https://www.selleckchem.com/products/fadraciclib.html 05). The survival rate of patients with MM exhibiting elevated PT, FIB, and D-D levels was significantly lower (P<0.05). Univariate and multivariate analysis showed that each coagulation index was the influencing factor on the follow-up outcomes of MM patients, in which FIB was an independent prognostic factor. Coagulation function is correlated with multiple clinical indicators of patients with MM and plays an important role in their prognosis. Coagulation function is correlated with multiple clinical indicators of patients with MM and plays an important role in their prognosis. To analyze one case of multiple myeloma (MM) initially presenting cold agglutinin syndrome (CAS), so as to improve clinical understanding and screening of this disease. The clinical data, laboratory examination, bone marrow result, diagnosis and treatment of the patient were analyzed and summarized to provide ideas and clinical experience for the early diagnosis and treatment of CAS secondary to MM. The clinical manifestations of asthenia, hemolysis, jaundice and scattered livedo reticularis were caused by CAS secondary to MM, which was different from the general Raynaud's phenomenon. IgMκ type MM was definitely diagnosed according to the morphological features of bone marrow cells and immunofixation electrophoresis. After 3 courses of chemotherapy with BAD regimen and enhanced thermal support, anemia was corrected, M protein was decreased and the cold agglutinin phenomenon was significantly reduced. The evaluation of efficacy reached very good partial response. There are very few MM patients with CAS as the initial presentation, so it is easy to misdiagnose. Early diagnosis and individual therapy are particularly important, which requires clinicians to observe and gain experience further. There are very few MM patients with CAS as the initial presentation, so it is easy to misdiagnose. Early diagnosis and individual therapy are particul