[The role and possibilities of natural interferon treatment in chronic hepatitis C: experience with natural interferon treatment for patients barred from combined antiviral therapy because of the STOP rule].
The first choice, and the most efficient therapy for chronic hepatitis C is the pegylated interferon + ribavirin treatment. The introduction and application of the STOP rule (pegylated interferon + ribavirin treatment should be stopped in cases without sufficient virological answer for the therapy at the 12th or 24th week of the treatment) is motivated by the very high cost of this treatment.


OBJECTIVE
The greatest problem of the application of the STOP rule is that these patients are not coming in for the proven advantages of one-year interferon treatment (arrest or decrease the inflammation, decrease or prevent the progression to liver cirrhosis, decrease probability or prevent the development of hepatocellular carcinoma), which were observed almost in virologically slow-, partial-, or non-responder patients who received one-year interferon therapy. Based on these data, the official Hungarian treatment protocol allows and recommends the continuation of the antiviral treatment by natural interferon for patients whose pegylated interferon + ribavirin treatment should have been stopped because of the STOP rule.


METHODS
15 patients whose pegylated interferon + ribavirin treatment should have been stopped because of the STOP rule (8 men, 7 women, age: 35-63, mean: 48.8 years, HCV genotype: 1b, HAI mean: 6.7, SD: +/-5.03; stage: mean: 1.75 SD: +/-0.9) treatment was continued with natural IFN for further 16-36 (mean 23.7) weeks. The total treatment duration was 48-52 weeks. The duration of follow-up was at least 6 months.


METHODS
18 patients whose pegylated interferon + ribavirin treatment should have been stopped because of the STOP rule (7 men, 11 women, age: 32-63, mean: 48.7 years, HCV genotype: 1b, HAI mean: 10.1, SD: +/-4.8; stage mean: 2.0 SD: +/-0.6). The duration of follow-up was at least 6 months.


RESULTS
There is no significant difference between the two groups. The ALT level significantly decreased (73.4 U/l SD: +/-25.5 versus 45.9 U/l SD: +/- 22.1) due to pegylated interferon + ribavirin treatment, and remained at this level during the natural interferon treatment and the follow up (45.7 U/l SD: +/-15.1, and 49.3 U/l SD: +/-19.4 U/l; p < 0.001). The difference is significant. The ALT level decreased (108.5 U/l SD: +/-69.8 versus 86.0 U/l SD: +/-82.8) due to pegylated interferon + ribavirin treatment, but increased after the cessation of the therapy (99.7 U/l SD: +/-60.9) in the control group. The biochemical response (significant reduction of ALT level) which was detected during the pegylated interferon + ribavirin treatment remained permanent during the continuation and after the cessation of the therapy in the natural interferon treated group, while relapse occurred in every case in the control group. The viral load increased at least 1 log 10 after cessation of the therapy in pegylated interferon + ribavirin treatment non-responder patients. The natural interferon treatment was able to control the viral replication (prevent the increasing of the viral load), but after the termination of natural interferon dosage, similar elevation of viral load was observed. The subjective side effects of natural interferon treatment were rarely and milder. Leucopenia and thrombopenia occurs rarely and was milder than that during the pegylated interferon + ribavirin therapy.


CONCLUSIONS
The patients have no difficulty in the application of natural interferon; probably the positive psychic effect of the fact that they have not been barred from treatment compensated the technical hardness (three injections weekly). A wide range of the application of this therapeutic possibility, and further studies with larger number of patients are suggested.
IRM Központi Kórház és Intézményei I. Belgyógyászati Osztály Budapest. gbhorvath@t-online.hu
Gábor
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Horváth
Gyula
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Tolvaj
Tünde
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Halász
Gyula
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Stotz
D000328:Adult; D000998:Antiviral Agents / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D004359:Drug Therapy, Combination; D005260:Female; D005500:Follow-Up Studies; D019698:Hepatitis C, Chronic / Q000188:drug therapy*; D006801:Humans; D006814:Hungary; D000077190:Interferon alpha-2; D016898:Interferon-alpha / Q000627:therapeutic use; D007372:Interferons / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D007970:Leukopenia / Q000139:chemically induced; D008297:Male; D008875:Middle Aged; D011092:Polyethylene Glycols / Q000627:therapeutic use; D017410:Practice Guidelines as Topic; D011994:Recombinant Proteins; D012254:Ribavirin / Q000627:therapeutic use; D013921:Thrombocytopenia / Q000139:chemically induced; D016896:Treatment Outcome; D019562:Viral Load
D000998:Antiviral Agents; D000077190:Interferon alpha-2; D016898:Interferon-alpha; D011994:Recombinant Proteins; D011092:Polyethylene Glycols; D012254:Ribavirin; D007372:Interferons; C100416:peginterferon alfa-2a