DAA Guidance Terminology Change Suggested
AbbVie says that an FDA draft guidance on developing direct-acting antiviral (DAA) drugs for treating hepatitis C routinely uses the term “resistance associated substitutions” for the specific viral genome position changes that confer resistance. The company’s comment letter says that the term “resistance associated variants” is commonly used rather than “resistance associated substitutions.” If the agency decides to retain its term, the letter says, it should be added to the guidance’s glossary of acronyms. The company also provides line-by-line specific comments and recommendations.
Merck’s comment letter says it commends FDA for issuing a revised version of the draft and also includes specific line-by-line comments.
The Hepatitis Foundation International also praises FDA for the draft guidance, saying that its recommendations are important for industry to consider when developing DAA drugs to treat hepatitis C. “The idea of having several phase developments that assess different aspects of the drug is extremely important,” the foundation says. “The human safety data collected in Phase 1 is key because it determines if the drug is safe for use in humans and whether the production of the drug should continue. As a patient advocacy group, we fully support treatments that have limited side effects which could impede patients’ quality of life.”
The comment letter also recommends assessment of populations in addition to those listed in the draft during drug development. And it says that factors of age and race should also be considered during the Phase 3 efficacy trial.