*Article* **Soluble CD147 (BSG) as a Prognostic Marker in Multiple Myeloma**

**Piotr Łacina 1,\* , Aleksandra Butrym <sup>2</sup> , Diana Frontkiewicz <sup>3</sup> , Grzegorz Mazur <sup>4</sup> and Katarzyna Bogunia-Kubik <sup>1</sup>**


**Abstract:** CD147 (basigin, BSG) is a membrane-bound glycoprotein involved in energy metabolism that plays a role in cancer cell survival. Its soluble form is a promising marker of some diseases, but it is otherwise poorly studied. CD147 is overexpressed in multiple myeloma (MM) and is known to affect MM progression, while its genetic variants are associated with MM survival. In the present study, we aimed to assess serum soluble CD147 (sCD147) expression as a potential marker in MM. We found that sCD147 level was higher in MM patients compared to healthy individuals. It was also higher in patients with more advanced disease (ISS III) compared to both patients with less advanced MM and healthy individuals, while its level was observed to drop after positive response to treatment. Patients with high sCD147 were characterized by worse progression-free survival. sCD147 level did not directly correlate with bone marrow CD147 mRNA expression. In conclusion, this study suggests that serum sCD147 may be a prognostic marker in MM.

**Keywords:** BSG; basigin; CD147; MM; multiple myeloma; survival
