UPDATE 2-TCS founder Tinkov discloses leukaemia fight amid US tax charges; shares slide <!-- no image --> <div>* TCS Group's shares down more than 20% in London (Adds Tinkov comment, updates share price)<div class="feedflare"> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=WZshNkUMqgg:QnPwLaTm06c:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?d=yIl2AUoC8zA" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=WZshNkUMqgg:QnPwLaTm06c:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=WZshNkUMqgg:QnPwLaTm06c:V_sGLiPBpWU" border="0"></a> <a href="http://feeds.reuters.com/~ff/reuters/UKBankingFinancial?a=WZshNkUMqgg:QnPwLaTm06c:F7zBnMyn0Lo"><img src="http://feeds.feedburner.com/~ff/reuters/UKBankingFinancial?i=WZshNkUMqgg:QnPwLaTm06c:F7zBnMyn0Lo" border="0"></a> </div><img src="http://feeds.feedburner.com/~r/reuters/UKBankingFinancial/~4/WZshNkUMqgg" height="1" width="1" alt=""></div> Posted by Reuters