Objective To test the potency of hepatitis B vaccine in China. Methods Two inbred strains(DBA/1 and BALB/c) and two NIH closes-colonies of mice were typed in the H-2 region by microcy-totoxicity method and PCR. Groups of mice of the tested strains were immunized with the same hepatitis B vaccine, the titre of anti-HBsAg antibody was analyzed by microplate, and the ED50 was then estimated by Karder method for each strain. Results Significant differences were found between potency estimates de-rived from assays using different strains of mice. Conclusion It is likely that the variation of immune re-sponse to hepatitis B vaccine in mice is correlative with the H-2 haplotype. In some special case, the bet-erozygosity in H-2 region found in NIH stock could influence the accuracy in such testing even a reference preparation of hepatitis B vaccine was used. Base on our experiment, to select an appropriate NIH stocks with the H-2q haplotype for potency testing of hepatitis B vaccine in China.

Purpose: This study aimed to investigate the factors associated with chemoresistance to neoadjuvant chemotherapy (NACT) followed by radical hysterectomy (RH) and construct a nomogram to predict the chemoresistance in patients with locally advanced cervical squamous carcinoma (LACSC). Materials and Methods: This retrospective study included 516 patients with International Federation of Gynecology and Obstetrics (2003) stage IB2 and IIA2 cervical cancer treated with NACT and RH between 2007 and 2017. Clinicopathologic data were collected, and patients were assigned to training (n=381) and validation (n=135) sets. Univariate and multivariate analyses were performed to analyze factors associated with chemoresistance to NACT. A nomogram was built using the multivariate logistic regression analysis results. We evaluated the discriminative ability and accuracy of the model using a concordance index and a calibration curve. The predictive probability of chemoresistance to NACT was defined as > 34%. Results: Multivariate analysis confirmed menopausal status, clinical tumor diameter, serum squamous cell carcinoma antigen level, and parametrial invasion on magnetic resonance imaging before treatment as independent prognostic factors associated with chemoresistance to NACT. The concordance indices of the nomogram for training and validation sets were 0.861 (95% confidence interval [CI], 0.822 to 0.900) and 0.807 (95% CI, 0.807 to 0.888), respectively. Calibration plots revealed a good fit between the modelpredicted probabilities and actual probabilities (Hosmer-Lemeshow test, p=0.597). Furthermore, grouping based on the nomogram was associated with progression-free survival. Conclusion We developed a nomogram for predicting chemoresistance in LACSC patients treated with RH. This nomogram can help physicians make clinical decisions regarding primary management and postoperative follow-up of the patients.

Objective To analyze the prognosis ofⅠb2 andⅡa2 cervical squamous cancer without high risk factors treated with neo-adjuvant chemotherapy(NACT)and radical hysterectomy. Methods This retrospective study included patients with International Federation of Gynecology and Obstetrics (FIGO)stageⅠb2 andⅡa2 cervical squamous cancer without high risk factors who underwent platinum-based NACT followed by radical surgery from January 2008 to January 2015.The responses of NACT were observed and compared in their effect on postoperative pathologic risk factors. Kaplan-Meier method and Cox regression analysis were performed to analyze survival status. Results This study was recruited 282 patients with the average age of(44.4±6.7)years old.After NACT,42 patients achieved complete response [CR,14.9%(42/282)],while 138 patients achieved partial response[PR,48.9%(138/282)]and 102 stable disease [SD, 36.2%(102/282)]. The rate of pathologic diameter ≥4 cm, deep stromal invasion(DSI) positive and lymph-vascular space invasion(LVSI)positive rate decreased significantly in CR and PR group compared with SD group(P<0.05). The number of postoperative risk factors in CR, PR and SD groups varied significantly(χ 2=64.869, P=0.000). Besides,the rate of multiple intermediate risk factors was respectively 0 vs 13.8% vs 45.1%(χ2=7.107, P=0.008). The disease relapsed in 23 patients, and 12 died. On the whole series, 5-year overall survival rate was 91.7%, and 5-year recurrence-free survival rate was 88.9%. The rate of recurrence(P=0.002)and mortality(P=0.036)were higher in LVSI positive patients compared with LVSI negative. And the rate of recurrence was higher in patients with multiple intermediate risk factors,compared with no or one intermediate risk factors(P=0.002).Univariate analysis revealed that LVSI positive and multiple intermediate risk factors were the factors predicted recurrence and mortality(P<0.05), and no significance in age, stage, tumor grade, tumor diameter before or after NACT, response to NACT,or DSI positive factors(all P>0.05).The multivariate analysis showed that,the factor of primary tumor diameter≥6 cm(P=0.022)and multiple intermediate risk factors(P=0.001)were independent prognostic variables for recurrent-free survival.Besides,multiple intermediate risk factors was independent prognostic variable for overall survival(P=0.034). After surgery, 107 patients did not receive adjuvant therapy,while 175 patients received adjuvant therapy with 26 radiotherapy,46 chemotherapy and 103 concurrent radiochemotherapy.On survival analysis of postoperative adjuvant treatment,5-year recurrence-free survival rate of radiotherapy group was significantly lower in patients with the factor of SD response to NACT(P=0.011)and multiple intermediate risk factors(P=0.008), while overall no significance in overall survival rate(P>0.05).Conclusions NACT may be play beneficial role in relieving the status of intermediate risk factors for stage Ⅰb2 andⅡa2 cervical squamous cancer without high risk factors. The status of multiple intermediate risk factors is independent prognostic factors for recurrence and mortality. For patients with multiple intermediate risk factors, postoperative adjuvant chemotherapy or concurrent radiochemotherapy might be the better choice to prevent relapse.

Objective:To investigate the rationality of nerve-plane sparing radical hysterectomy (NPSRH) for cervical cancer by observing the anatomical and histological characteristics of pelvic autonomic plane based on fresh cadaver.Methods:From October 2015 to September 2020, 14 fresh female cadavers were anatomically and histologically studied in the Laboratory of Anatomy and Embryology Department, Peking Union Medical College, Chinese Academy of Medical Sciences. The median age of the specimens was 79 years (range: 67 to 92 years). Twenty-eight hemi-pelvic specimens were obtained from 14 fresh female cadavers. NPSRH procedures were simulated in 8 hemi-pelvic cavities to prove its feasibility. Detailed dissection was conducted to recognize nerve plane and to observe the distribution of pelvic nerves in 10 hemipelvis. In the other 10 hemipelvis, whole parametrium tissue was taken from the crossing of ureter and the uterine artery to the ureterovesical entrance and be embedded, then continuous section was performed, and was stained by hematoxylin-eosin staining (HE) to observe the relationship of nerves and vessels. Immunohistochemical staining of S100, tyrosine dehydrogenase (TH), and vasoactive intestinal peptide (VIP) were performed to count and distinguish sympathetic and parasympathetic nerves, respectively.Results:(1) The pelvic autonomic nerve-plane was completely preserved in 7 of 8 hemipelvis by simulating NPSRH. (2) After detailed dissection in 10 hemipelvis, it was found that hypogastric nerve, pelvic splanchnic nerve, and their confluence of inferior hypogastric plexus were distributed in a planar statelocating in the ureteral mesentery and its caudal extension. This nerve plane showed a cross relationship with deep uterine vein and its branches. The bladder branches and vesical venous plexus were closely related to the inferior hypogastric plexus. The middle vesical vein and inferior vesical vein were intact in 7 of 10 hemipelvis, and either vesical vein was missing in 3 of them. It was observed that the vesical venous plexus communicated with the deep uterine vein trunk on the medial side of the nerve plane in 6 hemipelvis, while flowed into the deep uterine vein on the lateral side of the nerve plane in 2 hemipelvis, and in the other 2 hemipelvis it directly flowed into the internal iliac vein. (3) It was revealed that autonomic nerves were continuously distributed beneath the ureteral with sagittal plane by HE staining. The average nerve content below the ureteral width was 70.9% of the total in nerve plane by S100 staining. TH and VIP staining showed that the average number of sympathetic fibers was 13.5 and parasympathetic fibers was 8.2, reminding sympathetic predominated.Conclusion:Pelvic autonomic nerves are mainly distributed within the mesangial plane below the ureter, which provides an anatomic justification for NPSRH.

Objective:To investigate the efficacy and safety of laparoscopic radical hysterectomy for early cervical adenocarcinoma.Methods:A retrospective observational study was performed by reviewing medical records of patients with staging Ⅰb1-Ⅱa2 International Federation of Gynecology and Obstetrics (FIGO, 2009) cervical adenocarcinoma who underwent laparoscopic or abdominal radical hysterectomy from 2007 to 2017 in the Cancer Hospital, Peking Union Medical College, Chinese Academy of Medical Sciences. The difference among clinicopathologic characteristics, surgery-related parameters and complications, and prognosis were analyzed between the laparoscopic group and abdominal group.Results:Two hundreds and ninety-three patients were included with 88 cases in laparoscopic group and 205 cases in abdominal group. （1） There was no significant difference in clinicopathologic characteristics between the two groups （all P>0.05）, including age, body mass index, menopause status, history of abdominal surgery, clinical stage, tumor diameter, neoadjuvant chemotherapy, differentiation, lymph-vascular space invasion, positive of surgical margin, parametrial invasion, and lymph node metastasis. But the abdominal group showed a higher proportion of deep stromal invasion (38.5% vs 25.0%, P<0.05). No significant difference was observed between two groups with number of lymph nodes resected, urinary catheter retention, short-term surgical complications (including ureteral injury, ileus, infection, hydronephrosis and poor wound healing), and long-term complications (including voiding dysfunction, defecation dysfunction and lower limb edema； all P>0.05）. （2） The laparoscopic group was significantly associated with a longer operation time [(260±51) minutes vs (244±53) minutes, P<0.05], but less bleeding (100 ml vs 300 ml, P<0.01), shorter hospital stay [(13±5) days vs (16±8) days, P<0.01] and lower incidence of lymphedema (12.5% vs 27.8%, P<0.01). （3） The 5-year progression-free survival (PFS; 85.7% vs 86.4%, P=0.971) and 5-year overall survival (OS; 91.4% vs 93.0%, P=0.657) of laparoscopic group were comparable to that of abdominal group. （4） Multivariate analysis demonstrated that lymph node metastasis ( HR=2.44, 95% CI: 1.16-5.15, P=0.019) was independent poor prognostic factors related to PFS, while adenosquamous carcinoma ( HR=2.54, 95% CI: 1.02-6.35, P=0.046), lymph-vascular space invasion ( HR=3.86, 95% CI: 1.60-9.33, P=0.003) and lymph node metastasis ( HR=5.92, 95% CI: 2.45-14.34, P<0.01) were independent poor prognostic factors related to OS. The laparoscopy surgery was not an independent poor prognostic factor ( P=0.396). Conclusion:The laparoscopic radical hysterectomy for early cervical adenocarcinoma has comparable prognosis to abdominal radical hysterectomy with a higher surgery quality.