A rare entity in multiple myeloma: six nerve paralysis.

Ophthalmic involvement appears rarely in multiple myeloma (MM). Ophthalmic findings are mostly noted as complications caused by disease or treatment. MM-associated with 6th nerve paralysis is a rare entity. Bortezomib, one of the novel agents used to treat MM, has neurotoxic effect and may cause permanent nerve damage. Herein, we report a 50-year-old male patient with MM who developed the 6th nerve paralysis while receiving bortezomib and discuss its relevant causes.

Evaluation of clinical and laboratory findings with JAK2 V617F mutation as an independent variable in essential thrombocytosis.

Essential thrombocythemia (ET) is an entity of classic Philadelphia chromosome-negative myeloproliferative neoplasms (MPNs), characterized by thrombocytosis with megakaryocytic hyperplasia and thrombocytes are increased with abnormal functions. Discovery of the protein tyrosine kinase JAK2 V617F allele contributed to better understanding of the pathogenetic mechanisms of MPNs. Acquired single point mutation in the JAK2 V617F was determined approximately 50-60 % of patients with ET. In this study we aimed to investigate the relationship between JAK2 V617F gene mutation, hematologic, biochemical markers and the complications in the ET patients. A total of 268 patients diagnosed with ET and 219 of those studied for JAK2 gene mutation were followed at the hematology clinics of three major hospitals between 2008 and 2013 were screened retrospectively. Laboratory, clinical and hematologic parameters were compared for JAK2 V617F positive and JAK2 V617F negative patients with ET. 102 (46 %) patients were positive with the JAK2 V617F mutation. The complications were observed in 61 (28 %) patients and 38 (62 %) of them had JAK2 V617F mutation. The levels of white blood cells, neutrophil, basophil, red blood cells, hemoglobin, hematocrit, mean platelet volume, thrombocytes, eosinophil; urea, creatinine were significantly different in patients with the JAK2 V617F mutation (P < 0.05). Presence of the JAK2 V617F mutation supports the diagnosis of ET. It would be useful to investigate the JAK2 V617F mutation and the hematologic and biochemical markers at diagnosis with respect to consider the risk of developing complications and to take the precautions against these complications.

Successful management of cryoglobulinemia-induced leukocytoclastic vasculitis with thalidomide in a patient with multiple myeloma.

Leukocytoclastic vasculitis (LV) is a systemic inflammatory disorder involving mostly the small vessels. It is characterised by segmental angiocentric neutrophilic inflammation, endothelial cell damage and fibrinoid necrosis. LV is related to a variety of clinical disorders including cryoglobulinemia and, very rarely, multiple myeloma (MM), among many others. The development of LV in patients with MM has been linked to cryoglobulinemia, infections, drugs and paraneoplasia. It has been speculated that myeloma patients with a poorer prognosis and progressive disease are more prone to develop LV. Thalidomide is a rediscovered old drug with anti-angiogenic, immunomodulatory and anti-inflammatory properties. It is highly effective in the treatment of MM and other clinical disorders such as leprosy, various cancers, graft-versus-host disease and autoimmune diseases. We report here a female patient with Durie-Salmon stage IIA MM who initially presented with cryoglobulinemia and LV. LV in this patient was primarily considered to be the result of progressive cryoglobulinemia, which was closely associated with MM. She was successfully managed with thalidomide and dexamethasone.