Sigma Pharmaceuticals Limited (SIP) requested its shares be suspended from trading as the company expects to make an announcement to the market in relation to revised earnings guidance for the year ended 31 January 2010. The company said it expects that the suspension remain in place until it makes an announcement concerning revised guidance for the year or requests that the suspension be lifted. Sigma expects to make an announcement to the market concerning the revised guidance before the expected date for the release of its preliminary final results.