ИЗУЧЕНИЕ ДИНАМИКИ ОПУХОЛЕВОГО КРОВОТОКА ДЛЯ ОЦЕНКИ РАННЕГО ОТВЕТА РАКА МОЛОЧНОЙ ЖЕЛЕЗЫ НА НЕОАДЪЮВАНТНУЮ ХИМИОТЕРАПИЮ

Background. Over the past 20 years, there has been a change in approaches to the treatment of breast cancer, in particular, a significant increase in the role of drug therapy. Breast cancer response to neoadjuvant chemotherapy is currently considered as a surrogate biomarker, which allows evaluation of the clinical course and prognosis of the disease. To solve this problem, it is necessary to assess the functional and metabolic changes in tumor tissue during treatment. Doppler ultrasound is a non-invasive, affordable, and low-cost imaging technique that can be safely used for repeated measurements.The purpose of the study was to study vascular changes in the tumor by power Doppler ultrasound for the evaluation of the early breast cancer response to neoadjuvant chemotherapy.Material and Methods. From May 2017 to August 2019, 63 patients with breast cancer received neoadjuvant chemotherapy. Changes in the tumor blood flow were assessed before starting the treatment and prior to the second course of neoadjuvant chemotherapy using Doppler scanning. Changes in tumor blood floor after chemotherapy were compared with the pathological tumor response after surgical treatment.Results. In the vast majority of cases (78 %), there was a decrease in the number of tumor vessels after the first cycle of neoadjuvant chemotherapy independent of the grade of pathological response. In 8 cases with increased vascularization after the first cycle of neoadjuvant chemotherapy, histological examination of the removed tumor showed no response / weak response to treatment in the absence of peritumoral inflammation. In 5 cases, a sharp increase in the number of vessels around large areas of intranodular necrosis and peritumoral inflammation was observed. In general, a comparison of changes in tumor vascularization and pathological response revealed a weak, although statistically significant, negative correlation between changes in the tumor blood flow after neoadjuvant chemotherapy and pathological response.Conclusion. It was not possible to establish an unambiguous relationship between the reaction of the vascular bed and the tumor response to the cytostatic effect. An increase in the number of tumor vessels in the absence of peritumoral inflammation was the only situation when changes in tumor blood flow during chemotherapy can be unambiguously interpreted as a predictive criterion for the absence / weak response of the tumor to treatment.Введение. В течение последних 20 лет произошло изменение подходов к лечению рака молочной железы, в частности существенное повышение роли лекарственной терапии. Ответ на неоадъювантную химиотерапию рассматривается в настоящее время как суррогатный биомаркер, который позволяет оценить течение и прогноз заболевания. Для решения данной задачи необходимо проводить оценку функциональных и метаболических изменений опухолевой ткани в процессе лечения. Ультразвуковая допплерография – это неинвазивный, доступный и недорогой метод визуализации, который можно безопасно использовать для повторных измерений. Цель исследования – изучение динамики васкуляризации опухоли ультразвуковым  методом в режиме энергетического допплера для оценки раннего ответа рака молочной железы на неоадъювантную химиотерапию. Материал и методы. Исследование проводилось на базе ФБУЗ ПОМЦ ФМБА России с мая 2017 по август 2019 г. В исследование были включены 63 больных раком молочной железы, которым проводилась неоадъювантная химиотерапия. Оценка кровотока опухоли с использованием допплеровского сканирования проводилась до начала и перед вторым курсом неоадъювантной химиотерапии. Изменения кровоснабжения опухоли на фоне химиотерапии сопоставлялись с патоморфологическим ответом опухоли после оперативного лечения.Результаты. В подавляющем большинстве случаев (78 %) наблюдалось не зависящее от степени лечебного патоморфоза уменьшение количества опухолевых сосудов после первого курса химиотерапии. В 8 случаях повышения васкуляризации после первого  курса неоадъювантной химиотерапии при гистологическом исследовании удаленной опухоли наблюдалось отсутствие ответа/слабый ответ на лечение при отсутствии перитуморального воспаления, в 5 случаях – резкое увеличение количества сосудов вокруг обширных зон интранодулярного некроза и обусловленного им перитуморального воспаления. В целом сопоставление динамики васкуляризации опухоли и  патоморфологического ответа выявило слабую, хотя и статистически значимую отрицательную корреляцию между изменениями кровоснабжения опухоли на фоне химиотерапии и степенью лечебного патоморфоза. Выводы. Не удалось установить однозначной зависимости между реакцией сосудистого русла и ответом опухоли на цитостатическое воздействие. Повышение количества  опухолевых сосудов при отсутствии перитуморального воспаления оказалось  единственной ситуацией, когда изменения опухолевого кровотока на фоне проведения химиотерапии могут быть однозначно интерпретированы как предиктивный критерий отсутствия/слабого ответа опухоли на лечение

PVDF spherical matrix array for high resolution cerebral optoacoustic micro-angiography of rodents.

We developed high-density spherical matrix array based on polyvinylidene difluoride films. Ultrawide bandwidth (0.3-38 MHz) and sub-millimeter sized elements enabled non-invasive cerebrovascular imaging of adult mouse with ~60 µm resolution

STUDY OF CHANGES IN TUMOR BLOOD FLOW FOR THE ASSESSMENT OF EARLY RESPONSE TO NEOADJUVANT CHEMOTHERAPY IN BREAST CANCER PATIENTS

Background. Over the past 20 years, there has been a change in approaches to the treatment of breast cancer, in particular, a significant increase in the role of drug therapy. Breast cancer response to neoadjuvant chemotherapy is currently considered as a surrogate biomarker, which allows evaluation of the clinical course and prognosis of the disease. To solve this problem, it is necessary to assess the functional and metabolic changes in tumor tissue during treatment. Doppler ultrasound is a non-invasive, affordable, and low-cost imaging technique that can be safely used for repeated measurements.The purpose of the study was to study vascular changes in the tumor by power Doppler ultrasound for the evaluation of the early breast cancer response to neoadjuvant chemotherapy.Material and Methods. From May 2017 to August 2019, 63 patients with breast cancer received neoadjuvant chemotherapy. Changes in the tumor blood flow were assessed before starting the treatment and prior to the second course of neoadjuvant chemotherapy using Doppler scanning. Changes in tumor blood floor after chemotherapy were compared with the pathological tumor response after surgical treatment.Results. In the vast majority of cases (78 %), there was a decrease in the number of tumor vessels after the first cycle of neoadjuvant chemotherapy independent of the grade of pathological response. In 8 cases with increased vascularization after the first cycle of neoadjuvant chemotherapy, histological examination of the removed tumor showed no response / weak response to treatment in the absence of peritumoral inflammation. In 5 cases, a sharp increase in the number of vessels around large areas of intranodular necrosis and peritumoral inflammation was observed. In general, a comparison of changes in tumor vascularization and pathological response revealed a weak, although statistically significant, negative correlation between changes in the tumor blood flow after neoadjuvant chemotherapy and pathological response.Conclusion. It was not possible to establish an unambiguous relationship between the reaction of the vascular bed and the tumor response to the cytostatic effect. An increase in the number of tumor vessels in the absence of peritumoral inflammation was the only situation when changes in tumor blood flow during chemotherapy can be unambiguously interpreted as a predictive criterion for the absence / weak response of the tumor to treatment

Simultaneous triple-modality imaging of diffuse reflectance, optoacoustic pressure and ultrasonic scattering using an acoustic-resolution photoacoustic microscope: feasibility study

The letter discusses the opportunity for cost-effective use of conventional optoacoustic hardware to realize additional imaging modalities such as ultrasonic microscopy and diffuse optical reflectometry within the same laser pulse. Optoacoustic methods for deep biomedical visualization are based on pulsed laser illumination of the internal tissue layers with scattered photons, however some of the back-scattered photons can be absorbed by the optoacoustic detector. Thermoelastic extension of the detector's surface provides a probing pulse for an ultrasonic modality while the measurement of the amplitude of the probing ultrasonic pulse allows estimation of the diffuse reflectance from the object under investigation