Vertex Pharmaceuticals Incorporated (Nasdaq: VRTX) today announced that the INCIVEK® (telaprevir) label in the United States has been updated to include a Boxed Warning stating that fatal and non-fatal serious skin reactions have been reported in patients taking INCIVEK combination treatment.
Fatal cases of serious skin reactions have been reported in patients with progressive rash and systemic symptoms who continued to receive INCIVEK combination treatment after a serious skin reaction was identified.
Rash and serious skin reactions are known adverse events associated with INCIVEK combination treatment and were previously included in the warnings and precautions section of the label.
Given the severity of the events reported in the post-marketing setting, and the importance of discontinuing INCIVEK combination treatment in the event of one of these reactions, the information has been given greater prominence through a boxed warning.
"The safety of people taking our medicines is our first priority, and we are committed to ensuring that patients and physicians are aware of the label update to help them use INCIVEK properly," said Robert Kauffman, MD, PhD, Senior Vice President and Chief Medical Officer at Vertex. "We will continue to educate physicians to follow the rash management plan developed while INCIVEK was in clinical trials and the information contained in the updated label."
In Phase 3 clinical trials, less than 1 percent of people who received INCIVEK combination treatment experienced a serious skin reaction. These serious skin reactions required hospitalization and all patients recovered. For serious skin reactions, INCIVEK combination treatment must be discontinued immediately, and patients should be promptly referred for urgent medical care.
The INCIVEK label was also updated to include additional information on the time to onset and management of anemia.
INCIVEK® (telaprevir) tablets is an oral medicine that acts directly on the hepatitis C virus protease, an enzyme essential for viral replication. INCIVEK has been prescribed to more than 50,000 patients in the United States. Approximately three out of four US patients who are prescribed a direct-acting antiviral for the treatment of genotype 1 chronic hepatitis C (HCV) receive INCIVEK combination therapy.
In Phase 3 clinical studies, 79 percent of people who had not previously been treated for HCV achieved a viral cure following treatment with INCIVEK combination therapy, compared with 46 percent of those who received pegylated-interferon and ribavirin (P/R) alone. Among people who were treated previously but did not achieve a viral cure, in the Phase 3 studies: 86 percent of relapsers achieved a viral cure with INCIVEK combination therapy compared to 22 percent with P/R alone; 59 percent of partial responders achieved a viral cure compared with 15 percent with P/R alone; and 32 percent of null responders achieved a viral cure compared with 5 percent with P/R alone. In addition, many people are eligible to complete treatment with INCIVEK combination therapy in 24 weeks — half the time required for treatment with P/R alone.
INCIVEK was approved by the US Food and Drug Administration (FDA) in May 2011 and by Health Canada in August 2011 for use in combination with pegylated-interferon and ribavirin for adults with genotype 1 chronic hepatitis C with compensated liver disease (some level of damage to the liver but the liver still functions), including cirrhosis (scarring of the liver). INCIVEK is approved for people who are new to treatment, and for people who were treated previously with interferon-based treatment but who did not achieve a sustained viral response, or viral cure (relapsers, partial responders and null responders).
Vertex developed telaprevir in collaboration with Janssen and Mitsubishi Tanabe Pharma. Vertex has rights to commercialize telaprevir in North America where it is being marketed under the brand name INCIVEK (in-SEE-veck). Janssen has rights to commercialize telaprevir in Europe, South America, Australia, the Middle East and certain other countries. In September 2011, telaprevir was approved in the European Union and Switzerland. Telaprevir is known as INCIVO® in Europe. Mitsubishi Tanabe Pharma has rights to commercialize telaprevir in Japan and certain Far East countries. In September 2011, telaprevir was approved in Japan and is known as Telavic®.