2. Must be diagnosed with MM and meet one of the following criteria: 1) have been treated for MM with steroids only, or have received no more than two cycles of induction chemotherapy for MM and are going to be treated with bortezomib or thalidomide for induction therapy; 2) have received induction therapy and have been approved (or are being approved) medically and financially to receive autologous hematopoietic stem cell transplantation (Auto-HSCT); 3) cross sectional study patients will be either with a current diagnosis of asymptomatic MM not receiving treatment; or at least 12 months from the MM diagnosis, had received induction therapy, with or without received autologous hematopoietic stem cell transplantation (Auto-HSCT) and follow-up treatments. This cohort for a cross sectional survey may include the cases been enrolled, either completed or dropped from the same study. It may also include patients who did not participate on the first phase of the protocol (longitudinal cohort).