Incivek (telaprevir) product labeling revised

The Incivek (telaprevir) product labeling was recently revised to include the following changes:

1. Update the clinical comment for neuroleptic drug pimozide in Section 4 Contraindications to state: "Potential for serious and/or life-threatening adverse reactions such as cardiac arrhythmias"

2. Update Section 5 Warnings and Precautions subsection 5.4 Anemia to state: "Hemoglobin should be monitored prior to and at least at weeks 2, 4, 8 and 12 during INCIVEK combination treatment and as clinically appropriate."

3. Update Section 5 Warnings and Precautions subsection 5.6 Laboratory Tests to state the following: Use of a sensitive real-time RT-PCR assay for monitoring HCV-RNA levels during treatment is recommended. The assay should have a lower limit of HCV-RNA quantification equal to or less than 25 IU per mL and a limit of HCV-RNA detection of approximately 10-15 IU per mL.

4. Update Section 7 Drug Interactions to remove desipramine from Table 5: Established and Other Potentially Significant Interactions. Also added to Section 7 was a statement that no dose adjustment is needed for Incivek when given with either raltegravir or buprenorphine. The corresponding results from the drug-drug interaction trial with raltegravir and buprenorphine are included in Section 12 Pharmacokinetics.

5. Update Section 14 Clinical Studies to include revisions to the definition of sustained virologic response (SVR) and to correct the SVR rates for African American and Cirrhotic subpopulations as follows:

SVR was defined as HCV RNA less than 25 IU per mL at last observation within the SVR visit window (i.e., weeks 32-78 for patients assigned to 24 weeks of treatment and weeks 56-78 for patients assigned to 48 weeks of treatment).

Trial 108 (ADVANCE)

• Twenty-six subjects were Black/African Americans. The overall SVR among Black/African American subjects was 62% (16/26). Among these subjects, 35% (9/26) were assigned to 24 weeks of treatment and of those 89% (8/9)achieved SVR.
• Twenty-one subjects had cirrhosis at baseline and the overall SVR in these subjects was 71% (15/21). Among subjects with cirrhosis, 43% (9/21)were assigned to 24 weeks of treatment and of those 78% (7/9)achieved SVR.

Trial 111 (ILLUMINATE)

• Sixty-one (11%) of subjects had cirrhosis at baseline. Among subjects with cirrhosis, 30 (49%) achieved an eRVR: 18 were randomized to T12/PR24 and 12 to T12/PR48. The SVR rates were 61% (11/18) for the T12/PR24 group and 92% (11/12) for the T12/PR48 group.
• Blacks/African Americans comprised 14% (73/540) of trial subjects. Thirty-four (47%) Black/African American subjects achieved an eRVR and were randomized to T12/PR24 or T12/PR48. The respective SVR rates were 88% (15/17) and 88% (15/17), compared to 92% (244/266) for Caucasians among randomized subjects.

Trial C216

• Twenty-six percent (139/530) of INCIVEK-treated subjects had cirrhosis at baseline. SVR rates among cirrhotic subjects who received INCIVEK combination treatment compared to Pbo/PR48 were: 84% (48/57) compared to 7% (1/15) for prior relapsers, 34% (11/32) compared to 20% (1/5) for prior partial responders, and 14% (7/50) compared to 10% (1/10) for prior null responders.
• Four percent (19/530) of treatment experienced subjects who received INCIVEK combination treatment were Black/African Americans; the SVR rate for these subjects was 63% (12/19) compared to 66% (328/498) for Caucasians.

The complete revised label¹ can be viewed on the FDA web site at Drugs@FDA².

Richard Klein
Office of Special Health Issues
Food and Drug Administration

Kimberly Struble
Division of Antiviral Drug Products
Food and Drug Administration

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