosphate infusion for patients with HNSCC. 3. Purpose of the Study. Based upon the tumor response seen with a single administration of the two highest dose levels of Ad/PNP-F-araAMP in the Phase 1 study, PNP plans to investigate the safety and assess anti-tumor activity of repeat cycles of injection of Ad/PNP + F-araAMP in patients with advanced head and neck cancer. Subjects in the study will have RECIST 1.1 measurable HNSCC which is amenable to local injection for which there is no effective curative or palliative treatment option. This study population was selected since results from this Phase 1/2 trial are intended to support the safety of repeat dosing in further clinical investigation. 4. Study Design. The trial is designed as a single-arm study to evaluate the safety of repeat cycles of Ad/PNP and F-araAMP in patients with recurrent HNSCC with tumor(s) accessible for injection. Ad/PNP will be injected intratumorally twice on Day 1 and once on Day 2 followed by infusion of F-araAMP daily on Days 3, 4, and 5. Subjects will receive repeat administration of Ad/PNP-F-araAMP every 4 weeks (i.e., each cycle) for 5 cycles or until injected tumor progresses, unacceptable toxicity occurs, no tumor is present for injection, or patient death. Tumor response in the injected tumor(s) will be assessed by physical examination as well as by radiographic imaging. All subjects will be monitored for adverse events during study participation. ;
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