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However, meta-regression analysis demonstrated a significant heterogeneity due to ethnicity. However, it is possible that the variation is even larger between different Asian populations. Influence analysis was also carried to assess whether summary OR was driven by any one study in the recessive model of meta-analysis Sterne et al2002. Yasuda et al 2007 have reported that of the 11 known human cytosolic sulphotransferases, SULT1A1 is one of the four major SULT enzymes responsible for sulphation of tobacco carcinogens. Tobacco is implicated as the single most important environmental factor for several TRCs lung, head and les mer, oesophagus, bladder, kidney and pancreas. Considering that His 213 variant of SULT1A1 has a lower activity than Arg 213 variant Raftogianis cm dd tpe dukke knullet al1997 ; Nagar et al2006we hypothesise that if tobacco carcinogenesis is significantly modulated by the Arg 213 His polymorphism, it would demonstrate a significant association with TRC and this gå til side may be stronger in individuals with multiple primary TRC. The focus of research to elucidate genetic susceptibility to tobacco carcinogenesis has been on phase I and phase II detoxifying enzymes and to a lesser extent on the genes that regulate DNA repair, apoptosis and other relevant pathways.

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Stratified meta-analysis according to cancer site, irrespective of ethnicity or any other factor, showed a 1. However, it is possible that the variation is even larger between different Asian populations. To elucidate the effect of Arg 213 His polymorphism of SULT1A1 in tobacco users, we have studied a group of patients with multiple primary cancers, where at least one of the primary cancers was a TRC. In addition, meta-analysis in general looks at the crude OR instead of adjusted OR as the adjustment and matching factors differ across the studies. The results of this meta-analysis are intriguing as they demonstrate opposite effects of SULT1A1 polymorphism on two distinct anatomical sites of TRCs. Discussion Despite decades of public health programmes, TRCs remain the leading cause of cancer morbidity and mortality worldwide. Majority of the MPN cases in the registry hailed from the western and northern parts of India.

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Open in a separate window. To elucidate the effect of Arg 213 His polymorphism of SULT1A1 in tobacco users, we have studied a group of patients with multiple primary cancers, where at least one of the primary cancers was a TRC. Carlsten et al 2008 have reported that although GSTM1 null status conferred a significantly increased risk of lung cancer to East Asians it did not confer increased risk to Caucasians. Acknowledgments The work was supported in part by a grant from Department of Biotechnology no. It has been reported that the carcinogens are transferred to the kidney and ureter Meinl et al2006 although their levels are substantially lower in the kidney than in the liver.

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