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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Oncohematology</journal-id><journal-title-group><journal-title xml:lang="en">Oncohematology</journal-title><trans-title-group xml:lang="ru"><trans-title>Онкогематология</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1818-8346</issn><issn publication-format="electronic">2413-4023</issn><publisher><publisher-name xml:lang="en">Publishing House ABV Press</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">561</article-id><article-id pub-id-type="doi">10.17650/1818-8346-2022-17-3-83-88</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>RARE AND COMPLEX CLINICAL SITUATIONS: DIAGNOSIS AND TREATMENT CHOICE</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>РЕДКИЕ И СЛОЖНЫЕ КЛИНИЧЕСКИЕ СИТУАЦИИ: ДИАГНОСТИКА И ВЫБОР ТАКТИКИ ЛЕЧЕНИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject></subject></subj-group></article-categories><title-group><article-title xml:lang="en">Neutrophilic hyperleukocytosis in the multiple myeloma onset</article-title><trans-title-group xml:lang="ru"><trans-title>Нейтрофильный гиперлейкоцитоз в дебюте множественной миеломы</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5440-4340</contrib-id><name-alternatives><name xml:lang="en"><surname>Rekhtina</surname><given-names>I. G.</given-names></name><name xml:lang="ru"><surname>Рехтина</surname><given-names>И. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>4 Novyy Zykovskiy Proezd, Moscow 125167.</p></bio><bio xml:lang="ru"><p>125167 Москва, Новый Зыковский пр-д, 4.</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kolosova</surname><given-names>L. Yu.</given-names></name><name xml:lang="ru"><surname>Колосова</surname><given-names>Л. Ю.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>4 Novyy Zykovskiy Proezd, Moscow 125167.</p></bio><bio xml:lang="ru"><p>125167 Москва, Новый Зыковский пр-д, 4.</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1008-5007</contrib-id><name-alternatives><name xml:lang="en"><surname>Khyshova</surname><given-names>V. A.</given-names></name><name xml:lang="ru"><surname>Хышова</surname><given-names>В. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Viktoriya A. Khyshova.</p><p>4 Novyy Zykovskiy Proezd, Moscow 125167.</p></bio><bio xml:lang="ru"><p>Хышова Виктория Александровна.</p><p>125167 Москва, Новый Зыковский пр-д, 4.</p></bio><email>viktoria2102@icloud.com</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1082-8659</contrib-id><name-alternatives><name xml:lang="en"><surname>Kovrigina</surname><given-names>A. M.</given-names></name><name xml:lang="ru"><surname>Ковригина</surname><given-names>А. М.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>4 Novyy Zykovskiy Proezd, Moscow 125167.</p></bio><bio xml:lang="ru"><p>125167 Москва, Новый Зыковский пр-д, 4.</p></bio><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4966-8146</contrib-id><name-alternatives><name xml:lang="en"><surname>Mendeleeva</surname><given-names>L. P.</given-names></name><name xml:lang="ru"><surname>Менделеева</surname><given-names>Л. П.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>4 Novyy Zykovskiy Proezd, Moscow 125167.</p></bio><bio xml:lang="ru"><p>125167 Москва, Новый Зыковский пр-д, 4.</p></bio><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">National Research Center for Hematology, Ministry of Health of Russia</institution></aff><aff><institution xml:lang="ru">Национальный медицинский исследовательский центр гематологии Минздрава России</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2022-07-20" publication-format="electronic"><day>20</day><month>07</month><year>2022</year></pub-date><volume>17</volume><issue>3</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>83</fpage><lpage>88</lpage><history><date date-type="received" iso-8601-date="2022-07-20"><day>20</day><month>07</month><year>2022</year></date><date date-type="accepted" iso-8601-date="2022-07-20"><day>20</day><month>07</month><year>2022</year></date></history><permissions><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/></permissions><self-uri xlink:href="https://oncohematology.abvpress.ru/ongm/article/view/561">https://oncohematology.abvpress.ru/ongm/article/view/561</self-uri><abstract xml:lang="en"><p>Neutrophilic leukocytosis is not specific for multiple myeloma (MM) and is a reason for the exclusion of myeloproliferative neoplasm.</p><p>A clinical case of MM patient with neutrophilic hyperleukocytosis (75 х 10<sup>9</sup>/L), liver and spleen enlargement at the disease onset is presented. Examination did not reveal t(9;22), <italic>BCR/ABL</italic> gene and <italic>JAK2V617F </italic>mutation. To exclude the combination of MM with chronic neutrophilic leukemia, a study of the clinically significant part of the <italic>CSFR3R</italic> gene was performed. The absence of a <italic>CSFR3R</italic> gene mutation made it possible to exclude chronic neutrophilic leukemia and start MM treatment. After the 1<sup>st</sup> therapy course with bortezomib, cyclophosphamide and dexamethasone, blood counts returned to normal, liver and spleen size decreased. After 6 therapy courses, complete hematological remission was achieved. An attempt to mobilize peripheral blood stem cells with cyclophosphamide was unsuccessful. The effectiveness of antimyeloma therapy proved the correctness of the diagnosis and the chosen treatment tactics.</p><p>Neutrophilic leukocytosis in MM is explained by the ability of plasma cells to synthesize granulocyte colony-stimulating factor in some cases. In the presence of a plasma cell tumor, the analysis of the <italic>CSFR3R</italic> gene may be of decisive importance in the differential diagnosis of reactive neutrophilic leukocytosis due to MM and the combination of MM with chronic neutrophilic leukemia.</p></abstract><trans-abstract xml:lang="ru"><p>Нейтрофильный лейкоцитоз нехарактерен для множественной миеломы (ММ) и служит основанием для исключения конкурентного миелопролиферативного новообразования.</p><p>Представлено клиническое наблюдение пациента с ММ, у которого в дебюте заболевания отмечались нейтрофильный гиперлейкоцитоз (75 х 10<sup>9</sup>/л), гепато- и спленомегалия. При обследовании не обнаружено t(9;22), гена <italic>BCR/ABL</italic> и мутации <italic>JAK2V617F</italic>. для исключения сочетания ММ с хроническим нейтрофильным лейкозом было выполнено исследование клинически значимой части гена <italic>CSFR3R</italic>. Отсутствие мутации гена <italic>CSFR3R </italic>позволило исключить хронический нейтрофильный лейкоз и с уверенностью начать лечение ММ. после 1-го курса терапии по программе «бортезомиб, циклофосфамид и дексаметазон» нормализовались показатели крови, уменьшились размеры печени и селезенки. после 6 курсов терапии была достигнута полная гематологическая ремиссия. попытка мобилизации периферических стволовых клеток крови с введением циклофосфамида оказалась неудачной. эффективность противомиеломной терапии доказала правильность диагноза и выбранной тактики лечения.</p><p>Нейтрофильный лейкоцитоз при ММ объясняется способностью плазматических клеток в ряде случаев синтезировать гранулоцитарный колониестимулирующий фактор. при наличии плазмоклеточной опухоли исследование гена <italic>CSFR3R</italic> может иметь решающее значение в дифференциальном диагнозе реактивного нейтрофильного лейкоцитоза вследствие ММ и сочетания ММ с хроническим нейтрофильным лейкозом.</p></trans-abstract><kwd-group xml:lang="en"><kwd>multiple myeloma</kwd><kwd>hyperleukocytosis</kwd><kwd>chronic neutrophilic leukemia</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>множественная миелома</kwd><kwd>гиперлейкоцитоз</kwd><kwd>хронический нейтрофильный лейкоз</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Rybina O.V., Shavel Yu.A., Petrenko A.A. et al. 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