Tehran University of Medical Sciences Case Reports in Clinical Practice 2538-2683 6 S1 2022 07 06 274 278 Marziyeh Ghalamkari Department of Hematology and Medical Oncology, Iran University of Medical Science, Tehran, Iran. farhad shahi Department of Hematology and Medical Oncology, Breast Disease Research Center, Tehran University of Medical Science, Tehran, Iran. Samaneh Salarvand Department of Hematology and Medical Oncology, Breast Disease Research Center, Tehran University of Medical Science, Tehran, Iran. Aahmad khajeh-mehrizi Department of Hematology and Medical Oncology, Imam Khomeini Hospital Complex, Tehran University of Medial Science, Tehran, Iran. 2021 01 21 2021 02 01 Multiple myeloma (MM) has been suggested to associate with other solid tumors. Myeloma or its chemotherapy regimens may be a risk factor for developing primary and secondary malignancies. But the coexistence with other tumors is rare. We report an old patient simultaneously suffering from MM and gastric adenocarcinoma. https://crcp.tums.ac.ir/index.php/crcp/article/view/463