Journal of Clinical Toxicology
Open Access
ISSN: 2161-0495
+44 1478 350008
ISSN: 2161-0495
+44 1478 350008
Hemant Misra
Prolong Pharmaceuticals, USA
Keynote: J Clin Toxicol
ANF-Rho is a novel polyethylene glycol-modified granulocyte colony stimulating factor that has biophysical and biological properties that produce a distinct pharmacokinetic and pharmacodynamic profile as compared to pegfilgrastim (Neulasta�®). ANF-Rho was evaluated in a series of studies to assess the pharmacokinetics, pharmacodynamics and toxicity in the rat and primate as compared to Neulasta�®. Rats were made neutropenic by injection of cyclophosphamide to determine pharmacokinetic and pharmacodynamics effects of ANF-Rho. Both single and repeat dose toxicity studies administered for up to 5 once weekly doses. Endpoints for toxicological studies included clinical observations, body weights, food consumption, ophthalmic exams, neurotoxicity, clinical pathology, immunogenicity, necropsy and histopathology. Pharmacokinetics were determined following subcutaneous (SC) or intravenous (IV) administration of either 50, 75 or 100 �¼g/kg in Sprague Dawley rats and 10 or 100 �¼g/kg in cynomolgous primates. Neulasta was dosed at 100 �¼g/kg. Analysis of variance (ANOVA) with a Dunnetâ��s post-hoc test was performed to demonstrate significant differences (p<0.05) between treatment groups. The halflife of ANF-Rho SC in the rat ranged from 17.99 to 18.05 hours for the 3 doses as compared to 5.63 for the Neulasta group. Pharmacodynamic analysis of the area under the curve (AUC) kinetic analysis showed the absolute neutrophil count (ANC) of ANF-Rho was equivalent at 4X lower dosage (25 vs. 100 ug/kg) and yielded significantly higher ANC than Neulasta when administered at equivalent 100 �¼g/kg dosage. ANF-Rho yielded a 4-6 fold increased in de novo neutrophil (CD34+) counts. No observed toxicologically or significant findings for any endpoint in rats receiving a single dose of 100, 1000, 3000, 10000 or 25000 �¼g/kg of ANF-Rho in the rat for maximum tolerated dose (MTD) study. No clearly adverse effects were seen following treatment with ANF-Rho in rats over a 28 days treatment period with a calculated NOAEL of 1000 �¼g/kg. Primates were dosed with 250 or 750 �¼g/kg. The NOAEL was to be determined to be greater than 750 �¼g/kg. Rat neutropenia dosage model results found that the blood pharmacodynamics parameters of ANF-Rho were significantly superior to Neulasta. Both PK and PD data demonstrate relatively predictable systemic exposures and activity following SC or IV dose levels in both rat and primate. The toxicology studies were unremarkable and sufficient to support advancement of ANF-Rho into Phase I clinical studies.
Hemant Misra received his PhD from Lucknow University in Medicinal and Pharmaceutical Chemistry and has published over 65 articles and a patent. He is VP Clinical Development for Prolong Pharmaceuticals. He has over 30 years of biopharmaceutical development, global clinical study management and corporate development experience. He has managed drug development, CGMP manufacturing, CTM, quality systems and multiple global clinical trials.
Email: HMisra@prolongpharma.com