Abstract
Background
The association of lichen planus with hepatitis C (HCV) has been widely reported in the literature. However, there are wide geographical variations in the reported prevalence of HCV infection in patients with lichen planus. This study was conducted to determine the frequency of hepatitis C in Iranian patients with lichen planus at Razi hospital, Tehran.
Methods
During the years 1997 and 1998, 146 cases of lichen planus, 78 (53.1%) women and 69 (46.9%) men were diagnosed. They were diagnosed on the basis of the usual clinical features and, if necessary, typical histological findings. The patients were screened for the presence of anti-HCV antibodies by third generation ELISA and liver function tests. We used the results from screening of blood donors for anti HCV (carried out by Iranian Blood Transfusion Organization) for comparison as the control group.
Results
Anti-HCV antibodies were detected in seven cases (4.8%). This was significantly higher than that of the blood donors' antibodies (p < 0.001). The odds ratio was 50.37(21.45–112.24). A statistically significant association was demonstrated between erosive lichen planus and HCV infection. Liver function tests were not significantly different between HCV infected and non-infected patients.
Conclusion
HCV apears to have an etiologic role for lichen planus in Iranian patients. On the other hand, liver function tests are not good screening means for HCV infection.
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Background
Lichen planus (LP) is an idiopathic inflammatory disease with characteristic clinical and pathologic features affecting the skin, mucous membranes, nails, and hair. It is likely that both endogenous-genetic and exogenous-environmental components such as some drugs or some infection(s) may interact to elicit the disease [1]. An increased prevalence of chronic liver diseases has been reported in patients with LP, including primary biliary cirrhosis and chronic active hepatitis or cirrhosis of unknown origin [2–5]. Recently, a more widespread and chronic viral disease, hepatitis C (HCV), has been implicated in triggering LP. While some studies of selected populations with LP have confirmed a significant association with HCV [3, 6–9], other investigations have failed to document this finding [10–14]. This study was conducted to determine the frequency of hepatitis C in patients with LP at Razi hospital, in Tehran, Iran.
Methods
In this case-control study 146 cases of LP were selected using simple non-random (sequential) sampling. The study was conducted during 1997 and 1998. Diagnosis of LP was made by clinical observation and in suspicious cases, diagnosis was confirmed by biopsy. Patients suspected of drug-induced lichenoid eruptions, were not included.
The demographic data such as age, gender, duration of illness and other pieces of information including type of lesions, sites of involvement and patients' symptoms were collected using a checklist after the patients' consent.
Hepatitis C antibody titer was measured by third generation Enzyme-Linked Immunosorbent Assay (Ortho® HCV 3.0 ELISA Test System; Ortho-Clinical Diagnostics, Raritan, NJ, USA). We used the prevalence of HCV antibody among 319375 volunteer blood donors (1996–1998) for comparison as the control group [15]. Liver function tests were also performed (Shimanzym-Iran).
Serum aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels ranging between 5 to 40 IU/lit, alkaline phosphatase levels 70 to 306 IU/lit and bilirubin concentrations below 1.4 mg/dl were assumed as normal.
The collected data were analyzed using SPSS (ver.10) software. Mean age, duration of illness and laboratory tests were compared between LP patients with and without hepatitis C by using T-test. HCV antibody frequency was compared in different groups using the chi-square test.
Results
Seven patients (4.8%) out of 146 had positive titer for anti-HCV antibody. When compared to the control group the odds ratio was 50.37(21.45–112.24). The clinical and laboratory characteristics of these patients are detailed in table 1.
The mean age of the patients in this study was 40.8 ± 15.7 years (patients were from ages 8–76). Sixty nine patients (46.9%) were male and 78(53.1%) were female. Sites of LP involvement were: skin in 137 patients (93.2%), mucous membrane in 61 patients (41.5%), and nails in 28 patients (19.2%). Pruritus was seen in 124 patients (90.5%).
The observed lesion types were as follows: nonerosive mucosal in 57 patients (39%), hypertrophic in 45 patients (30.6%), annular in 39 patients (26.5%), folicullar in 37 patients (25.2%), nonerosive palmoplantar in 29 patients(19.9%), nail lesions in 28 patients (19.2%), atrophic in 14 patients (9.5%), erosive mucosal lesions in 11 patients (7.5%), guttate form in 14 patients (9.5%), actinic in 7 patients (4.8%) and erosive palmoplantar lesions in 1 patient (0.7%).
In 11 patients (7.5%) serum aspartate aminotransferase (AST) levels were higher than normal and high levels of alanine aminotransferase (ALT) were detected in 21 patients (14.3%). Higher levels of alkaline phosphatase were observed in 7 (4.8%) patients. Five patients (3.4%) had bilirubin concentrations higher than the normal range.
Eight patients mentioned a history of blood transfusion, 4 in LP patients with HCV and 4 in those without HCV. The history of transfusion was significantly higher in hepatitis C group (P < 0.001).
Discussion
In recent years, both mucosal and cutaneous lichen planus have been reported to occur in the setting of chronic HCV infection [14]. However, there are wide geographical variations in the reported prevalence of HCV infection in patients with LP, varying from 0% in England [16] to 63% in Japan [17]. The available reports indicate that the prevalence of HCV antibodies in patients with mucosal and cutaneous LP is significantly higher than that of the control populations (non-LP dermatologic patients or population of blood donors) in Germany[8], Italy[18], Spain[3, 9], the USA and Japan,[14]suggesting an etiologic role for HCV in LP. However studies in France [11, 12] and England [11, 13, 16] could not demonstrate a statistically significant association between HCV and LP. Erkek et al [14] found that HCV antibody prevalence in Turkish patients with LP (12.9%) was higher than that of the control group (3.7%) but the difference was not statistically significant, whereas Kirtek et al [7] found statistically significant difference in Gaziantep region of Turkey.
According to our study HCV antibody prevalence in Iranian patients with LP was 4.8%. It was significantly higher than anti-HCV antibody prevalence in blood donors (0.1%), used as control group (P < 0.001). To our knowledge, there is no previous study evaluating the prevalence of anti-HCV in Iranian LP patients.
In our cases GOT was higher than the normal range in 11(7.5%) patients, none of them were HCV infected. A high level of alkaline phosphatase was measured in 14 (9.5%) patients. The bilirubin concentration was abnormal in 7% of cases. There was no significant difference in liver function tests between HCV infected and non infected groups.
As expected, there were significantly more cases with positive transfusion history among hepatitis C affected group (P < 0.001).
Type of LP and lesional location did not differ between the two groups. As with other studies [3, 9, 18], mucosal erosions were more common in hepatitis C patients (p < 0.001).
The pathogenic role of HCV in the development of LP is still unclear. For some authors the association of LP and positive serology for HCV, even positive RNA is not a substantive enough reason to determine the role of HCV in the pathogenesis of LP. Nevertheless, demonstration of HCV RNA in epithelial cells of oral mucosa [19, 20] and skin lesions [14] of patients with LP would lead to the theory that direct action of the virus is involved. HCV could be a potential antigen presented by Langerhans cells, followed by activation and migration of lymphocytes resulting in damage to basal cells via cytockines of cytotoxic T cells [21, 18]. The virus may alter epithelial antigenicity at sites of mucocutaneous replication leading either to direct activation of cytotoxic T cells [13, 21] or to production of antibodies against epithelial antigens [23]. Recently, Petruzzi et al [24] demonstrated differences in lymphocyte subpopulations between HCV positive oral LP patients and HCV negative patients with oral LP. They attributed this to the chronic antigenic stimulation of HCV. On the other hand, the different results in previous studies and the differences in respect to the geographic area could be in relation to the different genetic susceptibility of the hosts. Carrozzo et al [25] have suggested that genetic polymorphism of interferon-gamma and tumor necrosis factor-alpha may contribute to the development of oral and orocutaneous involvement, respectively.
Conclusions
It seems that screening for anti-HCV antibody is valuable in LP patients, even in those with normal liver function tests.
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Ghodsi, S.Z., Daneshpazhooh, M., Shahi, M. et al. Lichen planus and Hepatitis C: a case-control study. BMC Dermatol 4, 6 (2004). https://doi.org/10.1186/1471-5945-4-6
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DOI: https://doi.org/10.1186/1471-5945-4-6