Sentinel Lymph Node Biopsy in Breast Cancer Patients With Pathological Complete Response in the Axillary Lymph Node After Neoadjuvant Chemotherapy

PurposeSentinel lymph node biopsy (SLNB) alone following neoadjuvant chemotherapy (NAC) remains controversial in patients with breast cancer who are initially lymph node-positive. The present study aimed to evaluate the impact of SLNB and axillary lymph node dissection (ALND) on breast cancer recurrence and survival in patients who converted from lymph node-positive to pathological node-negative (ypN0) after NAC.MethodsThis single-center retrospective study included 223 patients who converted to axillary lymph node-negative status after NAC and underwent breast and axillary surgery between January 2006 and December 2015. This study compared the overall survival (OS), disease-free survival (DFS), ipsilateral axillary lymph node recurrence rates and incidence of postoperative complications, especially, arm lymphedema and shoulder stiffness between SLNB and ALND.ResultsThis study included 223 patients with axillary pathological complete response (pCR) after NAC and surgery. The SLNB and ALND groups included 94 and 129 patients, respectively. The median follow-up time was 57 (range, 6–155) in the SLNB group and 99 (range 2–159) months in the ALND group. The corresponding 5-year OS and DFS rates were 96.3% and 94.2% (p = 0.392), and 89.2% and 86.4% (p = 0.671), respectively. Four patients (4.3%) in the SLNB group and nine (7.0%) in the ALND group developed locoregional recurrences. Ipsilateral axillary lymph node recurrence and distant metastasis were observed in one (1.1%) and three (2.3%) patients, and in 10 (10.6%) and 11 (8.5%) patients, respectively. Patients in the ALND group were more likely than their SLNB counterparts to experience complications, such as shoulder stiffness (9 [7.0%] vs. 4 [4.3%] patients, p = 0.57). The rate of lymphedema in the ALND group was three times that in the SLNB group (35 [27.1%] vs. 8 [8.5%] patients, p < 0.001).ConclusionAs an alternative to ALND, SLNB has oncological safety in patients with axillary pathological complete response after NAC.     

乳腺癌腋窝淋巴结清扫术后阴性淋巴结数目的临床意义

目的：评价早期乳腺癌行腋窝清扫术后阴性淋巴结数目对术后生存的影响。方法：选取病历资料和随访完整的T1-2N0-1M0早期乳腺癌患者,按照淋巴结转移情况分成2组,每组进一步按照阴性淋巴结数目进行分层。将阴性淋巴结数目纳入Cox回归分析影响术后生存的病理学因素,并且比较不同阴性淋巴结数Et对患者术后生存的影响。结果：Cox回归分析显示影响乳腺癌术后生存的病理学因素包括阴性淋巴结数目和激素受体表达。在T1-2N0组,阴性淋巴结数目分别为≤3枚,4枚～5枚,6枚～9枚,≥10枚时,术后中位生存期分别为（82．6±4．1）月、（101．5±1．3）月、（104．7±1．0）月、（110．5±0．9）月;在T1-2N1组,阴性淋巴结数目分别为≤6枚,7枚-8枚,9枚-10枚,≥11枚时,术后中位生存期分别为（95．4±1．9）月、（101．8±1．1）月、（104．9±1．0）月、（106．5±0．9）月;两组差异具有统计学意义（P〈0．05）。结论：早期乳腺癌行腋窝清扫术后的阴性淋巴结数目反映淋巴结清扫的彻底性,是乳腺癌术后生存的独立影响因素,能够评价乳腺癌术后分期的准确性。     

Comparative Study Between Radioisotope Uptake and Fluorescence Intensity of Indocyanine Green for Sentinel Lymph Node Biopsy in Breast Cancer

Recently, several breast surgeons have reported a new method for sentinel lymph node biopsy (SLNB) by using indocyanine green (ICG) with infrared camera. This study aimed to determine whether the lymph nodes (LNs) with ICG uptake are true SLNs and to assess the reliability of using only ICG for SLNB. Data were prospectively collected between April and September 2021. All palpable LNs were fat-trimmed and ordered from high to low signal of the gamma detector. The degree of radioisotope uptake and brightness of ICG staining of the axillary LNs detected with a fluorescent camera were compared and associated factors were analyzed. Discordance was defined as sentinel LNs (SLNs) showing a single uptake of radioisotope or fluorescence of ICG only, or when the orders of uptake and intensity degree were different between the 2 materials. A total of 79 SLNBs were performed on 78 patients with breast cancer. The breast cancer was classified as cTis-2N0-1. The discordance rate was 14/79 (17.7%) overall and 45/270 (16.7%) of the total retrieved axillary LNs. The first SLNs showed the lowest discordance rate of 6.3%, whereas the second and third SLNs showed higher discordance rates of 27.6% and 60.0%, respectively. There were no associated clinicopathologic factors that affected the discordance between uptake of radioisotope and fluorescence intensity of ICG. The use of ICG alone for SLNB may be insufficient because of the high discordance rates between radioisotopes and ICG uptake. However, the first SLN could be cautiously regarded as a true SLN.     

Groin lymph node detection and sentinel lymph node biopsy in vulvar cancer

ObjectiveTo identify suitable diagnostic tools and evaluate the efficacy of sentinel lymph node (SLN) biopsy for inguinal lymph node metastasis in vulvar cancer.MethodsData from 41 patients with vulvar cancer were evaluated retrospectively, including magnetic resonance imaging (MRI) measurements, SLN biopsy status, groin lymph node metastasis, and prognosis.ResultsSLN biopsy was conducted in 12 patients who had stage I to III disease. Groin lymphadenectomy was omitted in five of the nine patients with negative SLNs. All SLN-negative patients who did not undergo groin lymphadenectomy showed no evidence of disease after treatment. On MRI, the long and short diameters of the inguinal node were significantly longer in metastasis-positive cases, compared with negative cases, in 25 patients whose nodes were evaluated pathologically (long diameter, 12.8 mm vs. 8.8 mm, p=0.025; short diameter, 9.2 mm vs. 6.7 mm, p=0.041). The threshold of >10.0 mm for the long axis gave a sensitivity, specificity, positive predictive value, and negative predictive value of 87.5%, 70.6%, 58.3%, and 92.3%, respectively, using a binary classification test. Decision tree analysis revealed a sensitivity, specificity, and accuracy of 87.5%, 70.6%, and 76.0%, respectively, with the threshold of >10.0 mm for the long axis on MRI. The criteria of >10.0 mm for the long axis on MRI predicted an advanced stage and poorer prognosis using a validation set of 15 cases (p=0.028).ConclusionMinimally invasive surgery after preoperative evaluation on MRI and SLN biopsy is a feasible strategy for patients with vulvar cancer.     

宝石 CT 能谱成像在乳腺浸润性导管癌腋窝转移淋巴结诊断中的初步应用

目的：探讨宝石 CT 能谱成像（gemstone spectral imaging,GSI）在乳腺浸润性导管癌腋窝转移淋巴结诊断中的价值。方法：收集绵阳市中心医院2013年2月～2014年12月期间经病理证实并行 GSI 检查的乳腺浸润性导管癌患者32例,所有患者均行腋窝淋巴结清扫术。GSI 扫描时间为动脉后期（33s）,图像后处理采用 ADW4．6工作站及 GSI-view 软件。根据手术病理结果将纳入研究的淋巴结分为转移组（15枚）和非转移组（62枚）。由软件自动生成 KeV-CT 值（电子千伏值-CT 值）曲线,同时记录每枚淋巴结的碘基值和相应层面主动脉碘基值、不同 KeV下淋巴结 CT 值和相应层面主动脉的 CT 值。计算每枚淋巴结40～70KeV 的斜率值（斜率 K ＝（HU40KeV-HU70KeV ）／30）、标化碘基值（淋巴结碘基值／主动脉碘基值）、不同 KeV 下的标化 CT 值（淋巴结 CT 值／主动脉 CT 值）。统计分析运用 spss17．0。结果：在40～70KeV 区间内,转移组淋巴结与非转移组淋巴结的 KeV-CT 值曲线斜率差异具有统计学意义（P ＜0．05）。转移组的碘基值、标化碘基值均小于非转移组,差异有统计学意义（P ＜0．05）。不同KeV 下标化 CT 值的差异均无统计学意义。以曲线斜率3．92作为诊断转移淋巴结的阈值时,灵敏度和特异度分别为77．4％、71．4％;以碘基值19．44作为诊断阈值时,灵敏度和特异度分别为73．3％、72．6％;以标化碘基值0．1677作为诊断阈值时,灵敏度和特异度分别为82．3％、80．0％。结论：CT 能谱成像作为一种新的无创性检查方法,对诊断乳腺浸润性导管癌腋窝转移淋巴结有重要价值。     

48例早期乳腺癌仅行前哨淋巴结活检术的疗效观察

目的探讨前哨淋巴结活检术（SLNB）替代腋窝淋巴结清扫术（ALND）在早期乳腺癌中的应用价值。方法回顾性分析我院行SLNB的48例早期乳腺癌患者的临床和病理资料,并与同期73例SLN阴性行ALND患者进行对比,比较两组患者的远期疗效及术后并发症情况。结果中位随访26月（2～40月）,SLNB组有1例患者于术后14月出现同侧腋窝淋巴结复发,ALND组有1例患者于术后33月出现同侧锁骨上淋巴结转移,两组淋巴结转移率分别为2.1%（1/48）和1.4%（1/73）,差异无统计学意义（P=1.000）;至随访结束,两组均未见远处转移及肿瘤所致死亡病例,总生存率均为100%。SLNB组和ALND组术后平均住院时间分别为5天（2~10天）和9天(5~16天)（P=0.004）,手术后6月时,两组患肢感觉异常发生率分别为4.2%（2/48）和71.2%(52/73)（P=0.000）,患肢水肿发生率分别为0和13.7%(10/73) （P=0.003）,差异均具有统计学意义。结论在SLN阴性早期乳腺癌中,仅行SLNB腋窝淋巴结复发率低,SLNB可以与取得ALND相同的疗效;同时,SLNB与ALND相比手术创伤小,术后并发症少。     

胸段食管鳞癌颈淋巴转移诊治进展

食管癌恶性程度高、预后差。淋巴结转移及阳性淋巴结数量是影响患者预后的重要原因之一,尤其颈淋巴结和喉返神经旁淋巴结是一直研究争议的热点。虽然颈胸腹三野淋巴结清扫术较胸腹两野淋巴结清扫术可以延长患者生存时间并减少复发,但是,该种术式在使患者生存获益的同时也带来了术后高并发症。颈淋巴结是否存在转移直接影响着淋巴结清扫范围,虽然可以通过多种方法诊断颈淋巴结有无转移,但是敏感性及特异性低。喉返神经旁淋巴结被认为是食管癌的前哨淋巴结,用于预测颈淋巴结是否存在转移,然而准确率不超过50%。本文将对目前食管癌颈淋巴转移诊治现状进行综述。     

乳腺癌前哨淋巴结定位和活检

目的：难证乳腺癌前哨淋巴结定位和活检技术的可行性和前哨淋巴结的组织状况能否准确预告腋淋巴结的状况。方法：本研究使用专利蓝,对３３例乳腺癌患者进行了术中及术后前哨淋巴结定位和活检术。结果：３０例（９１％）找到前哨淋巴结,前哨淋巴结预告腋淋巴结的准确率为９６．７％,假阴性１例。结论：本研究结果证实,乳腺癌前哨淋巴结定位和活检技术是可行的,前哨淋巴结的组织学特征能够准确反映腑淋巴结的状况。我们相信在将来     

腋窝淋巴结微小转移与肿瘤微血管计数对乳腺癌患者预后的影响

目的:通过对腋窝淋巴结阴性乳腺癌患者的淋巴结进一步分析,研究淋巴结微小转移灶及肿瘤微血管计数(MVD)对预后的影响。方法:选取1993年564例乳腺癌中腋窝淋巴结阴性患者48例(24例死亡,24例生存),分别用HE、EMA和CK19对原淋巴结病理切片进行复染,确定微小转移灶。将肿瘤病理切片用FVIII因子染色,确定微血管数目。结果:48例共882枚淋巴结中发现微小转移灶为9.0%(79/882),死亡组与对照组之间无显著差异(P>0.05);微血管计数两组之间差异有显著性意义(P<0.001),经统计学分析微血管计数对患者预后的判别能力大于淋巴结微小转移灶。结论:本研究中淋巴结微小转移灶未显示出对生存的明显影响,而肿瘤的微血管计数与腋窝淋巴结阴性乳腺癌患者的生存时间呈负相关。     

Postmastectomy Radiation Therapy in Patients With Minimally Involved Lymph Nodes: A Review of the Current Data and Future Directions

Radiation therapy for patients with pN1mi or pN1 disease breast cancer undergoing mastectomy has been debated for a long time. Even in low metastatic burden in sentinel node biopsy, occult non-sentinel axillary nodal involvement can exist. Radiotherapy can sterilize axillary metastatic burden and seems to contribute a very low local recurrence rate in mastectomy patients with minimally involved lymph nodes. However, it should be considered that systemic therapy is evolving and the local recurrence difference between radiotherapy and no radiotherapy is relatively small. Regarding postmastectomy radiotherapy in patients pN1mi or pN1 cancer, published prospective clinical trial results should be considered; however, there are no such relevant results of clinical trials yet. Consideration of postmastectomy radiation therapy in pN1mi or pN1 patients should be based on identifying the high-risk group in terms of recurrence, stage, or tumor biology. When radiotherapy is determined, radiation oncologists should attempt individualized treatment approaches, such as irradiation field, and consider specific settings, such as neoadjuvant therapy. In this review, the role of radiotherapy in mastectomy patients with minimally involved lymph nodes and the relevant considerations are discussed.     

Current technical overviews of sentinel lymph node biopsy for breast cancer

Sentinel lymph node biopsy (SLNB) is based on the hypothesis that the sentinel lymph node (SLN) reflects the lymph-node status and a negative SLN might allow complete axillary lymph node dissection (ALND) to be avoided. Although the survival outcome is still unknown, this technique has already become a standard of care for breast cancer patients. However, it is still important to discuss current techniques and some controversies. This article reviews these issues for a variety of SLNB techniques.     

A critical assessment on the role of sentinel node mapping in endometrial cancer

Endometrial cancer is the most common gynecologic malignancy in the developed countries. Although the high incidence of this occurrence no consensus, about the role of retroperitoneal staging, still exists. Growing evidence support the safety and efficacy of sentinel lymph node mapping. This technique is emerging as a new standard for endometrial cancer staging procedures. In the present paper, we discuss the role of sentinel lymph node mapping in endometrial cancer, highlighting the most controversies features.     

Sentinel node identification rate, but not accuracy, is significantly decreased after pre-operative chemotherapy in axillary node-positive breast cancer patients

Background The aim was to prove the low identification rate of sentinel lymph node biopsy (SNB) and to determine the feasibility of replacing axillary lymph node dissection (AND) in axillary lymph node positive patients after chemotherapy. Methods From October 2001 to July 2005, 875 consecutive patients with primary operable breast cancer underwent SNB and AND. Among them, 238 received pre-operative chemotherapy. We compared the identification rate, false negative rate (FNR), negative predictive value (NPV), and accuracy of SNB in clinically node-positive patients with or without chemotherapy. Results The identification rate was significantly lower in patients received chemotherapy (77.6%) than in those not received it (97.0%) (P < 0.001). In those received the therapy, the FNR was 5.6%, the NPV was 86.8%, and the accuracy was 95.9%. In those not received therapy, the FNR was 7.4% and the accuracy was 92.6% (differences not statistically significant). Conclusion The identification rate in confirmed axillary lymph node-positive patients was significantly lower in patients received pre-operative chemotherapy, but accuracy did not differ significantly between the two groups. Thus, for patients who achieve complete axillary clearance by chemotherapy, SNB could replace AND.     

精准治疗理念下乳腺癌患者腋窝淋巴结的评估与处理

腋窝淋巴结状态是乳腺癌分期、治疗决策以及预后判断的重要依据。精准医疗时代的到来更突显了腋窝淋巴结状态评估的重要性。除查体、超声等常规检查外,乳腺核磁、PET/CT以及近红外荧光、超顺磁性氧化铁、光声造影剂等新方法也可提供指导,其中前哨淋巴结活检是最重要的检查方法。新的临床证据表明前哨淋巴结阴性和前哨淋巴结1~2枚阳性的患者可以免除腋窝淋巴结清扫。炎性反应指标的比值可能是预测淋巴结转移的有用指标。部分高龄患者可以免除腋窝手术并获得良好预后。本文将围绕腋窝淋巴结的评估方法和处理争议进行梳理和总结,以期为精准治疗理念下乳腺癌患者腋窝淋巴结的处理提供新的指导。     

The Prognostic Significance of the Lymph Node Ratio in Axillary Lymph Node Positive Breast Cancer

Purpose

This study evaluated the prognostic impact of the lymph node ratio (LNR; i.e., the ratio of positive to dissected lymph nodes) on recurrence and survival in breast cancer patients with positive axillary lymph nodes (LNs).

Methods

The study cohort was comprised of 330 breast cancer patients with positive axillary nodes who received postoperative radiotherapy between 1987 and 2004. Ten-year Kaplan-Meier locoregional failure, distant metastasis, disease-free survival (DFS) and disease-specific survival (DSS) rates were compared using Kaplan-Meier curves. The prognostic significance of the LNR was evaluated by multivariate analysis.

Results

Median follow-up was 7.5 years. By minimum p-value approach, 0.25 and 0.55 were the cutoff values of LNR at which most significant difference in DFS and DSS was observed. The DFS and DSS rates correlated significantly with tumor size, pN classification, LNR, histologic grade, lymphovascular invasion, the status of estrogen receptor and progesterone receptor. The LNR based classification yielded a statistically larger separation of the DFS curves than pN classification. In multivariate analysis, histologic grade and pN classification were significant prognostic factors for DFS and DSS. However, when the LNR was included as a covariate in the model, the LNR was highly significant (p<0.0001), and pN classification was not statistically significant (p>0.05).

Conclusion

The LNR predicts recurrence and survival more accurately than pN classification in our study. The pN classification and LNR should be considered together in risk estimates for axillary LNs positive breast cancer patients.     

Ipsilateral Malignant Axillary Lymphadenopathy and Contralateral Reactive Lymph Nodes in a COVID-19 Vaccine Recipient With Breast Cancer

Vaccine-related axillary nodal enlargement is a common benign condition that many mRNA vaccine receivers experience. However, a false attribution of axillary swelling to vaccination may result in delay in cancer care and potential disease progression, particularly in breast cancer patients presenting with ipsilateral axillary lymphadenopathy. We report the case of a 41-year-old pre-menopausal female who presented with suspicious axillary nodal enlargement and a right breast lump (triple-negative invasive ductal carcinoma) after recent administration of the second dose of Moderna mRNA coronavirus disease 2019 (COVID-19) vaccine. On imaging, bilateral axillary lymph nodes were detected. The ipsilateral right-sided node was proven to be metastatic, whereas contralateral nodes were related to a recent mRNA COVID-19 vaccination. Right-sided lymph node had intense uptake (maximum standardized uptake value [SUVmax] = 5), while the contralateral reactive nodes were mildly avid (SUVmax = 2.6). On magnetic resonance imaging, the right-sided node revealed asymmetric cortical thickening and marked cortical enhancement as opposed to normal-appearing left-sided nodes.     

Accuracy of Methylene Blue Test as Single Technique for Sentinel Lymph Node Biopsy in Early Stages Breast Cancer

Aim: Sentinel Lymph Node Biopsy (SLNB) establishes as a gold standard for diagnostic lymph node involvement in early breast cancer. Most of the developed country does not have radiotracer and nuclear medicine facilities. Unless in Indonesia there is Methylene Blue as an alternative agent for SLNB. This study measure accuracy of sentinel lymph node biopsy as a single technique using the Methylene Blue test. Methods: This cross-sectional study enrolled 60 female patients with breast cancer stage I-II. We performed SNB using 2-5 cc of 1% Methylene-blue dye (MBD) injected to periareolar tissue and proceeded with axillary lymph nodes dissection (ALND). The histopathology results of sentinel nodes (SNs) and axillary lymph nodes (ALNs) analyze for diagnostic value assessments. Results: The identification rate of SN was 97.62 %, and the median number of identified SNs was 4 (2-7). Sentinel node metastasis was found in (19/60) % cases and % of them were macrometastases. The sensitivity and specificity of MBD were 91.67% and 96.67% respectively. The negative predictive value (NPV) of SNs to predict axillary metastasis was 96.67% (95% CI, 81-99%). Conclusion: Injection of 1% MBD as a single technique in breast cancer SNB has a favorable identification rate and predictive value.     

Evaluation of Complications of Short-term and Long-term Drainage Following Mastectomy with Removal of Axillary Lymph Nodes: A Randomized Clinical Trial

Background: Breast cancer is one of the most common cancers in Iran and round the globe. Seroma formation is the most common primary complication after mastectomy (partial/radical). Nowadays, drainage is used as a routine method to reduce seroma formation after mastectomy, although there is no consensus about the appropriate time to perform drainage after this surgery. This study evaluated the effects of short-term and long-term drainage after mastectomy along with removal of axillary lymph nodes. Methods: This randomized clinical trial was performed on 88 women who underwent mastectomy with ALND in hospitals in Yazd (were randomly divided into two groups). Suction drains were inserted for all patients at completion of surgery. The data collection tool was a researcher-made form based on variables. In the first group, the drain was removed 24 hours after surgery and the patients were discharged, but the second group was discharged with the drain in place after 24 hours and the drain was removed 5 days after surgery. Data were analyzed with SPSS18 using T-Test, Chi square, and Mann-Whitney U test. Results: The results showed that 28 (31.8%) participants had formed seroma, of whom 22 (50%) were in the 1-day drainage group and 6 (13.6%) were in the 5-day drainage group. There was a statistically significant correlation among seroma frequency, mean aspiration volume, mean number of aspirations, mean seroma volume in sonography one week after surgery, and mean seroma volume in sonography between the two groups three weeks after surgery (P<0.05). Conclusion: Based on the results, it can be concluded that long-term drainage reduces the risk of seroma formation after mastectomy with removal of axillary lymph nodes compared to short-term drainage. Complementary study be performed by considering other underlying factors such as comorbidities to obtain the best drain removal time in breast cancer patients.     

Indocyanine Green Fluorescence Versus Blue Dye or Radioisotope Regarding Detection Rate of Sentinel Lymph Node Biopsy and Nodes Removed in Breast Cancer: A Systematic Review and Meta-Analysis

Background: Either blue dye (BD) or radioisotope (RI) is mainly used for sentinel lymph node biopsy (SLNB) in breast cancer patients. Unlike the BD, RI has lower false-negative rate of SLNB. However, its lymphoscintigraphy, difficulty in preoperative injection, and undetected sentinel lymph nodes in some cases cause surgeons to rely only on BD. Currently, indocyanine green (ICG) fluorescence method (ICG-SLNB) is increasingly used as an alternative to the conventional mapping methods in many centers. This systematic review compared ICG with the conventional method of BD or RI in terms of detection rate of SLNB and the number of sentinel lymph nodes (SLNs) removed in. Methods:  We searched all relevant studies published between January 2000 and October 2019. All data on for evaluation of SLN detection rate, number of SLNs removed per patient, and tumor positive rate of SLNB were extracted. Results: A total of 30 studies, including 4,216 SLN procedures were retrieved. There was a statistically significant difference between ICG and BD method in terms of SLN detection rate (OR, 6.73; 95% CI, 4.20-10.78). However, there was no significant difference between ICG and RI in this regard (OR, 0.90; 95% CI, 0.40-2.03). The number of SLNs removed per patient were 2.35 (1.46-5.4), 1.92 (1.0-3.64), and 1.72 (1.35-2.08) for ICG, BD, and RI, respectively. Only in 8 studies, the tumor positive rates in SLNB could be analyzed (ICG, 8.5-20.7%; BD, 12.7-21.4%; RI, 11.3-16%). Conclusion: ICG-SLNB could be an additional or an alternative method for axillary node mapping in breast cancer.     

腋窝淋巴结阴性乳腺癌淋巴结微小转移及c-erbB-2扩增的研究

探讨腋窝淋巴结阴性（ＡＮＮ）乳腺癌淋巴结微小转移（ＬＮＭ）以及原发灶ｃ－ｅｂＢ－２扩增的临床意义。方法：应用免疫组化方法对５８例ＡＮＮ乳腺癌ＬＮＭ进行检测，利用差异ＰＣＲ技术测定对应原发灶ｃ－ｅｒｂＢ－２扩增。结果：２５．８％病例存在ＬＮＭ，３１．０％伴有ｃ－ｅｒｂＢ－２扩增；在低分化乳腺癌组中，ＬＭＮ阳性率明显高于高分化组；肿瘤直径〉２．０ｃｍ者的ＬＮＭＭ检出率显著高于直径≤２．０ｃｍ患者；在Ｌ