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In this work, we investigate the mass spectrum of $1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets in the framework of the meson mass matrix and Regge phenomenology. The results are compared with the values from different phenomenological models and may be useful for the assignment of the $1^{1}D_{2}$ and $1^{3}D_{2}$ meson nonets in the future., Comment: 13 pages, 6 figures

Jiahui Gu, Wantong Wang, Shizhuo Wang Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang, Liaoning Province, 110001, People’s Republic of ChinaCorrespondence: Shizhuo WangDepartment of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Sanhao Street No. 36, Heping District, Shenyang, Liaoning, People’s Republic of ChinaTel +86 18940257692Email zhuo1014@hotmail.comIntroduction and Hypothesis: Perivascular epithelioid cell neoplasms (PEComas) are rare mesenchymal tumors that originate from perivascular epithelioid cells. The uterus is the second most common organ to be affected by PEComa. Most PEComas are benign and the prognosis is usually good. Surgery is the main treatment at present, and adjuvant therapy is mainly used for malignant cases. However, because of the lack of described cases, the best diagnosis and treatment of these tumors cannot be determined.Methods: From 2009 to 2020, 13 patients from Shengjing Hospital (China Medical University), with uterine PEComa, who met the inclusion criteria and appropriate pathological diagnosis were enrolled in this study. Clinical, pathological, and therapeutic features were retrospectively analyzed to determine the best approach towards diagnosis and treatment.Results: All the enrolled patients underwent surgical treatment; four of them had a malignant PEComa. Three of the malignant patients received chemotherapy after surgery; among them, one died, another showed no obvious recurrence after regular re-examination, and the third did not undergo any further treatment despite short-term recurrence. However, upon regular re-examination, no progress was observed. The fourth malignant patient did not receive chemotherapy after surgery and showed no obvious recurrence during regular reviews.Conclusion: The preoperative diagnosis of uterine PEComa lacks specificity and therefore is often confused with uterine leiomyoma or leiomyosarcoma.

Mortality of twins relative to singletons is no greater today among African ethnicities that once practiced twin infanticide. We introduce data on historic twin infanticide and merge it with birth records from 23 African countries. We use the full sample, a border sample of adjacent societies with and without past twin infanticide, and a sample of twins. All three samples provide no evidence that past twin infanticide predicts greater differential twin mortality today. Twin infanticide and negative attitudes towards twins were suppressed by Africans, missionaries, and colonial governments. Where these channels were weak, we find evidence of greater twin mortality today.

Rui Hou,1 Zhuo Yang,1 ShiZhuo Wang,1 DaMing Chu,1 Qifang Liu,1 Jia Liu,1 Luo Jiang2 1Department of Obstetrics and Gynecology, 2Department of Ultrasound, Shengjing Hospital Affiliated to China Medical University, Shenyang, People’s Republic of China Abstract: Ovarian cancer accounts for the major part of the mortality attributable to female reproductive system malignant tumors worldwide. Recently, the incidence of ovarian cancer has been increasing annually, and there remains a lack of suitable treatment methods that can significantly improve the 5-year survival rates of patients. Therefore, it is necessary to identify more effective treatments for ovarian cancer. It is established that microRNAs (miRNAs) have important roles in the diagnosis and treatment of ovarian cancer and a specific miRNA, miR-762, can promote the development of a variety of tumors. Menin is encoded by MEN1, a tumor suppressor gene, that is usually downregulated in ovarian cancer. In this study, we evaluated the expression levels of miR-762 and menin in ovarian cancer tissues and demonstrated that they were correlated. In addition, we found that miR-762 can downregulate the expression of menin through a binding site in its 3'-UTR and consequently upregulate the Wnt cell signaling pathway to promote the development of ovarian cancer. These results indicate that miR-762 is a promising potential target for the treatment of ovarian cancer. Keywords: miR-762, menin, ovarian cancer&nbsp