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Chiu, W.K.;  Kwok, S.T.;  Wang, Y.;  Luk, H.M.;  Chan, A.H.Y.;  Tse, K.Y. Sentinel Lymph Node Biopsy Techniques in Endometrial Cancer. Encyclopedia. Available online: https://encyclopedia.pub/entry/35854 (accessed on 19 May 2024).
Chiu WK,  Kwok ST,  Wang Y,  Luk HM,  Chan AHY,  Tse KY. Sentinel Lymph Node Biopsy Techniques in Endometrial Cancer. Encyclopedia. Available at: https://encyclopedia.pub/entry/35854. Accessed May 19, 2024.
Chiu, Wan Kam, Shuk Tak Kwok, Yaokai Wang, Hiu Mei Luk, Aaron Hei Yin Chan, Ka Yu Tse. "Sentinel Lymph Node Biopsy Techniques in Endometrial Cancer" Encyclopedia, https://encyclopedia.pub/entry/35854 (accessed May 19, 2024).
Chiu, W.K.,  Kwok, S.T.,  Wang, Y.,  Luk, H.M.,  Chan, A.H.Y., & Tse, K.Y. (2022, November 22). Sentinel Lymph Node Biopsy Techniques in Endometrial Cancer. In Encyclopedia. https://encyclopedia.pub/entry/35854
Chiu, Wan Kam, et al. "Sentinel Lymph Node Biopsy Techniques in Endometrial Cancer." Encyclopedia. Web. 22 November, 2022.
Sentinel Lymph Node Biopsy Techniques in Endometrial Cancer
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This entry is adapted from the peer-reviewed paper 10.3390/jcm11216462

Lymph node status is important in predicting the prognosis and guiding adjuvant treatment in endometrial cancer. However, previous studies showed that systematic lymphadenectomy conferred no therapeutic values in clinically early-stage endometrial cancer but might lead to substantial morbidity and impact on the quality of life of the patients. The sentinel lymph node is the first lymph node that tumor cells drain to, and sentinel lymph node biopsy has emerged as an acceptable alternative to full lymphadenectomy in both low-risk and high-risk endometrial cancer.

endometrial cancer sentinel lymph node biopsy lymphadenectomy micro-metastasis isolated tumor cells ultra-staging

1. Introduction

Endometrial cancer (EC) is the most common gynaecological cancer in developed countries, and the incidence has been rising with aging and increased obesity of the population. Surgery is the mainstay treatment for EC. Standard surgery includes total hysterectomy and bilateral salpingo-oophorectomy, with or without pelvic/para-aortic lymphadenectomy (LND) [1][2]. Lymph node (LN) assessment is important because LN metastasis is one of the most important prognostic factors for EC [3][4]. The 5-year overall survival (OS) for pelvic LN metastasis and para-aortic LN metastasis was found to be 57% and 49%, respectively [5]. The knowledge of LN status can also facilitate the use of adjuvant chemotherapy and radiotherapy to reduce the risk of distant and local recurrence [6][7]. However, the therapeutic value of LND has not been established. Two large randomized controlled trials (RCTs) in 2008 and 2009 showed that pelvic LND offered no therapeutic benefits compared with no LND in clinically early-stage EC [8][9]. A more recent multicenter retrospective study also demonstrated that LND had no survival benefit in an intermediate-risk group [10]. The Endometrial Cancer Lymphadenectomy (ECLAT) Trial is evaluating the survival effects of comprehensive LND in the absence of bulky nodes in patients with EC stages IB to II (all histological subtypes) and stage IA endometrioid International Federation of Gynecology and Obstetrics (FIGO) grade 3, serous, clear cell, or carcinosarcomas, and the results are expected in 2023 [11].
Sentinel lymph node (SLN) is the first LN reached by the metastasizing cells from the primary tumor before draining to the distal LNs [12]. In theory, if the SLN is negative, the remaining LNs in that lymphatic chain should also be negative. SLN biopsy (SLNB) is a minimally invasive technique used to identify the SLN and occult LN metastases. Nowadays, it replaces systematic LND in selected EC patients [1][2]. However, there are still myths about its usefulness in low-risk patients, and its safety in high-risk patients.

2. Lymphatic Drainage of Endometrial Cancer

The lymphatic drainage of the endometrium is quite complex. The lymphatic drainage of the lower uterine segment is the same as that of the cervix, which drains through the parametria to the iliac and obturator nodes at the pelvic sidewall, common iliac LNs, para-aortic LNs and beyond (Figure 1). Alternative drainage near the uterine fundus develops along the gonadal vessels directly to the para-aortic nodes [13][14]. This implies that if the SLN is in the para-aortic region, it might be missed by the usual SLNB techniques that target the pelvic nodes (see Section 3). However, a prospective study of 742 patients reported that only 3% patients had isolated positive para-aortic nodes when pelvic nodes were negative [15].
Figure 1. Lymphatic drainage of endometrial cancer. (LN, lymph nodes).

3. Techniques of Sentinel Lymph Node Biopsy in Endometrial Cancer

Many factors such as age, depth of myometrial invasion and risk of lymphatic infiltration have been attributed to the successful rate of SLN mapping [16]. The performance of SLN biopsy is also affected by surgical expertise and the algorithm in SLN mapping failure [17].

3.1. Injection Sites

Different injection methods have been reported in the literature. Cervical injection is the most common approach. It had been shown that the cervical injection had a higher detection rate of pelvic SLN compared with the hysteroscopic injection at the endometrial tumor [18][19], while hysteroscopic injection had a slightly higher detection rate of para-aortic SLN especially isolated para-aortic LN compared to cervical injection [20]. This method is expensive because of the need for specialized equipment. Some reported that injection at dual sites (cervix and uterine fundal injection) increased the detection of SLN [21], and hysteroscopic injection and laparoscopic uterine fundal serosa injection also improved the para-aortic SLN detection [20][21]. Maramai et al. reported that in the case of failed bilateral mapping of SLN, cervical re-injection of ICG could significantly improve SLN detection rates from 73.3% to 94.5%, thus reducing the number of side-specific required lymphadenectomies [22].
To further improve SLN detection rate, some authors have combined preoperative lymphoscintigraphy with the injection of tracer. For example, Elisei et al. performed single-photon emission computerized tomography (SPECT) about three hours after Technetium (Tc)-99m-albumin cervical injection, and found that SPETCT could provide important anatomic information and enhance the intraoperative detection rate of SLNs [23]. At the same time, re-injection is another strategy that might improve the mapping rate of SLN in EC [22][24]. Cervical or hysteroscopic injections requires a long learning curve, and some studies suggested that an experienced physician was an important factor in improving the detection rate of SLN [24][25].

3.2. Injection Techniques and Tracers

Following general anesthesia, the tracer is injected into the submucosa (approximately 1–2 mm depth) and stroma (approximately 1–2 cm depth) of the cervix at 3 and 9 o’clock [20][22][23][24] (Figure 2a). According to the National Comprehensive Cancer Network (NCCN) guideline, injection at 3, 6, 9 and 12 o’clock of the cervix is another approach [2] (Figure 2b). The dye should be injected slowly at 5–10 sec per quadrant [26]. Retroperitoneal space needs to be opened. Retroperitoneal SLNs are then identified either by laparoscopic or open evaluation.
Figure 2. Injection of tracer at the cervix. Using ICG as example, 0.5–1 mL can be injected each superficially (1–3 mm at submucosa) and deeply (1–2 cm at stroma) at 3 and 9 o’ clock (blue dots) (a), or 0.5 mL each superficially and deeply at 3, 6, 9 and 12 o’clock of the cervix (green dots) (b).
Colored dyes, including isosulfan blue and methylene blue, are affordable and they do not require special equipment. However, they have a low detection rate of SLN compared to other methods [27]. There is also a degree of subjectivity with the visual assessment [28]. Isosulfan blue was also associated a 1% risk of allergic reactions including anaphylaxis [25][26], and methylene had also been found to carry a small risk of paradoxical methemoglobinemia and serotonin syndrome [29], making them less favored nowadays.
Tc-99m is a metastable isomer that has become one of the most commonly used medical radioisotopes in diagnostic procedures since its introduction in the 1960s [30]. It has a half-life of about six hours, which can avoid excessive radio-exposure to the patients and the doctors. Tc-99m is injected at 3 o’clock and 9 o’clock of the cervix, and the signal is then identified intraoperatively by a gamma probe, with or without the SPECT–CT scan. Tc-99m has a better identification rate and sensitivity than methylene blue in many malignant tumors [31]. It can allow preoperative detection of SLN, and facilitate the detection of uncommon sites of nodal metastasis. The risk of allergic reactions is very rare with an estimated rate of 1-10/100,000 [32]. However, it requires special equipment and support from radiology departments. Besides, there is a small risk of radiation exposure to the medical personnel and the patients, thus limiting its widespread use in clinical practice.
Indocyanine green (ICG) is a water-soluble tricarbocyanine dye that penetrates tissues for up to 15 mm. It absorbs light at about 800 nm and emits light at about 830 nm [33]. The usual recommendation is to dilute the ICG to 0.5 mg/mL to 1.25 mg/mL using sterile water; 2–4 mL are to be injected [34]. The light emitted by the ICG is then visualized using a near-infrared fluorescent imaging system. It has good visibility and allows penetration of signal through intact tissue. Because of its safety and effectiveness, it has been widely used in hepatobiliary surgery, cardiac surgery, urology and other fields [35]. A meta-analysis showed that the detection rate of SLN was 77.8% with blue dye, 80.9% with Tc-99m, 86.3% with blue dye and Tc-99m, 92.4% with ICG alone, respectively, and up to 96.7% using ICG and blue dye based on two studies and 100% using ICG and Tc-99m based on one study [36]. The major disadvantage of ICG is the cost due to the requirement of the near-infrared fluorescent imaging system. In addition, ICG contains sodium iodine; there is an estimated 1/42,000 risk of anaphylactic reaction and iodine allergy is a contraindication to ICG [37]. The pooled sensitivity was above 90% regardless the choice of tracers. There was no significant difference in the detection rate between different surgical approaches [38]. As ICG has limited toxicity, higher bilateral detection rate and higher detection rate in obese patients especially with BMI >30, it has become more popular compared to other tracers [27][39][40].
The advantages and disadvantages of different methods are summarized in Table 1.
Table 1. Summary of the SLN detection rate with different injection sites and tracers. (ICG, indocyanine green; NA, not available; SLN, sentinel lymph node; SPECT, single-photon emission computerized tomography).
  SLN Detection Rate Other Advantages/Disadvantages
  Overall SLN Pelvic SLN Para-Aortic SLN Isolated Para-Aortic SLN Advantages Disadvantages
Cervical (dye) [19] 89% NA NA NA
  • Affordable
  • No special instrument is required
  • Has a small risk of allergic reaction, paradoxical methemoglobinemia and serotonin syndrome
  • Can be subjective in the visual assessment
Cervical (radioisotope) [19] 96% NA NA NA
  • Can allow pre-operative detection of SLN with SPECT
  • Can detect uncommon site of nodal metastasis
  • Allergic reaction is very rare (1–10/100,000)
  • Requires support from radiology departments
  • Requires gamma probe
  • Exposure to radiation
Cervical (ICG) [18][20][41] 82–95.1% 77–78% 19.5–59% 0–6%
  • Limited toxicity
  • Allergic reaction is very rare (1/42,000)
  • No radiation exposure
  • Good visibility
  • Expensive
  • Requires near-infrared fluorescent imaging system
Hysteroscopic (radioisotope) [19] 78% NA NA NA
  • Can allow pre-operative detection of SLN with SPECT
  • Can detect uncommon site of nodal metastasis
  • Allergic reaction is very rare (1–10/100,000)
  • Requires hysteroscopy
  • Requires support from radiology departments
  • Requires gamma probe
  • Exposure to radiation
Hysteroscopic (ICG) [18][20][41] 33–82.6% 25–53% 25–29% 4–8%
  • Limited toxicity
  • Allergic reaction is very rare (1/42,000)
  • No radiation exposure
  • Good visibility
  • Requires hysteroscopy
  • Requires near-infrared fluorescent imaging system
Dual injection (cervical and fundal) with dual tracer (ICG and radioisotope) [21] 100% 98% 66.7% NA
  • Good visibility
  • High detection rate
  • Expensive
  • Requires support from radiology departments
  • Requires gamma probe
  • Requires near-infrared fluorescent imaging system
  • Exposure to radiation

3.3. SLNB Algorithm

SLNB algorithm refers to (1) peritoneal and serosal inspection and peritoneal washings; (2) retroperitoneal evaluation localization of stained lymphatic channels from the parametria to the primary nodal basin, and removing all SLNs and any suspicious nodes, with frozen section if indicated (Figure 3a); (3) retroperitoneal dissection up to common iliac region, presacral region and/or para-aortic region to look for rare isolated para-aortic LN especially when no pelvic SLN is found (Figure 3b); (4) a side-specific systematic LND if SLN is not detected on the ipsilateral hemipelvis [17][26][42] (Figure 4). It has been shown that the rate of systematic LND was reduced from 65% to 23% since the introduction of such SLNB algorithm [26].
Figure 3. Sentinel lymph nodes. ICG was injected and SLNs were identified at left iliac (a) and right iliac (b) regions. When SLNs cannot be found in the pelvis, common iliac, presacral and para-aortic areas need to be explored. The picture illustrates a SLN at right common iliac near the presacral area (c,d).
Figure 4. Sentinel lymph node biopsy algorithm. (modified from the NCCN guideline [2]).
Standardization in techniques and algorithms for SLNB is important in the diagnostic accuracy of SLNB which ultimately affects the oncological outcomes of the patients. Moloney et al. developed a surgical competency tool for SLNB in minimally invasive surgery (MIS) for EC, and made a consensus recommendation on the use of tracer, injection sites and technique, the dissection for SLN, and importantly, the troubleshooting in SLN mapping failure [43].

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Subjects: Obstetrics & Gynaecology
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Wan Kam Chiu
,
Shuk Tak Kwok
,
Yaokai Wang
,
Hiu Mei Luk
,
Aaron Hei Yin Chan
,
Ka Yu Tse
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Update Date: 23 Nov 2022
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