1.Efficacy of intelligent wireless endoscopy in transurethral resection of the prostate
Chao FANG ; Zeping ZUO ; Chaozhao LIANG ; Zongyao HAO ; Hongtao YU ; Jinhai ZHU ; Yuesheng WANG
Journal of Modern Urology 2026;31(2):135-139
Objective To analyze the clinical efficacy of intelligent wireless endoscopy in transurethral resection of the prostate, so as to provide evidence for clinical application. Methods A retrospective analysis was conducted on the clinical data of 70 patients with benign prostatic hyperplasia (BPH) who underwent transurethral resection of the prostate at Tongling People's Hospital during Jan. 2023 and Dec. 2024. Based on the type of endoscopes used, patients were divided into a wireless endoscopy group and a traditional endoscopy group, with 35 patients in either group. Differences between the two groups were compared in terms of surgical preparation time, operation time, postoperative hospital stay, catheter indwelling time, intraoperative blood loss, surgical complications, and operating comfort during the procedure. Results All 70 operations were successfully completed without severe urinary incontinence. The wireless laparoscopy group demonstrated significantly shorter surgical preparation time compared to the traditional laparoscopy group [(12.14±2.39)min vs. (14.89±0.80)min, P<0.001].There was no statistically significant difference in the operation time between the two groups [(93.51±34.49)min vs. (101.71±34.87)min, P=0.326]. There were no statistically significant differences between the two groups in postoperative hospital stay, catheter indwelling time, intraoperative blood loss, and surgical complications (P>0.05). The wireless endoscopy group demonstrated significantly higher operating comfort compared to the traditional endoscopy group [(3.94±0.77) vs. (2.57±0.61), P<0.001]. Conclusion The use of intelligent wireless endoscopy for transurethral resection of the prostate is comparable to traditional endoscopy in surgical efficacy and patient safety, but it can shorten preoperative preparation time and improve operator comfort.
2.Surgical versus medical castration following radical prostatectomy in patients with very high-risk prostate cancer
Yifan CHANG ; Chaozhao LIANG ; Zongyao HAO ; Shuiping YIN ; Li ZHANG ; Lingfan XU ; Junyue TAO ; Changhao SONG ; Jun ZHOU
Journal of Modern Urology 2025;30(9):748-754
Objective To compare the efficacy,economic burden,psychological impact,and quality of life between surgical and medical castration following radical prostatectomy(RP)in patients with very high-risk prostate cancer(VHR PCa).Methods Clinical data of 167 patients with VHR PCa who underwent RP in the Department of Urology,the First Affiliated Hospital of Anhui Medical University during Jul.2019 and Mar.2024 were retrospectively collected.Patients were divided into two groups:the surgical castration group(n=44)and medical castration group(n=123).The effects of different castration methods on the biochemical recurrence(BCR)were analyzed with Cox proportional hazards models.The survival curves of BCR-free and progress to castration-resistant prostate cancer(CRPC)were plotted with the Kaplan-Meier method.The differences in functional assessment of cancer therapy-prostate(FACT-P)and hospital anxiety and depression scale(HADS)between the two groups were evaluated with linear regression model.Results The total costs were significantly lower in the surgical castration group than in the medical castration group[(47 422.0±3 998.3)yuan vs.(59 017.2±8 014.1)yuan,P<0.001].One month postoperatively,the surgical castration group had significantly lower prostate-specific antigen(PSA)level[0.028(0.010,0.159)ng/mL vs.0.100(0.029,0.895)ng/mL,P=0.002].However,no significant differences were observed in the PSA level between the two groups at 3,6,and 12 months postoperatively,or in PSA nadir and time to nadir(P>0.05).Cox regression analysis suggested a potentially higher risk of BCR in the medical castration group(HR=2.23),but the difference was not statistically significant(P=0.112).The 1-and 3-year BCR-free survival rates were higher in the surgical castration group(90.9%vs.85.4%;86.4%vs.70.7%,respectively),whereas 1-and 3-year progression-free survival rates were comparable between the two groups(97.7%vs.97.6%;95.5%vs.91.9%),with no significant differences(P>0.05).No significant differences were found in FACT-P[(57.3±10.2)vs.(57.3±7.6)]or HADS[(12.6±5.1)vs.(11.3±4.8)]scores between the two groups(P>0.05).Conclusion In VHR PCa patients,surgical castration performed following RP is not inferior to drug castration in terms of PSA control,and potential delay of BCR.It had a lower cost and does not significantly increase the psychological burden.As an underutilized strategy,surgical castration can become an optional option for individualized treatment.
3.Surgical versus medical castration following radical prostatectomy in patients with very high-risk prostate cancer
Yifan CHANG ; Chaozhao LIANG ; Zongyao HAO ; Shuiping YIN ; Li ZHANG ; Lingfan XU ; Junyue TAO ; Changhao SONG ; Jun ZHOU
Journal of Modern Urology 2025;30(9):748-754
Objective To compare the efficacy,economic burden,psychological impact,and quality of life between surgical and medical castration following radical prostatectomy(RP)in patients with very high-risk prostate cancer(VHR PCa).Methods Clinical data of 167 patients with VHR PCa who underwent RP in the Department of Urology,the First Affiliated Hospital of Anhui Medical University during Jul.2019 and Mar.2024 were retrospectively collected.Patients were divided into two groups:the surgical castration group(n=44)and medical castration group(n=123).The effects of different castration methods on the biochemical recurrence(BCR)were analyzed with Cox proportional hazards models.The survival curves of BCR-free and progress to castration-resistant prostate cancer(CRPC)were plotted with the Kaplan-Meier method.The differences in functional assessment of cancer therapy-prostate(FACT-P)and hospital anxiety and depression scale(HADS)between the two groups were evaluated with linear regression model.Results The total costs were significantly lower in the surgical castration group than in the medical castration group[(47 422.0±3 998.3)yuan vs.(59 017.2±8 014.1)yuan,P<0.001].One month postoperatively,the surgical castration group had significantly lower prostate-specific antigen(PSA)level[0.028(0.010,0.159)ng/mL vs.0.100(0.029,0.895)ng/mL,P=0.002].However,no significant differences were observed in the PSA level between the two groups at 3,6,and 12 months postoperatively,or in PSA nadir and time to nadir(P>0.05).Cox regression analysis suggested a potentially higher risk of BCR in the medical castration group(HR=2.23),but the difference was not statistically significant(P=0.112).The 1-and 3-year BCR-free survival rates were higher in the surgical castration group(90.9%vs.85.4%;86.4%vs.70.7%,respectively),whereas 1-and 3-year progression-free survival rates were comparable between the two groups(97.7%vs.97.6%;95.5%vs.91.9%),with no significant differences(P>0.05).No significant differences were found in FACT-P[(57.3±10.2)vs.(57.3±7.6)]or HADS[(12.6±5.1)vs.(11.3±4.8)]scores between the two groups(P>0.05).Conclusion In VHR PCa patients,surgical castration performed following RP is not inferior to drug castration in terms of PSA control,and potential delay of BCR.It had a lower cost and does not significantly increase the psychological burden.As an underutilized strategy,surgical castration can become an optional option for individualized treatment.
4.Diagnosis and treatment of gastrointestinal bleeding after kidney transplantation
Handong DING ; Qin WANG ; Guiyi LIAO ; Zongyao HAO
Journal of Peking University(Health Sciences) 2024;56(5):902-907
Objective:To analyze the clinical characteristics of acute and chronic gastrointestinal bleeding in patients with end-stage renal disease(ESRD)after kidney transplantation,to improve the understanding of the causes,diagnosis,treatment and prevention of this complication,and to improve the management of patients with gastrointestinal bleeding after kidney transplantation.Methods:The clini-cal,imaging and pathological data of patients with gastrointestinal bleeding after kidney transplantation in the Department of Urology of The First Affiliated Hospital of Anhui Medical University from August,2015 to December,2020 were collected.The etiology,early clinical manifestations,abnormal laboratory tests and examinations,treatment procedures,late prevention and treatment measures and outcomes of gastro-intestinal bleeding were retrospectively studied,and the relevant literature was summarized and reviewed.Results:A total of 17 patients were included in this study.Nine patients had chronic small amount of bleeding,hemoglobin gradually decreased,melena and fecal occult blood positive in the early stage,and the general condition was good,vital signs were stable,and were cured by drug treatment.Gastroscopy showed small ulcers with active bleeding foci in 2 cases,and the bleeding was stopped by titanium clips,and the prognosis was good.Gastroscopy showed that the anterior wall longitudinal ulcer at the junction of gastric antrum body was not effective in 1 case,and the small branch of right gastroepithelial artery was embolized,and the patient recovered and discharged after 2 weeks.Gastroscopy showed deep pit ulcer at the lesser curvature of gastric antrum in 1 patient,who underwent distal gastroduodenal artery emboliza-tion and had a good prognosis.Gastroscopy showed huge multiple ulcers in the stomach and duodenal bulb in 2 patients,who underwent subtotal gastrectomy and partial duodenectomy,duodenal stump exclu-sion and remnant gastrojejunostomy.One patient recovered and was discharged,and the other patient died of rebleeding on the 12th day after surgery.Two cases of diverticulum underwent surgical resection of diverticulum,and the prognosis was good.Conclusion:The onset of gastrointestinal hemorrhage in kidney transplant patients is insidious,and the condition is acute or slow,which can cause different de-grees of damage to the patient and the transplanted kidney.Active prevention,early diagnosis,timely drug treatment,if the effect is not good,decisive endoscopic titanium clip hemostasis,transvascular in-terventional embolization,and even surgical treatment can minimize the harm of gastrointestinal bleeding.
5.Is There a Two-Way Risk between Decreased Testosterone Levels and the Progression and Prognosis of Chronic Kidney Disease? A Cohort Study Based on the National Health and Nutrition Examination Survey Database
Jiashan PAN ; Zhenming ZHENG ; Xike MAO ; Dekai HU ; Wenbo WANG ; Guiyi LIAO ; Zongyao HAO
The World Journal of Men's Health 2024;42(2):429-440
Purpose:
The causal relationship between the incidence and prognosis of chronic kidney disease (CKD) and serum testosterone levels in patients is not yet fully understood. This study aims to use the National Health and Nutrition Examination Survey (NHANES), a large-scale nationally representative sample, to investigate the relationship between CKD and testosterone.
Materials and Methods:
This study included six NHANES cycles for linear regression analysis, verified by multiple imputation methods. Stratified analysis and subgroup analysis were used to demonstrate the stability of CKD’s effect on testosterone. Furthermore, we used Kaplan-Meier plots and log-rank tests to evaluate differences in survival rates between CKD male patients with low and normal levels of testosterone.
Results:
From a total of 71,163 subjects, the cohort selected 28,663 eligible participants. Results showed that CKD patients had testosterone levels 28.423 ng/mL (24.762, 32.083) lower than non-CKD patients. The results of multiple imputations (β=27.700, 95% confidence interval: 23.427, 31.974) were consistent with those of linear regression analysis, and the numerical match was good. Stratified regression analysis, and subgroup analysis results showed that CKD had a significant impact on testosterone at different dimensions. Kaplan-Meier plots showed significantly reduced survival rates in low testosterone CKD male patients (p<0.0001).
Conclusions
The results of this big data analysis suggest that there may be a two-way risk between low levels of testosterone and CKD. The testosterone levels of CKD patients were significantly lower than those of the non-CKD population, and CKD patients with low testosterone levels had poorer prognoses. These results suggest that correcting testosterone levels in a timely manner can have preventive and therapeutic effects on the progression of CKD.
6.Feasibility and safety of bipolar-plasmakinetic transurethral enucleation and resection of the prostate in day surgery mode.
Zhihui ZOU ; Ligang ZHANG ; Keke CAI ; Yongtao HU ; Shuchen LIU ; Jia CHEN ; Qintao GE ; Xiaohu ZHAO ; Zongyao HAO ; Chaozhao LIANG
Journal of Zhejiang University. Medical sciences 2023;52(2):148-155
OBJECTIVES:
To evaluate the feasibility and safety of bipolar-plasmakinetic transurethral enucleation and resection of the prostate (B-TUERP) in day surgery.
METHODS:
From January 2021 to August 2022, 34 patients with benign prostatic hyperplasia (BPH) underwent B-TUERP in day surgery in the First Affiliated Hospital of Anhui Medical University. Patients completed the screening and anesthesia evaluation before admission and received the standard surgery which implements "anatomical enucleation of the prostate" and "absolute bleeding control" on the same day of admission, and by the same doctor. Bladder irrigation was stopped, catheter was removed and the discharge evaluation was performed on the first day after operation. The baseline data, perioperative conditions, time of recovery, treatment outcomes, hospitalization costs, and postoperative complications were analyzed.
RESULTS:
All operations were successfully conducted. The average age of the patients was (62.2±7.8) years, average prostate volume was (50.2±29.3) mL. The average operation time was (36.5±19.1) min, the average hemoglobin and blood sodium were decreased by (16.2±7.1) g/L and (2.2±2.0) mmol/L, respectively. The average postoperative length of hospital stay, and total length of hospital stay were (17.7±2.2) and (20.8±2.1) h, respectively, and the average hospitalization cost was (13 558±2320) CNY. All patients were discharged on the day after surgery except for one patient who was transferred to a general ward. Three patients received indwelling catheterization after catheter removal. The 3-month follow-up results showed a substantial improvement in the International Prostate Symptom Score, quality of life score and maximum urinary flow rate (all P<0.01). Three patients experienced temporary urinary incontinence, 1 patient experienced urinary tract infection, 4 patients were diagnosed with urethral stricture and 2 patients experienced bladder neck contracture. No complications above Clavien grade Ⅱ occurred.
CONCLUSIONS
The preliminary results showed that B-TUERP ambulatory surgery is a safe, feasible, economical and effective treatment for appropriately selected patients with BPH.
Male
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Humans
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Middle Aged
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Aged
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Prostate/surgery*
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Prostatic Hyperplasia/surgery*
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Ambulatory Surgical Procedures
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Quality of Life
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Feasibility Studies
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Retrospective Studies
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Treatment Outcome
7.Characteristics of the urinary microbiota in UTUC patients
Liang NIE ; Li CHENG ; Chenglin YANG ; Hao ZHANG ; Zhenxing ZHANG ; Houbao HUANG ; Zongyao HAO ; Chaozhao LIANG ; Dong ZHUO
Chinese Journal of Urology 2023;44(9):665-669
Objective:To analyzed the urinary microbiota characteristics of upper tract urothelial carcinoma(UTUC) patients.Methods:Urine samples were collected from 23 patients with UTUC (UTUC group) and 22 patients with benign diseases (control group) admitted to Yijishan Hospital, the First Affiliated Hospital of Wannan Medical College from July 2021 to July 2022. The differences in age [(60.9±5.7) years vs. (61.4±8.8) years], sex (male/female: 15/8 vs. 9/13), and body mass index [(22.9±1.8) kg/m 2 vs. (23.4±1.7) kg/m 2] between the UTUC group and the control group were not statistically significant ( P>0.05). The V4 region of the 16S rRNA of urinary microorganisms was sequenced using the Illumina NovaSeq6000, and the results were processed using QLLME2. Differences in α-diversity between groups were analyzed by using the Shannon, Simpson, and Chao1 indices. Differences in β-diversity between groups were analyzed by using unweighted principal coordinates analysis (PCoA). Linear discriminant analysis Effect Size(LEfSe)was used to identify the bacterial taxa with different abundances between groups. Significant differences were defined as LDA>2. Results:The Chao1 index (703.12±265.54 vs. 506.20±214.02) and Shannon index (5.61±1.85 vs. 5.07±1.34) were significantly higher in the UTUC group compared to that in the control group ( P<0.05). The α-diversity of urinary microbes was elevated in the UTUC group compared to that in the control group but the difference in β-diversity was not statistically significant ( P=0.161). The enrichment of Bacteroidaceae, Ruminococcaceae, Acidaminococcaceae, Thermaceae, Erysipelatoclostridiaceae, and Coriobacteriaceae abundance was higher in the urine of UTUC patients(LDA > 2). Further subgrouping analyses of the UTUC patients showed that the differences in Chao1 index (706.44±271.84 vs. 784.09±272.72), Shannon index (6.04±1.30 vs. 5.91±1.67), and Simpson index (0.94±0.08 vs. 0.89±0.22) between the muscle-invasive group and the non-muscle-invasive group were not statistically significant ( P>0.05). The difference in α-diversity between muscle-invasive and non-muscle-invasive group was not statistically significant, but the difference in β-diversity was statistically significant ( P=0.047). The urinary microbial communities of Gammaproteobacteria, Cutibacterium, Rhodococcus and Nocardiaceae were enriched in muscle-invasive group and differed from that in non-muscle-invasive group(LDA>2). Conclusions:This study suggests that the urinary microbial community was more abundant in UTUC patients than in non-UTUC patients and that Bacteroidaceae, Ruminococcaceae, Acidaminococcaceae, Thermaceae, Erysipelatoclostridiaceae, and Coriobacteriaceae were more abundant in the urine of UTUC patients. The urinary microbial community was more abundant in the urine of non-muscle-invasive patients than in the muscle-invasive patients, and Gammaproteobacteria, Cutibacterium, Rhodococcus and Nocardiaceae were more abundant in the urine of non-muscle-invasive patients.
8.A case report of familial renal cell carcinoma
Guangyue LUO ; Chaozhao LIANG ; Ligang ZHANG ; Meng ZHANG ; Li ZHANG ; Haoqiang SHI ; Jun ZHOU ; Zongyao HAO
Chinese Journal of Urology 2022;43(4):294-295
A total of 4 patients with renal cancer were admitted to our hospital from October 2006 to September 2015 in a familial renal cancer family. Among the 4 patients, 1 patient showed unilateral multiple clear cell carcinoma, 1 patient showed bilateral multiple clear cell carcinoma, and 2 patients showed bilateral multiple chromophobe cell carcinoma. No mutation of VHL or FLCN gene was found in all patients by genetic analysis.
9.Characters and emergency treatment of upper urinary tract stone obstruction complicated with urosepsis
Lei ZHAO ; Wei WANG ; Jianzhong WANG ; Song FAN ; Zongyao HAO ; Chaozhao LIANG
Chinese Journal of Urology 2021;42(7):507-512
Objective:To investigate the characters and emergency treatment strategy of upper urinary tract stone obstruction complicated with urosepsis.Methods:Clinical data of 28 cases of urosepsis, caused by upper urinary tract stone obstruction and arranged for emergency admission in our hospital during January 2018 to December 2019, were retrospectively analyzed. There were 6 males and 22 females. The median age was 54(32-93)years old. All patients had fever with the temperature ranged from 38.5 to 41.0 ℃. The median course of disease was 3 (ranging 1-14) days. The systolic blood pressure ranged from 76 to 138 mmHg at admission. Hypotension group was defined as the systolic blood pressure<90 mmHg after admission. Normotensive group was defined as the systolic blood pressure≥90 mmHg. There were 12 cases in hypotension group, including 3 males and 9 females. The median age was 57 (ranging 32-93) years old. The stones located at left side in 7 cases and right side in 5 cases. The stones located at the upper ureter in 5 cases, middle ureter in 2 cases, lower ureter in 4 cases and renal calculi in one case. The median length of the stone was 10 (ranging 6-20) mm. Six cases suffered with diabetes mellitus. One case suffered with neuron system disease. 3 cases have history of recent extracorporeal shock wave lithotripsy(ESWL). There were 16 cases in normotensive group, including 3 males and 13 females with the median age of 53 (ranging 33-76) years old. The stones located at left side in 5 cases, right side in 9 cases and bilateral in 2 cases. The stones located at the upper ureter in 10 cases, middle ureter in 4 cases, lower ureter in 2 cases. The length of the stone was 10 (ranging 8-14) mm. There were 3 cases with neurological diseases and 3 cases with recent ESWL history. There was significant difference between hypotension group and normotensive group in ration of diabetes mellitus ( P=0.024). Blood routine examination, C-reactive protein (CRP), procalcitonin(PCT), blood and urine bacterial culture were performed in both groups. The patients were treated with empiric antibiotics after the evaluation based on the sequential organ failure assessment (SOFA). Patients with hypotension were given blood volume expansion, and vasoactive drugs were added when the blood pressure was still low. After the blood pressure was stable, the collection system decompression was performed. The difference of infection indicators and therapeutic methods between the two groups was compared. Results:There was no significant difference in median WBC [16.34 (2.55-41.65) × 10 9/L vs. 13.97(6.23-26.65) × 10 9/L, P=0.577], median CRP [143.0(74.2-200.0) ng/ml vs.110.0 (22.7-200.0) ng/ml, P=0.771] between hypotension group and normotensive group. The difference of PCT [95.5 (26.5-200.0) ng / ml vs. 57.6 (1.0-200.0) ng / ml, P=0.040] and PLT [65.5(14.0-170.0)×10 9/L vs. 73.0(17.0-412.0)×10 9/L, P=0.030] between hypotension group and normotensive group was statistically significant. The median SOFA scores of hypotension group and normotensive group were significantly different [8.5(3.0-13.0) vs. 5.0(2.0-8.0), P=0.001]. Ureteral stent placement was performed in 23 cases, and nephrostomy was performed in 5 cases. There was no significant difference in surgical drainage between the two groups ( P=0.887). Eight patients in hypotension group were admitted to ICU. There was no significant difference in the duration of antibiotic use between hypotension group and normotensive group [8 (3-12) d vs. 5 (3-7) d, P=0.453]. Sepsis was cured in both groups after decompression, fluid resuscitation and antibiotic treatment. Conclusions:In severe cases of upper urinary tract stone obstruction complicated with urogenic sepsis, septic shock may occur. The condition is urgent, severe and dangerous. Patients with hypotension had higher PCT and SOFA scores, and lower PLT. It is very important to carry out the collection system decompression drainage in time, liquid resuscitation, early effective antibiotic use.
10.Effect of low-intensity extracorporeal shock wave on the treatment of chronic prostatitis in rats
Chen JIN ; Zichen BIAN ; Zhengyao SONG ; Zhiping WANG ; Bin FENG ; Li ZHANG ; Zongyao HAO ; Song FAN ; Cheng YANG ; Yi LIU ; Chaozhao LIANG
Chinese Journal of Urology 2020;41(10):779-783
Objective:To explore the therapeutic effect of low-intensity extracorporeal shock wave (Li-ESW) in model rats with chronic prostatitis and its optimal parameters.Methods:From April to August 2019, 90 healthy male SD rats aged 8 weeks were randomly divided into control group (group C, n=15), model group (group M, n=15) and shock wave treatment group (group T, n=60), which were treated with Li-ESW after being modeled successfully. The rats in group T were supine and treated with focused Li-ESW, and the probe was placed above the anatomical position of the prostate. Treatment scheme was 3 Hz of frequency, 500 pulses, and once a week for 4 weeks. Group T was divided into group T1(0.09 mJ/mm 2), T2(0.20 mJ/mm 2), T3(0.30 mJ/mm 2) and T4(0.40 mJ/mm 2) according to energy flux density, with 15 rats in each group. Before the establishment of the model, the rats in each group were tested with von Frey fiber of 2 g, 4 g and 6 g at the scrotum respectively, and the positive reaction was recorded. There was no significant difference between the three groups ( P>0.05). After one week, the rat model with CP was established by injecting 3% carrageenan into the bilateral lobes of the prostate under anesthesia. And one week after the modeling was completed, the rats in each group underwent von Frey test again to measure pain and evaluate the modeling effects. Group T was then treated once a week for a 4-week period. During the treatment, von Frey test was performed before each treatment to evaluate the treatment effect of the previous week. After the von Frey test for one, two and four weeks of treatment, 5 rats were sacrificed in each group, and the bilateral lobes of the prostate were dissected under aseptic conditions for paraffin inclusion and HE staining. Result:The positive reaction in group M and each group T was significantly more than those in group C ( P<0.001) one week after the modeling was completed, and there was no significant difference between group M and group T. The number of positive reactions in group T2 was lower than that in group M at each time point after treatment ( P<0.05), and it is also less in group T1, T3 and T4 were than that in group M after 3 weeks, 3 and 4 weeks and 2 weeks respectively( P<0.05). In group T2, the number of positive reactions began to decrease after 1 week of treatment, and reached the lowest after 4 weeks, with significant difference in pain measurement results at different time points ( P<0.05). The results of pathological examination showed that there were more inflammatory cells in prostatic stroma and disordered arrangement of epithelial cells in group M than that in group C. The pathological scores of group M, T1, T2, T3 and T4 were 8, 7, 4, 6, 9 after 1 week treatment, 8, 5, 3, 4, 7 points after 2 weeks treatment, and 7, 3, 2, 4, 7 points after 4 weeks treatment, respectively. Conclusions:Low-intensity extracorporeal shock wave treatment had a significant effect on the improvement of symptoms in model rats with chronic prostatitis. Under the scheme of frequency 3 Hz, 500 pulses, once a week for 4 weeks, the optimal parameters is 0.20 mJ/mm 2.

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