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Generic hepatitis C drugs continue to produce high cure rates
Keith Alcorn, 2017-04-24 17:30:00
Treatment with generic versions of direct-acting antiviral drugs continues to produce similar cure rates to those reported in clinical trials, Dr James Freeman reported last week at the International Liver Congress in Amsterdam.
Dr James Freeman, an Australian general practitioner based in Hobart, Tasmania, was reporting on the outcomes of people with hepatitis C who imported generic versions of direct-acting antivirals manufactured in India and elsewhere because they couldn’t afford treatment in their own country, or were denied treatment on grounds of cost.
Importation of medicines for personal use is permitted under customs regulations in Australia and the United Kingdom, and many other countries have regulations permitting the importation of small amounts of medicines for personal use or their carriage through customs in personal luggage. The FixHepC buyer’s club provided advice and information on how to do this safely and legally, starting in Australia, but soon responding to enquiries from people in Europe, North America, New Zealand and South East Asia.
At last year’s International Liver Congress Dr James Freeman, an Australian general practitioner based in Hobart, Tasmania, reported SVR4 data for 139 patients who had imported generic direct-acting antivirals to their own countries and who provided laboratory-confirmed details of HCV RNA monitoring and other medical information during and after their treatment.
At this year’s congress, Dr James Freeman reported sustained virologic response data for 448 patients, including the 139 patients included in last year’s preliminary report.
People included in the study cohort lived mainly in Australia, New Zealand, the United States and the European Union, although the cohort also included a large cluster of patients in Nigeria.
Participants were treated predominantly with sofosbuvir and ledipasvir (50.5%) or sofosbuvir and daclatasvir (48.6%) using products manufactured in India or Bangladesh. A small proportion added ribavirin to their combination, and 0.9% took sofosbuvir and ribavirin.
The cohort included a high proportion of treatment-experienced people (42.4%) and 28% had cirrhosis. Fifty-seven per cent were male, with a mean age of 55 years. Participants had a high mean baseline HCV RNA (6.47 log IU/ml). Genotype 1 infection predominated (67%) but a sizeable proportion (22.5%) had genotype 1 infection and a smaller proportion genotype 2 infection (6.25%).
Although HCV RNA measurements were carried out by different laboratories, using a lower limit of quantification of <25 IU/ml as the measure of virologic response, 85.7% of participants achieved rapid virologic response and 99.3% an end-of-treatment virologic response. The sustained virologic response rate four weeks post-treatment (SVR4) was 94% and the SVR12 rate was 90%. Only two patients out of 448 were lost to follow up.
Post-treatment virologic relapse was most evident in genotype 3 patients; only 82% of genotype 3 patients (83 of 101) achieved SVR12, compared to 91% of genotype 1 (275 of 301) patients, 100% of genotype 2 (28/28), 91% of genotype 4 (10/11) and 100% of genotypes 5 and 6 patients (7/7).
Dr Freeman blamed under-treatment for many cases of relapse, for genotype 3 patients especially. Viral load appeared to decline more quickly in genotype 1 patients treated with sofosbuvir and daclatasvir compared to genotype 3, leading Dr Freeman to suggest that even in previously untreated genotype 3 patients without cirrhosis, 16 weeks of sofosbuvir and daclatasvir may be necessary to achieve a cure.
The risk of relapse or treatment failure was clearly predicted by virological response after day 24. If a patient still had a detectable HCV RNA beyond this point (above the lower limit of detection, or >LLOD), they were twice as likely to fail to achieve SVR12 (odds ratio 1.91, 95% CI 1.11-3.30, p=0.02). Dr Freeman suggested that intensifying treatment at this time, for those patients with a detectable HCV viral load, would be more cost-effective than assembling a salvage regimen.
Baseline cirrhosis was similarly predictive of a failure to achieve SVR12 (OR 1.92, 95% CI 1.16-3.21). Dr Freeman observed that ten patients with cirrhosis were prescribed 12-week courses of treatment, only two of these with ribavirin.
Dr Freeman also provided a snapshot of results from three other cohorts of patients in Eastern Europe, South East Asia, Europe and North America who are obtaining generic direct-acting antivirals. So far, an additional 229 patients have reached the 12-week post-treatment follow-up point; of these, 222 have achieved a sustained virological response, representing a cure rate of 97%.
Dr Freeman reminded delegates that the majority of people treated for hepatitis C worldwide received generic versions of direct-acting antivirals, and that the use of generics will accelerate as more countries begin to provide hepatitis C treatment. Egypt alone has treated more one million people.
But for at least 51% of the world’s population with hepatitis C, an affordable cure for hepatitis C remains out of reach, he said, due to patent barriers.
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