Reduced or interrupted blood flow is an important pathological and physiological process in femoral head necrosis,so understanding the blood flow of the femoral head can help better understand the progression of femoral head necrosis.With the continuous development and improvement of imaging technology,the technical methods for detecting the blood flow of the femoral head are gradually being widely applied,allowing clinical physicians to better understand the blood flow situation of patients with femoral head necrosis.However,at present,the prognosis prediction of femoral head necrosis still mainly revolves around factors such as the area and angle of femoral head necrosis.Therefore,this article explores imaging techniques covering studies such as femoral head vascular imaging or blood flow perfusion parameters,summarizes their application research progress in femoral head necrosis blood flow assessment,and aims to provide more objective basis for exploring the prevention and prognosis of femoral head necrosis from the perspective of femoral head blood flow.

Reduced or interrupted blood flow is an important pathological and physiological process in femoral head necrosis,so understanding the blood flow of the femoral head can help better understand the progression of femoral head necrosis.With the continuous development and improvement of imaging technology,the technical methods for detecting the blood flow of the femoral head are gradually being widely applied,allowing clinical physicians to better understand the blood flow situation of patients with femoral head necrosis.However,at present,the prognosis prediction of femoral head necrosis still mainly revolves around factors such as the area and angle of femoral head necrosis.Therefore,this article explores imaging techniques covering studies such as femoral head vascular imaging or blood flow perfusion parameters,summarizes their application research progress in femoral head necrosis blood flow assessment,and aims to provide more objective basis for exploring the prevention and prognosis of femoral head necrosis from the perspective of femoral head blood flow.

BACKGROUND:Up to now,there is no literature on the relationship between blood laboratory tests and the course of nontraumatic osteonecrosis of femoral head in different stages.It is necessary to further explore and analyze so as to better clarify the influencing factors of nontraumatic osteonecrosis of femoral head. OBJECTIVE:To analyze the relationship between blood laboratory indicators and the course of nontraumatic osteonecrosis of the femoral head by the Association Research Circulation Osseous(ARCO),thus exploring the influencing factors of blood laboratory indicators on the course of nontraumatic osteonecrosis of the femoral head. METHODS:This study used a retrospective study design.A total of 2 103 patients with osteonecrosis of the femoral head were retrieved from Wangjing Hospital of China Academy of Chinese Medical Sciences database,and 1 075 patients with nontraumatic osteonecrosis of the femoral head were ultimately included based on inclusion and exclusion criteria.Patient age,gender,body mass index,and blood laboratory test results were collected.Blood laboratory tests included low-density lipoprotein,total cholesterol,triglycerides,high-density lipoprotein,apolipoprotein β,apolipoprotein α1,uric acid,total protein quantitative,alkaline phosphatase,activated partial thromboplastin time,prothrombin time,prothrombin time International Normalized Ratio,prothrombin time activity,fibrinogen quantitative,coagulation time of thrombin,D-dimer,total iron binding capacity,and platelet count.The indicators of patients with different age groups and different ARCO stages were compared,and multiple Logistic regression analysis was applied to explore the influencing factors of ARCO stages in osteonecrosis of the femoral head. RESULTS AND CONCLUSION:(1)There were statistical differences in total cholesterol,uric acid,prothrombin time,prothrombin time International Normalized Ratio,and D-dimer among ARCO stages in the young group(P<0.05).Among young patients in ARCO stage II,total cholesterol levels were higher than those in ARCO stage III(P<0.05).Uric acid levels in ARCO stage IV were higher than those in ARCO stage II and III(P<0.05).Prothrombin time and prothrombin time International Normalized Ratio were shorter in ARCO stage IV and II than in ARCO stage III(P<0.05).D-dimer levels were higher in ARCO stage III and IV than in ARCO stage II(P<0.05).(2)There were statistically significant differences in high-density lipoprotein,coagulation time of thrombin,and D-dimer among ARCO stages in the middle-aged group(P<0.05).Among middle-aged patients in ARCO stage IV,high-density lipoprotein levels were higher than those in ARCO stages II and III(P<0.05).Coagulation time of thrombin was shorter in ARCO stage IV than in ARCO stage III(P<0.05).D-dimer levels were higher in ARCO stages IV than in ARCO stages II and III(P<0.05).(3)The uric acid,activated partial thromboplastin time,D-dimer,and platelet count in the elderly group showed statistically significant differences(P<0.05).The uric acid level in ARCO stage IV was higher than that in ARCO stage II and III patients in the elderly group(P<0.05),while the activated prothrombin time in ARCO stage II patients was shorter than that in ARCO stage III patients in the elderly group(P<0.05).The D-dimer level in ARCO stage III and IV patients was higher than that in ARCO stage II patients in the elderly group(P<0.05).The platelet count in ARCO stage IV was lower than that in ARCO stage III patients in the elderly group(P<0.05).(4)Multiple logistic regression analysis showed that total cholesterol and platelet count may be protective factors for course of nontraumatic osteonecrosis of the femoral head,while D-dimer,uric acid,overweight,and young and middle age may be risk factors for course of nontraumatic osteonecrosis of the femoral head.(5)It is indicated that total cholesterol,high-density lipoprotein,uric acid,prothrombin time,prothrombin time International Normalized Ratio,and D-dimer are statistically significant among patients with different ARCO stages.Total cholesterol and platelet count may be protective factors for the course of nontraumatic osteonecrosis of the femoral head,while D-dimer,uric acid,overweight,and middle-aged and young age groups may be hazard factors for the course of nontraumatic osteonecrosis of the femoral head.

Objective To discuss the entries of prognostic factors affecting osteonecrosis of the femoral head(ONFH);To determine optimized and uniform prognostic influences.Methods Through literature pre-search and clinical research,the questionnaire was designed.Experts were selected based on the Delphi method and the questionnaire was distributed to the experts online,and after the questionnaire was recovered,Excel 2016 and SPSS 26.0 software were applied to process the data.The positive coefficients of experts,the degree of authority of experts,the degree of coordination of experts'opinions,the degree of concentration of experts'opinions,and the weight coefficients of the entries were calculated for the evaluation of the importance.Results Totally 116 articles were included.A list of prognostic factors indicators based on original literature was extracted.The first and second rounds of consultation had 30 and 40 experts respectively,and the collected questionnaires were all valid.Finally,10 major prognostic factors affecting ONFH were identified,including whether strictly on crutches,whether in pain(duration of pain),hip mobility,time to confirmation of osteonecrosis,ARCO staging,JIC staging,whether the anterolateral column is preserved,necrotic area,CT supracondylar subchondral fracture zone,and oral administration of traditional Chinese medicine.Conclusion This article summarizes the relevant factors that affect the progression of ONFH,which can further enhance clinical physicians'understanding of the prognosis of ONFH,and can delay the progression of ONFH by effectively intervening in important factors.

BACKGROUND: Cholecystectomy is a standard surgery for patients suffering from gallbladder diseases, while the causal effects of cholecystectomy on colorectal cancer (CRC) and other complications are still unknown. METHODS: We obtained genetic variants associated with cholecystectomy at a genome-wide significant level ( P value <5 × 10 -8 ) as instrumental variables (IVs) and performed Mendelian randomization (MR) to identify the complications of cholecystectomy. Furthermore, the cholelithiasis was also treated as the exposure to compare its causal effects to those of cholecystectomy, and multivariable MR analysis was carried out to judge whether the effect of cholecystectomy was independent of cholelithiasis. The study was reported based on Strengthening the Reporting of Observational Studies in Epidemiology Using Mendelian Randomization guidelines. RESULTS: The selected IVs explained 1.76% variance of cholecystectomy. Our MR analysis suggested that cholecystectomy cannot elevate the risk of CRC (odds ratio [OR] =1.543, 95% confidence interval [CI]: 0.607-3.924). Also, it was not significant in either colon or rectum cancer. Intriguingly, cholecystectomy might decrease the risk of Crohn's disease (OR = 0.078, 95% CI: 0.016-0.368) and coronary heart disease (OR = 0.352, 95% CI: 0.164-0.756). However, it might increase the risk of irritable bowel syndrome (IBS) (OR = 7.573, 95% CI: 1.096-52.318). Cholelithiasis could increase the risk of CRC in the largest population (OR = 1.041, 95% CI: 1.010-1.073). The multivariable MR analysis suggested that genetic liability to cholelithiasis could increase the risk of CRC in the largest population (OR = 1.061, 95% CI: 1.002-1.125) after adjustment of cholecystectomy. CONCLUSIONS The study indicated that cholecystectomy might not increase the risk of CRC, but such a conclusion needs further proving by clinical equivalence. Additionally, it might increase the risk of IBS, which should be paid attention to in clinical practice.
Humans ; Mendelian Randomization Analysis ; Irritable Bowel Syndrome ; Colorectal Neoplasms/genetics* ; Cholelithiasis/complications* ; Cholecystectomy/adverse effects* ; Genome-Wide Association Study ; Polymorphism, Single Nucleotide

Currently, radiotherapy has been found to induce lymphopenia in multiple solid tumors, which has been proven to be associated with poor prognosis. Radiation-induced lymphopenia (RIL) is associated with age, baseline lymphocyte count, tumor size and location and radiotherapy regimens (radiation fractionation, field size and technique), etc. In addition, several drugs and cytokines may help restore lymphocytes. Exploration of effective strategies to prevent or treat RIL may be an important future direction to improve prognosis of cancer patients.

The importance of structural variants(SVs)for human phenotypes and diseases is now recognized.Although a variety of SV detection platforms and strategies that vary in sensitivity and specificity have been developed,few benchmarking procedures are available to confidently assess their performances in biological and clinical research.To facilitate the validation and application of these SV detection approaches,we established an Asian reference material by characterizing the genome of an Epstein-Barr virus(EBV)-immortalized B lymphocyte line along with identified benchmark regions and high-confidence SV calls.We established a high-confidence SV callset with 8938 SVs by integrating four alignment-based SV callers,including 109x Pacific Biosciences(PacBio)continuous long reads(CLRs),22 x PacBio circular consensus sequencing(CCS)reads,104x Oxford Nanopore Technologies(ONT)long reads,and 114×Bionano optical mapping plat-form,and one de novo assembly-based SV caller using CCS reads.A total of 544 randomly selected SVs were validated by PCR amplification and Sanger sequencing,demonstrating the robustness of our SV calls.Combining trio-binning-based haplotype assemblies,we established an SV benchmark for identifying false negatives and false positives by constructing the continuous high-confidence regions(CHCRs),which covered 1.46 gigabase pairs(Gb)and 6882 SVs supported by at least one diploid haplotype assembly.Establishing high-confidence SV calls for a benchmark sample that has been characterized by multiple technologies provides a valuable resource for investigating SVs in human biology,disease,and clinical research.

Objective:To compare magnetic resonance imaging (MRI)-based and computed tomography (CT)-based target volume delineation and dose coverage in partial breast irradiation (PBI) for patients with breast cancer, aiming to explore the application value of MRI localization in PBI after breast-conserving surgery.Methods:Twenty-nine patients with early breast cancer underwent simulating CT and MRI scans in a supine position. The cavity visualization score (CVS) of tumor bed (TB) was evaluated. The TB, clinical target volume (CTV), planning target volume (PTV) were delineated on CT and MRI images, and then statistically compared. Conformity indices (CI) between CT- and MRI-defined target volumes were calculated. PBI treatment plan of 40 Gy in 10 fractions was designed based on PTV-CT, and the dose coverage for PTV-MRI was evaluated.Results:The CVS on CT and MRI images was 2.97±1.40 vs. 3.10±1.40( P=0.408). The volumes of TB, CTV, PTV on MRI were significantly larger than those on CT, (24.48±16.60) cm 3vs. (38.00±19.77) cm 3, (126.76±56.81) cm 3vs. (168.42±70.54) cm 3, (216.63±81.99) cm 3vs. (279.24±101.55) cm 3, respectively, whereas the increasing percentage of CTV and PTV were significantly smaller than those of TB. The CI between CT-based and MRI-based TB, CTV, PTV were 0.43±0.13, 0.66±0.11, 0.70±0.09( P<0.001), respectively. The median percentage of PTV-MRI receiving 40 Gy dose was 81.9%(62.3% to 92.4%), significantly lower than 95.6%(95.0%~97.5%) of PTV-CT. Conclusions:The CVS between CT and MRI is not significantly different, but the MRI-based TB, CTV, PTV are significantly larger than CT-based values. The PTV-MRI is of underdose if PBI treatment plan is designed for PTV-CT. As a supplement of CT scan, MRI can enhance the accuracy of TB delineation after breast-onserving surgery.

Lymphocyte-led immunity plays an important role in the occurrence and development of tumors. It has been found that radiotherapy can induce lymphopenia in patients with solid tumors, and radiotherapy-induced lymphopenia (RIL) might be caused by the irradiation of circulating blood. The sensitivity to irradiation differs among different subtypes of lymphocytes. RIL can be affected by radiation fractionation, technique and volume. Meanwhile, it has been proven that RIL can significantly reduce the survival of patients with multiple solid tumors. In this article, relevant researches were reviewed, aiming to advance clinical treatment decisions and optimize radiotherapy protocols.

Objective: To analyze the failure patterns of locoregional recurrence (LRR) and investigate the range of radiotherapy in T_1-2N₁ breast cancer patients undergoing modified radical mastectomy. Methods: From September 1997 to April 2015, 2472 women with T_1-2N₁ breast cancer after modified radical mastectomy without neoadjuvant systemic therapy were treated in our hospital. 1898 patients who did not undergo adjuvant radiotherapy were included in this study. The distribution of accumulated LRR was analyzed. The LR and RR rates were estimated by the Kaplan-Meier method, and the prognostic factors were identified in univariate analyses with Log-rank test. Multivariate analysis was performed using Cox logistic regression analysis. Results: With a median follow-up of 71.3 months (range 1.1-194.6), 164 patients had LRR, including supraclavicular/infraclavicular lymph nodes in 106(65%), chest wall in 69(42%), axilla in 39(24%) and internal mammary lymph nodes (IMNs) in 19 patients (12%). In multivariate analysis, age (>45 years vs.≤45 years), tumor location (other quadrants vs. inner quadrant), T stage (T₁ vs. T₂), the number of positive axillary lymph nodes (1 vs. 2-3), hormone receptor status (positive vs. negative) were significant prognostic factors for both LR and RR. Conclusions In patients with T_1-2N₁ breast cancer after modified radical mastectomy, the most common LRR site is supraclavicular/infraclavicular nodal region, followed by chest wall. The axillary or IMN recurrence is rare. The prognostic factors for LR and RR are similar, which indicates that supraclavicular/infraclavicular and chest wall irradiation should be considered for postmastectomy radiotherapy.