Visible-Light-Promoted Radical Cascade Cyclization of 2-Vinyl Benzimidazoles: Access to Benzo[4,5]imidazo[1,2-b]isoquinolin- 11(6H)-ones.

A visible-light-enabled photoredox radical cascade cyclization of 2-vinyl benzimidazole derivatives is developed. This chemistry is applicable to a wide range of N-aroyl 2-vinyl benzimidazoles as acceptors, and halo compounds, including alkyl halides, acyl chlorides and sulfonyl chlorides, as radical precursors. The Langlois reagent also serves as an effective partner in this photocatalytic oxidative cascade process. This protocol provides a robust alternative for rendering highly functionalized benzo[4,5]imidazo[1,2-b]isoquinolin-11(6H)-ones.

Different approaches for treating myopic choroidal neovascularization: a network Meta-analysis.

AIM: To evaluate the efficacy of intravitreal injection of anti-vascular endothelial growth factor (anti-VEGF), photodynamic therapy (PDT), and laser treatment (LT) for anatomical and functional improvement in myopic choroidal neovascularization (mCNV) patients. METHODS: Two researchers independently searched PubMed, Cochrane Library, Web of Science, and other databases to screen studies comparing best-corrected vision acuity (BCVA) and foveal center thickness (FCT) changes after mCNV treatment. Post-treatment chorioretinal atrophy (CRA) is a secondary outcome indicator. The retrieval time limit is from the database construction to January 30, 2023. RESULTS: A total of 1072 eyes in 16 articles were included. In the RCTs, intravitreal bevacizumab (IVB) and intravitreal ranibizumab (IVR) were superior to PDT (MD=0.18, 95%CI: 0.02, 0.40, MD=0.18, 95%CI: 0.01, 0.42) in improving BCVA of mCNV patients (P<0.05). The relative effectiveness in improving BCVA, from high to low, appeared to be IVR, intravitreal aflibercept (IVA), IVB, LT, PDT, and sham first followed by IVA (Sham/IVA). While improving the FCT from high to low was IVA, IVR, IVB, PDT. In retrospective studies, the results of BCVA after long-term treatment showed that all the therapeutic effects from high to low was IVA, intravitreal conbercept (IVC), IVR, IVB, IVB/IVR, PDT with IVB/IVR, PDT. The effect of improving FCT was IVA, IVR, IVC, PDT, and IVB from high to low. And in the effects of improving CRA, the IVB appeared to be higher than IVR, while the PDT was the smallest, but none of the differences in the results were statistically significant. CONCLUSION: Anti-VEGF has the best effect on long-term vision improvement in mCNV patients, using IVB or IVR alone to treat mCNV may be better than IVB or IVR combined with PDT. There is no significant difference in the improvement of visual acuity, macular edema, and CRA in mCNV patients treated with any different anti-VEGF drugs.

Enantioselective Benzylation and Allylation of a Crucial Synthon of 3-Amino Oxindole Schiff Base Promoted by a Cinchonidinium Phase Transfer Catalyst to Enable the Effective Preparation of Chiral Quaternary 3-Amino Oxindoles.

3-Amino oxindole Schiff base has been used as an efficient and crucial synthon for highly enantioselective benzylation and allylation with benzyl bromides and allyl bromides in the presence of a 1,3-bis[O(9)-allylcinchonidinium-N-methyl]-2-fluorobenzene dibromide phase transfer catalyst under mild reaction conditions. A broad series of chiral quaternary 3-amino oxindoles were smoothly obtained in good to excellent yields with excellent enantioselectivities (up to 98% ee) with broad substrate generality. A typical scale-up preparation and subsequent Ullman coupling reaction were also smoothly performed, and a special and important chiral spirooxindole benzofuzed pyrrol scaffold with potential pharmaceutical and organocatalytic activities was successfully obtained.

Inactivation of ERK1/2-CREB Pathway Is Implicated in MK801-induced Cognitive Impairment.

OBJECTIVE: Schizophrenia (SZ) is associated with cognitive impairment, and it is known that the activity of cAMP response element binding protein (CREB) decreases in the brain of SZ patients. The previous study conducted by the investigators revealed that the upregulation of CREB improves the MK801-related SZ cognitive deficit. The present study further investigates the mechanism on how CREB deficiency is associated with SZ-related cognitive impairment. METHODS: MK-801 was used to induce SZ in rats. Western blotting and immunofluorescence were performed to investigate CREB and the CREB-related pathway implicated in MK801 rats. The long-term potentiation and behavioral tests were performed to assess the synaptic plasticity and cognitive impairment, respectively. RESULTS: The phosphorylation of CREB at Ser133 decreased in the hippocampus of SZ rats. Interestingly, among the upstream kinases of CREB, merely ERK1/2 was downregulated, while CaMKII and PKA remained unchanged in the brain of MK801-related SZ rats. The inhibition of ERK1/2 by PD98059 reduced the phosphorylation of CREB-Ser133, and induced synaptic dysfunction in primary hippocampal neurons. Conversely, the activation of CREB attenuated the ERK1/2 inhibitor-induced synaptic and cognitive impairment. CONCLUSION: These present findings partially suggest that the deficiency of the ERK1/2-CREB pathway is involved in MK801-related SZ cognitive impairment. The activation of the ERK1/2-CREB pathway may be therapeutically useful for treating SZ cognitive deficits.

Evaluation of renal cortical echogenicity in healthy cats using anisotropic backscatter artifacts and echogenicity differences among internal organs.

BACKGROUND: Renal cortical anisotropic backscatter artifact (CABA) is a hyperechoic region of the renal poles where the insonation of sound beams is perpendicular to the renal tubules within the renal cortex. AIMS: To determine whether renal CABA can be observed in healthy cats and to compare the echogenicity of renal CABA with that of the spleen and liver. MATERIAL AND METHODS: Images of the spleen, liver, kidneys, and urinary bladder were acquired from 30 clinically healthy cats with renal CABA. Echogenicity differences among organs and echo scores within urine were recorded and analyzed. All ultrasound images were acquired using a 7.2-14-MHz linear transducer. Univariate logistic regression was used to assess the associations between the presence of renal CABA and various variables. RESULTS: The prevalence of the renal CABA was 86.7% (26/30) and 93.3% (28/30) according to different observers. The reproducibility of renal CABA is substantial to excellent. The renal CABA echogenicity was greater or equal to the spleen and greater than the hepatic echogenicity in 90.0% of cats (27/30). For comparison with the spleen and liver, there were three and six combinations of echogenicity differences using the CABA and non-CABA regions, respectively. The renal cortical echogenicity in the CABA region was higher than the liver in all subjects. Renal CABA was not associated with age, body weight, gender, body condition score, or lipid droplets in the urinary bladder. CONCLUSION: Renal CABA was present in most healthy cats and could be used for echogenicity comparisons with the liver and spleen.

Activation of protein arginine methyltransferase 1 and subsequent extension of moth lifespan is effected by the ROS/JNK/CREB signaling axis.

Previous studies have demonstrated that high physiological levels of reactive oxygen species induce pupal diapause and extend lifespan in the moth Helicoverpa armigera. This has been shown to occur via protein arginine methyltransferase 1 (PRMT1) blockade of Akt-mediated phosphorylation of the transcription factor FoxO, after which activated FoxO promotes the initiation of diapause. However, it is unclear how PRMT1 is activated upstream of FoxO activity. Here, we show that high reactive oxygen species levels in the brains of H. armigera diapause-destined pupae activate the expression of c-Jun N-terminal kinase, which subsequently activates the transcription factor cAMP-response element binding protein. We show that cAMP-response element binding protein then directly binds to the PRMT1 promoter and upregulates its expression to prevent Akt-mediated FoxO phosphorylation and downstream FoxO nuclear localization. This novel finding that c-Jun N-terminal kinase promotes FoxO nuclear localization in a PRMT1-dependent manner to regulate pupal diapause reveals a complex regulatory mechanism in extending the healthspan of H. armigera.

FoxO induces pupal diapause by decreasing TGFß signaling.

Diapause is a form of dormancy used widely by insects to survive adverse seasons. Previous studies have demonstrated that forkhead box O (FoxO) is activated during pupal diapause initiation in the moth Helicoverpa armigera. However, it is unclear how FoxO induces diapause. Here, we show that knockout of FoxO causes H. armigera diapause-destined pupae to channel into nondiapause, indicating that FoxO is a master regulator that induces insect diapause. FoxO activates the ubiquitin-proteasome system (UPS) by promoting ubiquitin c (Ubc) expression via directly binding to the Ubc promoter. Activated UPS decreases transforming growth factor beta (TGFß) receptor signaling via ubiquitination to block developmental signaling to induce diapause. This study significantly advances the understanding of insect diapause by uncovering the detailed molecular mechanism of FoxO.

What Is Your Diagnosis?

In collaboration with the American College of Veterinary Radiology.

Organocatalytic enantioselective aza-Friedel-Crafts reaction between benzothiazolimines and 2-naphthols for the preparation of chiral 2'-aminobenzothiazolomethyl naphthols.

A bifunctional cinchona squaramide catalyzed enantioselective aza-Friedel-Crafts reaction between 2-naphthols and benzothiazolimines has been developed, and a series of chiral 2'-aminobenzothiazolomethyl naphthols with potential antiproliferative and anthelmintic activities have been successfully and effectively prepared in good to excellent yields (up to 98%) with excellent enantioselectivities (up to >99% ee) even in a scale-up preparation under mild conditions.

Association of Parenteral Anticoagulation Therapy With Outcomes in Non-ST-Segment Elevation Acute Coronary Syndrome Patients Without Invasive Therapy: Findings from the Improving Care for Cardiovascular Disease in China (CCC) project.

Our previous study showed that parenteral anticoagulation therapy (PACT) in the context of aggressive antiplatelet therapy failed to improve clinical outcomes in patients undergoing percutaneous coronary intervention for non-ST-segment elevation acute coronary syndrome (NSTE-ACS). However, the role of PACT in patients managed medically remains unknown. This observational cohort study enrolled patients with NSTE-ACS receiving medical therapy from November 2014 to June 2017 in the Improving Care for Cardiovascular Disease in China-Acute Coronary Syndrome project. Eligible patients were included in the PACT group and non-PACT group. The primary outcomes were in-hospital all-cause mortality and major bleeding. The secondary outcome included minor bleeding. Among 23,726 patients, 8,845 eligible patients who received medical therapy were enrolled. After adjusting the potential confounders, PACT was not associated with a lower risk of in-hospital all-cause mortality (adjusted odds ratio (OR), 1.25; 95% confidence interval (CI), 0.92-1.71; P = 0.151). Additionally, PACT did not increase the incidence of major bleeding or minor bleeding (major bleeding: adjusted OR, 1.04; 95% CI, 0.80-1.35; P = 0.763; minor bleeding: adjusted OR, 1.27; 95% CI, 0.91-1.75; P = 0.156). The propensity score analysis confirmed the primary analyses. In patients with NSTE-ACS receiving antiplatelet therapy, PACT was not associated with a lower risk of in-hospital all-cause mortality or a higher bleeding risk in patients with NSTE-ACS receiving non-invasive therapies and concurrent antiplatelet strategies. Randomized clinical trials are warranted to reevaluate the safety and efficacy of PACT in all patients with NSTE-ACS who receive noninvasive therapies and current antithrombotic strategies.

Targeting integrated stress response regulates microglial M1/M2 polarization and attenuates neuroinflammation following surgical brain injury in rat.

Integrated stress response (ISR) contributes to various neuropathological processes and acting as a therapy target in CNS injuries. However, the fundamental role of ISR in regulating microglial polarization remains largely unknown. Currently no proper pharmacological approaches to reverse microglia-driven neuroinflammation in surgical brain injury (SBI) have been reported. Here we found that inhibition of the crucial ISR effector, activating transcription factor 4 (ATF4), using the RNA interference suppressed the lipopolysaccharide (LPS)-stimulated microglial M1 polarization in vitro. Interestingly, counteracting ISR with a small-molecule ISR inhibitor (ISRIB) resulted in a significant microglial M1 towards M2 phenotype switching after LPS treatment. The potential underlying mechanisms may related to downregulate the intracellular NADPH oxidase 4 (NOX4) expression under the neuroinflammatory microenvironment. Notably, ISRIB ameliorated the infiltration of microglia and improved the neurobehavioral outcomes in the SBI rat model. Overall, our findings suggest that targeting ISR exerts a novel anti-inflammatory effect on microglia via regulating M1/M2 phenotype and may represent a potential therapeutic target to overcome neuroinflammation following SBI.

The association of baseline N-terminal pro-B-type natriuretic peptide with short and long-term prognosis following percutaneous coronary intervention in non-ST segment elevation acute coronary syndrome with multivessel coronary artery disease: a retrospective cohort study.

BACKGROUND: Several studies have shown that N-terminal pro-B-type natriuretic peptide (NT-proBNP) is strongly correlated with the complexity of coronary artery disease and the prognosis of patients with non-ST segment elevation acute coronary syndrome (NSTE-ACS), However, it remains unclear about the prognostic value of NT-proBNP in patients with NSTE-ACS and multivessel coronary artery disease (MCAD) undergoing percutaneous coronary intervention (PCI). Therefore, this study aimed to reveal the relationship between NT-proBNP levels and the prognosis for NSTE-ACS patients with MCAD undergoing successful PCI. METHODS: This study enrolled 1022 consecutive NSTE-ACS patients with MCAD from January 2010 to December 2014. The information of NT-proBNP levels was available from these patients. The primary outcome was in-hospital all-cause death. In addition, the 3-year follow-up all-cause death was also ascertained. RESULTS: A total of 12 (1.2%) deaths were reported during hospitalization. The 4th quartile group of NT-proBNP (> 1287 pg/ml) showed the highest in-hospital all-cause death rate (4.3%) (P < 0.001). Besides, logistic analyses revealed that the increasing NT-proBNP level was robustly associated with an increased risk of in-hospital all-cause death (adjusted odds ratio (OR): 2.86, 95% confidence interval (CI) = 1.16-7.03, P = 0.022). NT-proBNP was able to predict the in-hospital all-cause death (area under the curve (AUC) = 0.888, 95% CI = 0.834-0.941, P < 0.001; cutoff: 1568 pg/ml). Moreover, as revealed by cumulative event analyses, a higher NT-proBNP level was significantly related to a higher long-term all-cause death rate compared with a lower NT-proBNP level (P < 0.0001). CONCLUSIONS: The increasing NT-proBNP level is significantly associated with the increased risks of in-hospital and long-term all-cause deaths among NSTE-ACS patients with MCAD undergoing PCI. Typically, NT-proBN P > 1568 pg/ml is related to the all-cause and in-hospital deaths.

Prevalence of food allergen and aeroallergen sensitization among children in Sichuan province.

Food allergen and aeroallergen sensitization are common allergic diseases worldwide, with widely varying estimates of prevalence in children. Our study investigated the characteristics of ingestion and inhalation allergy among children from Sichuan province in Southwest China, so as to get public awareness of these disorders.A total of 1722 children between 0 and 14 years' old were enrolled in this study. They were outpatients in the West China Second University Hospital during June 2019 to September 2019. Serum specific IgE specific to 10 types of food allergen and 10 types of aeroallergen were estimated. Nutrition indicators were tested by electrochemical luminescence.59.70% children were allergic to at least 1 allergen, comprising 24.90% to aeroallergen and 38.81% to food allergen, respectively, whereas 36.28% children were allergic to both aeroallergen and food allergen. Milk was the most common food allergen, and egg came in second place. With regard to aeroallergen, house dust mite held the maximum proportion (65.02%), whereas dust mite followed behind. Inhalation allergy was more commonly seen in boys than girls. Bronchitis was the most common symptom of both allergies. In addition, the highest incidence age for children to be sensitive to food allergen and aeroallergen were 0∼2 years' old and 3∼5 years' old, respectively. It is worth mentioning that there was no significant difference in nutritional status between children with or without allergic diseases.Our findings reveal that milk, egg, house dust mite, and dust mite are the most common allergens among children in Sichuan province. Boys are more susceptible to aeroallergen than girls. Furthermore, the prevalence of ingestion and inhalation allergy varies from different age groups, and has no correlation with nutritional status. In brief, the analysis of the pattern of food allergen and aeroallergen sensitization is invaluable to effective diagnosis and treatment of allergic diseases.

Association of Parenteral Anticoagulation Therapy With Outcomes in Chinese Patients Undergoing Percutaneous Coronary Intervention for Non-ST-Segment Elevation Acute Coronary Syndrome.

Importance: The association of parenteral anticoagulation therapy with improved outcomes in patients with non-ST-segment elevation acute coronary syndrome was previously established. This benefit has not been evaluated in the era of dual antiplatelet therapy and percutaneous coronary intervention. Objective: To evaluate the association between parenteral anticoagulation therapy and clinical outcomes in patients with non-ST-segment elevation acute coronary syndrome undergoing percutaneous coronary intervention. Design, Setting, and Participants: This cohort study included 8197 adults who underwent percutaneous coronary intervention for non-ST-segment elevation acute coronary syndrome from January 1, 2010, to December 31, 2014, at 5 medical centers in China. Patients receiving parenteral anticoagulation therapy only after percutaneous coronary intervention were excluded. Exposures: Parenteral anticoagulation therapy. Main Outcomes and Measures: The primary outcome was in-hospital all-cause death and in-hospital major bleeding as defined by the Bleeding Academic Research Consortium definition (grades 3-5). Results: Of 6804 patients who met the final criteria, 5104 (75.0%) were male, with a mean (SD) age of 64.2 (10.4) years. The incidence of in-hospital death was not significantly different between the patients who received and did not receive parenteral anticoagulation therapy (0.3% vs 0.1%; P = .13) (adjusted odds ratio, 1.27; 95% CI, 0.38-4.27; P = .70). A similar result was found for myocardial infarction (0.3% vs 0.3%; P = .82) (adjusted odds ratio, 0.77; 95% CI, 0.29-2.07; P = .61). In-hospital major bleeding was more frequent in the parenteral anticoagulation group (2.5% vs 1.0%; P < .001) (adjusted odds ratio, 1.94; 95% CI, 1.24-3.03; P = .004). At a median (interquartile range) follow-up of 2.96 years (1.93-4.46 years), all-cause death was not significantly different between the 2 groups (adjusted hazards ratio, 0.87; 95% CI, 0.71-1.07; P = .19), but the incidence of major bleeding was higher in the parenteral anticoagulation group (adjusted hazards ratio, 1.43; 95% CI, 1.01-2.02; P = .04). The propensity score analysis confirmed these primary analyses. Conclusions and Relevance: In the patients undergoing percutaneous coronary intervention for non-ST-segment elevation acute coronary syndrome, parenteral anticoagulation therapy was not associated with a lower risk of all-cause death or myocardial infarction but was significantly associated with a higher risk of major bleeding. These findings raise important safety questions about the current practice of routine parenteral anticoagulation therapy while we await randomized trials of this practice.

Comparison of the physical and thermodynamic stability of amorphous azelnidipine and its coamorphous phase with piperazine.

A major challenge in drug development is that the majority of drugs are water insoluble, and a powerful method to conquer this obstacle is to transfer a crystalline drug into its amorphous phase (AP) or coamorphous phase (CAP) with a coformer. In the present study, the physical and chemical stabilities of an AP and a CAP based on the dihydropyridine calcium ion antagonist azelnidipine (AZE) were investigated using thermal analysis and a solution chemistry method. The identification of two APs (named α-AP and ß-AP, from crystalline α-AZE and ß-AZE, respectively) and one AZE-piperazine CAP was attempted using powder X-ray diffraction, temperature modulated differential scanning calorimetry and Fourier-transform infrared spectroscopy. The transition thermodynamics from the two APs and the CAP to stable crystalline ß-AZE (ß-Cry) were investigated using a solubility method. The solubility of the two APs, the CAP and ß-Cry in 0.01 M HCl medium at 298, 304, 310, 316 and 322 K was investigated; the values obtained were used to calculate the thermodynamic parameters of the transition reaction. The transition temperatures of α-AP, ß-AP and the CAP to form ß-Cry in 0.01 M HCl were 237.7, 400.3, and 231.4 K, respectively. The glass transition temperature (T g) values of α-AP, ß-AP and the CAP were 365.5, 358.9 and 347.6 K, respectively, indicating a high physical stability for α-AP. However, ß-AP proved to be the most thermodynamically stable form at room temperature compared with α-AP and CAP in the 0.01 M HCl medium. As evidenced by those observations, no general relationship occurred between the solid physical stability and the solution chemical stability for AP and CAP. The kinetics of the solid-state decomposition, studied using DSC analysis, showed that the activation energies for decomposition of α-AP, ß-AP and CAP at high temperatures were 133.0, 114.2 and 131.6 kJ mol-1, respectively.

Oxidative stress affects retinal pigment epithelial cell survival through epidermal growth factor receptor/AKT signaling pathway.

AIM: To investigate the cross-talk between oxidative stress and the epidermal growth factor receptor (EGFR)/AKT signaling pathway in retinal pigment epithelial (RPE) cells. METHODS: Human RPE cell lines (ARPE-19 cell) were treated with different doses of epidermal growth factor (EGF) and hydrogen peroxide (H2O2). Cell viability was determined by a methyl thiazolyl tetrazolium assay. Cell proliferation was examined by a bromodeoxyuridine (BrdU) incorporation assay. EGFR/AKT signaling was detected by Western blot. EGFR localization was also detected by immunofluorescence. In addition, EGFR/AKT signaling was intervened upon by EGFR inhibitor (erlotinib), PI3K inhibitor (A66) and AKT inhibitor (MK-2206), respectively. H2O2-induced oxidative stress was blocked by antioxidant N-acetylcysteine (NAC). RESULTS: EGF treatment increased ARPE-19 cell viability and proliferation through inducing phosphorylation of EGFR and AKT. H2O2 inhibited ARPE-19 cell viability and proliferation and also suppressed EGF-stimulated increase of RPE cell viability and proliferation by affecting the EGFR/AKT signaling pathway. EGFR inhibitor erlotinib blocked EGF-induced phosphorylation of EGFR and AKT, while A66 and MK-2206 only blocked EGF-induced phosphorylation of AKT. EGF-induced phosphorylation and endocytosis of EGFR were also affected by H2O2 treatment. In addition, antioxidant NAC attenuated H2O2-induced inhibition of ARPE-19 cell viability through alleviating reduction of EGFR, and phosphorylated and total AKT proteins. CONCLUSION: Oxidative stress affects RPE cell viability and proliferation through interfering with the EGFR/AKT signaling pathway. The EGFR/AKT signaling pathway may be an important target in oxidative stress-induced RPE cell dysfunction.

Combining Internal Carotid Ligation with Low-Flow Bypass for Treating Large-Giant Cavernous Sinus Segment Aneurysms: A Report of Four Cases.

OBJECTIVE: We summarize the treatment effectiveness and experience of 4 patients who underwent internal carotid ligation combined with low-flow bypass as a treatment for large-giant cavernous sinus segment (CS ICA) aneurysms. METHODS: Surgery-suitable patients with large-giant CS ICA aneurysms received internal carotid ligation combined with low-flow superficial temporal artery-middle cerebral artery bypass surgery. All the patients were followed up for aneurysm prognosis, anastomosis patency, and occurrences of low-flow-related ischemic complications. RESULTS: Four suitable cases between 2012 and 2015 were studied. They consisted of 1 man and 3 women, with the mean age of 56.3 ± 11.9 years. Maximum and minimum aneurysm diameter were 26 mm and 20 mm, respectively, with an average of 22.3 ± 2.6 mm. During surgery, the mean blockage time of the middle cerebral artery was 19.3 ± 1.3 minutes. Postoperative computed tomography angiography examination indicated that thrombosis could be found in the aneurysm lumen. No patient was found with low-flow-related ischemic complications after surgery. The mean postoperative follow-up time was 25.0 ± 10.4 months. During the follow-up period, no patient showed low-flow-related ischemic complications or aneurysm recurrence. CONCLUSIONS: For patients with large-giant CS ICA aneurysms, treatment of internal carotid ligation combined with low-flow superficial temporal artery-middle cerebral artery bypass surgery was an effective and safe surgical strategy. To improve surgery safety and for appropriate selection of surgery cases, the details, risks, and benefits associated with the surgery should be considered by the surgeon.

The progression of CD56+ myeloid sarcoma: A case report and literature review.

The current study presents a case of cluster of differentiation (CD)56+ myeloid sarcoma in a patient that initially presented with skin lesions, and provides evidence for the clinical and differential diagnosis of myeloid sarcoma. The patient of the present case report was a 65-year-old man who was admitted to hospital with a six-month history of bilateral purple-red papules and nodules, which were present on the upper limbs of the patient and had spread over his whole body one month prior to admission to the hospital. Pathological examination demonstrated a diffuse infusion of primitive round cells at the papillary dermis and subcutaneous tissues. The infiltrated cells were 40-60 µm in diameter and morphologically identical. Immunohistochemical examination revealed that the cells expressed myeloperoxidase, CD56, CD43 and T-cell intracytoplasmic antigen. In addition, several cells expressed CD34, and 90% of the cells expressed Ki67. While the majority of cells in myeloid sarcoma do not express CD56, the present case was a myeloid sarcoma that expressed CD56, which is extremely rare. The sarcoma in the present patient progressed rapidly, and the patient died eight months following the onset of disease. Clinicians should be aware of CD56+ myeloid sarcoma, which is easily misdiagnosed and inappropriately treated. Consequently, myeloid sarcoma may have a high malignancy and poor outcome for patients.