Enhanced outdoor visual localization using Py-Net voting segmentation approach.

Camera relocalization determines the position and orientation of a camera in a 3D space. Althouh methods based on scene coordinate regression yield highly accurate results in indoor scenes, they exhibit poor performance in outdoor scenarios due to their large scale and increased complexity. A visual localization method, Py-Net, is therefore proposed herein. Py-Net is based on voting segmentation and comprises a main encoder containing Py-layer and two branch decoders. The Py-layer comprises pyramid convolution and 1 × 1 convolution kernels for feature extraction across multiple levels, with fewer parameters to enhance the model's ability to extract scene information. Coordinate attention was added at the end of the encoder for feature correction, which improved the model robustness to interference. To prevent the feature loss caused by repetitive structures and low-texture images in the scene, deep over-parameterized convolution modules were incorporated into the seg and vote decoders. Landmark segmentation and voting maps were used to establish the relation between images and landmarks in 3D space, reducing anomalies and achieving high precision with a small number of landmarks. The experimental results show that, in multiple outdoor scenes, Py-Net achieves lower distance and angle errors compared to existing methods. Additionally, compared to VS-Net, which also uses a voting segmentation structure, Py-Net reduces the number of parameters by 31.85% and decreases the model size from 236MB to 170 MB.

Safety and feasibility assessment of extending the flushing interval in totally implantable venous access port flushing during the non-treatment stage for patients with breast cancer.

Aim: To investigate the safety and feasibility of extending the flushing interval for the totally implantable venous access port (TIVAP) during the non-treatment stage in patients with breast cancer (BC) by retrospectively analyzing the patients' clinical data, including the incidence of TIVAP-related complications. Methods: This single-center retrospective study included patients with BC who underwent TIVAP implantation at our hospital between January 2018 and March 2021 during their non-treatment phase and visited the hospital regularly for TIVAP flushing. Among the 1013 patients with BC who received TIVAP implantation, 617 patients were finally included on the basis of the inclusion and exclusion criteria and divided into three groups according to the length of the flushing interval: group 1 (≤30 days, n = 79), group 2 (31-90 days, n = 66), and group 3 (91-120 days, n = 472). The basic characteristics of patients in each group and the incidence of TIVAP-related complications (catheter obstruction, infection, and thrombosis) were analyzed. Results: No significant intergroup differences were observed in age, body mass index (BMI), tumor stage, pathological staging, implantation approach, chemotherapy regimen, duration of treatment, and TIVAP-related blood return rate (P > 0.05). Among patients from all three groups, 11 cases of catheter pump-back without blood and eight cases of TIVAP-related complications such as infection, thrombosis, and catheter obstruction were recorded. However, no significant differences in TIVAP-related complications were observed among the three groups (P > 0.05). Conclusion: Extending the TIVAP flushing interval beyond three months during the non-treatment stage in BC patients is safe and feasible and did not increase the incidence of TIVAP-related complications.

Vascular NRP2 triggers PNET angiogenesis by activating the SSH1-cofilin axis.

BACKGROUND: Angiogenesis is a critical step in the growth of pancreatic neuroendocrine tumors (PNETs) and may be a selective target for PNET therapy. However, PNETs are robustly resistant to current anti-angiogenic therapies that primarily target the VEGFR pathway. Thus, the mechanism of PNET angiogenesis urgently needs to be clarified. METHODS: Dataset analysis was used to identify angiogenesis-related genes in PNETs. Immunohistochemistry was performed to determine the relationship among Neuropilin 2 (NRP2), VEGFR2 and CD31. Cell proliferation, wound-healing and tube formation assays were performed to clarify the function of NRP2 in angiogenesis. The mechanism involved in NRP2-induced angiogenesis was detected by constructing plasmids with mutant variants and performing Western blot, and immunofluorescence assays. A mouse model was used to evaluate the effect of the NRP2 antibody in vivo, and clinical data were collected from patient records to verify the association between NRP2 and patient prognosis. RESULTS: NRP2, a VEGFR2 co-receptor, was positively correlated with vascularity but not with VEGFR2 in PNET tissues. NRP2 promoted the migration of human umbilical vein endothelial cells (HUVECs) cultured in the presence of conditioned medium PNET cells via a VEGF/VEGFR2-independent pathway. Moreover, NRP2 induced F-actin polymerization by activating the actin-binding protein cofilin. Cofilin phosphatase slingshot-1 (SSH1) was highly expressed in NRP2-activating cofilin, and silencing SSH1 ameliorated NRP2-activated HUVEC migration and F-actin polymerization. Furthermore, blocking NRP2 in vivo suppressed PNET angiogenesis and tumor growth. Finally, elevated NRP2 expression was associated with poor prognosis in PNET patients. CONCLUSION: Vascular NRP2 promotes PNET angiogenesis by activating the SSH1/cofilin/actin axis. Our findings demonstrate that NRP2 is an important regulator of angiogenesis and a potential therapeutic target of anti-angiogenesis therapy for PNET.

Erectile dysfunction in Fragile X patients.

AIM: To report the clinical experience during collecting sperm samples in the Fragile X syndrome (FXS) male patients. METHODS: Two different polymerase chain reaction (PCR) based methods were used for the molecular diagnosis of FXS. Sperm collection was done mostly according to the laboratory manual of the World Health Organization. RESULTS: We failed to collect sperm samples from five Fragile X subjects aged 18-60 years as a result of an unexpected erectile dysfunction (ED). Multiple examinations of the same subject at different times, and of different subjects from different provinces examined by different physicians, showed the same result consistently in all the five subjects. CONCLUSION: Erectile reflex is an instinctive response in all healthy males. The absence of erection can be caused by hormonal, physical or neuronal malfunction. As hormonal profiles were reported to be generally normal in Fragile X men, we propose that an unknown physical factor or the neuronal circuit, or both, underlying the erection is compromised. The finding of this symptom in Fragile X patients may help better understand the clinical spectrum and pathogeneses of the disease.

[Clinical characteristics and genetic analyses of familial recurrent moles].

OBJECTIVE: To probe the clinical characteristics and genetic origin of familial recurrent mole (FRM). METHODS: Two cases of FRM were reported retrospectively. Microsatellite polymorphism was used to determine the genetic origin of the two FRM and other six sporadic moles from other independent families. RESULTS: The two FRM patients came from two independent families. Both of them had more than two times of hydatidiform moles and the same condition had happened to their sisters. The last mole from each of these two patients was identified as biparental complete hydatidiform mole (BiCHM). Among the six sporadic moles, one was partial hydatidiform mole (PHM), which was identified as triploid with one haploid maternal set of chromosomes and two haploid paternal sets of chromosomes. The other five sporadic moles were all androgenetic complete hydatidiform mole (AnCHM), which lacked maternal genetic material. The two women with FRM developed into persistent trophoblastic disease (PTD) and gained complete remission (CR) after medical therapy and/or pulmonary lobectomy. CONCLUSIONS: FRM is exceedingly rare. Most of them are biparental in origin. It ought to be an important step to identify the genetic origin in evaluating the outcomes of the women with recurrent hydatidiform moles.

[Efficacy of combined gemcitabine and cisplatin in the treatment of advanced non-small cell lung cancer].

BACKGROUND: No chemotherapeutic regimen and agent are effective for most patients with advanced non-small cell lung cancer (NSCLC). This study is designed to evaluate the efficacy and toxicity of the combination of gemcitabine and cisplatin in the treatment of NSCLC.. METHODS: Sixty cases of NSCLC in stage III and IV were treated with gemcitabine 1200mg/m² by intravenous infusion on 1st and 8th days, and cisplatin 100mg/m² by intravenous infusion on 1st day or 30mg/m² by intravenous infusion on 1st and 8th days in a 28-day cycle. Each patient was treated at least for 2 cycles. RESULTS: An objective response was obtained in 46.67% of patients (3 complete and 25 partial responses), whereas 22 patients had no change and 10 patients were progressive. The response rate was 57.14% in patients without prior chemotherapy and 22.22% in patients with prior treatment. Significant difference existed between the two groups (P < 0.05). The main toxicities were leukopenia and thrombocytopenia, but didn't influence the chemotherapy. CONCLUSIONS: The combination of gemcitabine and cisplatin is a feasible, well-tolerated and effective scheme in the treatment of advanced NSCLC.

Identification of the DNA binding element of the human ZNF333 protein.

ZNF 333 is a new and sole gene containing two KRAB domains which has been identified currently. It is a member of subfamilies of zinc finger gene complex which had been localized on chromosome 19p13.1. The ZNF333 gene mainly encodes a 75.5 kDa protein which contains 10 zinc finger domains. Using the methods of random oligonucleotide selection assay, electromobility gel shift assay and luciferase activity assay, we found that ZNF333 recognized the specific DNA core binding sequence ATAAT. Moreover, these data indicated that the KRAB domain of ZNF333 really has the ability of transcriptional repression.

[Novel mutation of fibrillin 1 gene cause ectopia lentis in a Chinese family].

OBJECTIVE: To identify the mutation gene of a Chinese family with ectopia lentis. METHODS: Clinical observation and pedigree analysis were undertaken in a family with ectopia lentis. Venous blood was drawn from 7 affected and 3 unaffected subjects. Genomic DNA was extracted. Linkage to the fibrillin 1 (FBN1) locus was not excluded. Mutation of this gene was screened by PCR of FBN1 exons and direct sequencing. PCR and restrictive endonuclease digestion were applied for population study. RESULTS: A missense mutation G640A in exon six of FBN1 gene was identified in affected patients of this Chinese family. The correspond amino acid change was Gly214Ser. Restrictive endonuclease site Eag I was eliminated. This mutation was not found in unaffected family members of this family nor it was found among 50 unrelated normal controls. CONCLUSIONS: A novel mutation of FBN1 gene with Glycine to Serine change is responsible for the ectopia lentis patients in a Chinese family.