[Characteristic and prognostic significance of leukemia stem cells associated antigens expressions in t (8;21) acute myeloid leukemia].

Objective: To investigate the characteristic and prognostic significance of leukemia stem cells associated antigens expressions including CD34, CD38, CD123, CD96 and TIM-3 in t (8;21) AML. Methods: Bone marrow samples of 47 t (8;21) AML patients were collected at diagnosis from October 2015 to April 2018 in Peking University Peoples' Hospital, then flow cytometry method was performed to detect the expression frequencies of CD34, CD38, CD123, CD96 and TIM-3 to analyze the relationship between leukemia stem cells associated antigens expressions and relapse. Results: Of 47 t (8;21) AML patients tested, the median percentages of CD34(+)CD38(-), CD34(+) CD38(-)CD123(+), CD34(+)CD38(-) CD96(+) and CD34(+) CD38(-) TIM-3(+) cells among nucleated cells were 2.37%, 0.24%, 0.27% and 0.06%, respectively. All the frequencies of CD34(+)CD38(-), CD34(+)CD38(-)CD123(+), CD34(+)CD38(-)CD96(+) and CD34(+) CD38(-)TIM-3(+) cells had no impact on the achievement of CR after the first course of induction. All higher frequencies of CD34(+)CD38(-), CD34(+)CD38(-)CD123(+), CD34(+)CD38(-)CD96(+) cells were related to higher 2-year CIR rate. Whereas, the frequency of CD34(+) CD38(-) TIM-3(+) cells had no impact on CIR rate. Both high frequency of CD34(+) CD38(-) cells and the high level of minimal residual diseases (patients with <3-log reduction in the RUNX1-RUNX1T1 transcript level after the second consolidation therapy) were independent poor prognostic factors of CIR[P=0.025, HR=6.9 (95%CI 1.3-37.4) ; P=0.031, HR=11.1 (95%CI 1.2-99.2) ]. Conclusion: Different leukemia stem cells associated antigens had distinct prognostic significance in t (8;21) AML. High frequencies of CD34(+) CD38(-), CD34(+) CD38(-) CD123(+) and CD34(+)CD38(-)CD96(+) cells at diagnosis predicted relapse in patients with t (8;21) AML.

Sample preincubation strategy for sensitive and quantitative detection of clenbuterol in swine urine using a fluorescent microsphere-based immunochromatographic assay.

We describe an ultrasensitive and quantitative immunochromatographic assay to determine the amount of clenbuterol (CLB) in swine urine. In this study, fluorescein isothiocyanate polystyrene fluorescent microspheres were used as probes. A sample preincubation strategy was introduced to this immunochromatographic assay. Results showed that the strategy evidently improved the sensitivity and accuracy of lateral flow assay. The method was completed in 20 min, and a half-maximal inhibitory concentration of 0.13 µg liter(-1) was obtained. The limit of detection of the proposed method to determine CLB in swine urine was 0.01 µg liter(-1), which was lower than the limit of detection of immunochromatographic assays without preincubation. Intra- and interday recoveries of spiked swine urine ranged from 85.0 to 107.5%. The relative standard deviation values of the preincubated test strip ranged from 2.7 to 12.5%. Analysis of the CLB in swine urine samples showed that the result obtained from the lateral flow assay is consistent with that obtained from a commercial enzyme-linked immunosorbent assay kit. Our results suggest that the developed fluorescent microsphere-based immunochromatographic assay may be useful as a rapid screening method to detect CLB quantitatively.

The performance of BRCA1 immunohistochemistry for detecting germline, somatic, and epigenetic BRCA1 loss in high-grade serous ovarian cancer.

BACKGROUND: BRCA1 expression can be lost by a variety of mechanisms including germline or somatic mutation and promotor hypermethylation. Given the potential importance of BRCA1 loss as a predictive and prognostic biomarker in high-grade serous ovarian cancer, we sought to evaluate the utility of BRCA1 immunohistochemistry (IHC) in screening for BRCA1 loss by germline, somatic, and epigenetic mechanisms. PATIENTS AND METHODS: Patients with advanced high-grade serous ovarian cancer who had previously undergone germline BRCA1 testing were identified. Samples from each tumor were stained for BRCA1 and reviewed independently by two pathologists blinded to BRCA status. Tumors with abnormal BRCA1 IHC and wild-type germline testing underwent further evaluation for somatic BRCA1 mutations and promoter hypermethylation. McNemar's test was used to determine the association of BRCA1 IHC with germline BRCA1 mutations and BRCA1 loss through any mechanism. Kaplan-Meier methods were used to estimate overall survival (OS), and the log-rank test was used to assess differences between groups. RESULTS: Inter-rater reliability between the two pathologists on BRCA IHC interpretation was very good (kappa coefficient 0.865, P = 0.16; McNemar's test). BRCA1 IHC was abnormal in 36% (48/135) of cases. When compared with germline BRCA1 status, BRCA1 IHC had a high negative predictive value (95.4%) but a low positive predictive value (PPV, 52.1%). When accounting for promoter hypermethylation and somatic mutations as alternative methods of BRCA1 loss, the PPV rose to 87.5%. Five-year OS rate was 49.6% [95% confidence interval (CI) 26.3% to 69.3%] for patients with germline BRCA1 mutations, 50.4% (95% CI 27.5% to 69.5%) for germline wild-type BRCA1 and abnormal IHC, and 52.1% (95% CI 38.4% to 64.2%) for germline wild-type BRCA1 and normal IHC (P = 0.92). CONCLUSIONS: BRCA1 IHC interpretation was a highly reproducible and accurate modality for detecting germline, somatic, or epigenetic mechanisms of BRCA1 loss. These results support further development of BRCA1 IHC as a potential biomarker for BRCA1 loss in high-grade serous ovarian cancer.

[Vitamin D-deficiency rickets: a case report from Burkina Faso]. / Le rachitisme carentiel: une observation au Burkina Faso.

Deficiency rickets results from a deficiency of vitamin D that is responsible for deficient calcium absorption, leading to failure of bone mineralization and cartilage bone growth, especially in children. We report the case of a 9-year-old girl who shows signs of rickets. Her family history, which includes similar malformations in several family members, led us to suggest vitamin D-resistant rickets, but all laboratory tests and response to treatment indicated deficiency rickets. Prophylaxis, at least for some very poor people, should be proposed for certain populations at risk, even in tropical zones.

[Aorto-pulmonary fistula found in a 9 year old girl at the Yalgado Ouedraogo University Hospital, Ouagadougou Burkina Faso]. / Fistule Aorto-pulmonaire decouverte chez une fillette de 9 ans au Centre Hospitalier Universitaire Yalgado Ouedraogo, Ouagadougou Burkina Faso.

The CS child, aged 9, is evacuated from a health center located 200km away from Ouagadougou (capital of BF) for decompensated heart failure. Clinically we noted a syndrome of congestive heart failure. No obvious cause has been found outside of the advancing age of parents (50 years) and the potential risks of rubella infection. A Doppler echocardiography revealed a fistula aorto-pulmonary 17mm wide associated with a pericardial effusion of average circumferential abundance and a dilation of the left ventricular. Pulmonary radiography showed a large cardiomegaly and left pleurisy. The discovery of congenital heart disease between 2 and 4 years is very rare but the prognosis is good with surgical treatment.

L'enfant C.S âgée de 9 ans est évacuée d'une formation sanitaire située à 200km de Ouagadougou (capitale du BF) pour cardiopathie décompensée. Cliniquement est noté un syndrome d'insuffisance cardiaque globale. Aucune cause évidente n'est retrouvée en dehors de l'âge avancé des parents (50 ans environ) et des risques potentiels d'infection rubéolique. L'échocardiographie Doppler révèle une fistule aorto-pulmonaire large de 17mm associée à un épanchement péricardique de moyenne abondance circonférentielle et une dilatation du ventricule gauche. La radiographie pulmonaire a noté une volumineuse cardiomégalie et une pleurésie gauche. Cette cardiopathie congénitale de découverte habituelle entre 2 et 4 ans est très rare et de pronostic favorable avec le traitement chirurgical.

[Bessef Hogen's disease, or exostosis disease, with spinal cord compression: a case in the service of the Paediatric CHU Ouedraogo, Ouagadougou, BF]. / La Maladie de Bessef Hogen ou Maladie Exostosante Avec Compression Medullaire: A Propos d'un Cas Dans le Service de Pediatrie du chu Yalgado Ouedraogo, Ouagadougou, B.F.

CA, 14 old years, female, born last uterine siblings of 9 children, 4 died of various causes, was admitted in the pediatric service of CHU-YO for functional impairment of the lower limbs. Physical examination revealed swelling and deformation harsh, uneven surfaces, the circumferential upper and lower limbs and lumbar spine associated with spastic paraplegia. Sphincter disturbances accompany this clinical picture. The radiographic bone marrow hypertrophy individually with images of exostosis at the epiphyses. Multiple exostosis or BESSEF Hogen's disease is rare and has a reserve functional prognosis because of outcome of low spinal cord compression and vascular compression. We felt it appropriate to bring this case discovered during our clinical practice because of its rarity and the risk of malignant degeneration.

CA, âgée de 14 ans, de sexe féminin, dernière née d'une fratrie utérine de 9 enfants dont 4 sont décédés de causes diverses, est admise dans le service de pédiatrie du CHU-YO pour impotence fonctionnelle des membres inférieurs. L'examen physique révèle des déformations et des tuméfactions dures, à surfaces irrégulières, circonférentielles aux membres inférieurs et supérieurs et au rachis dorsolombaire associées à une paraplégie spasmodique. Des troubles sphinctériens accompagnent ce tableau clinique.La radiographie osseuse individualise une hypertrophie osseuse avec des images d'exostose au niveau des épiphyses.Affection rare, l'exostose ou maladie des exostoses multiples de BESSEF HOGEN a un pronostic fonctionnel réservé du fait des compressions médullaires basses et vasculaires. Nous avons jugé opportun de rapporter ce cas découvert lors de notre pratique clinique à cause de sa rareté et du risque de dégénérescence maligne.