The ability of lymphoscintigraphy to direct sentinel node biopsy in the clinically N0 neck for patients with head and neck squamous cell carcinoma

Comparison of SPECT/CT and Planar Lympho-scintigraphy in Sentinel Node Biopsies of Oral Cavity Squamous Cell Carcinomas

Introduction:

Evidence supporting the use of Sentinel node biopsy (SNB) for nodal staging of early oral squamous cell carcinomas (OSCC) appears to be very promising. Pre-operative lymphatic mapping using planar lymphoscinitigraphy (PL) with or without SPECT/CT in the SNB procedure is useful in sentinel node localization and for planning appropriate surgery. Recently, a large prospective multi-centric study evaluating SNB in cutaneous melanoma, breast and pelvic malignancies, demonstrated that adding SPECT to PL leads to surgical adjustments in a considerable number of patients. Our aim of this study was to evaluate the incremental value of additional SPECT/CT over PL alone in SNB for OSCC.

Materials and Methods:

This was a retrospective analysis of 44 patients (40- tongue, 4- buccal mucosa) with T1-T2, clinically N0 oral cavity SCC who underwent sentinel node biopsy procedure. PL and SPECT lymphoscinitigraphy images were compared for pre-operative mapping of sentinel nodes.

Results:

Using a handheld gamma probe, a total of 179 sentinel nodes were harvested, with a mean of 4.06 per patient. PL revealed 75 hotspots with a mean of 1.70 per patient, and SPECT/CT revealed 92 hotspots with a mean of 2.09 per patient. Additional hotpots were identified in 14 patients on SPECT/CT, which included 4 patients, where PL did not detect any sentinel nodes.

Conclusion:

Pre-operative SPECT/CT in addition to planar lympho-scinitigraphy in sentinel node biopsies of oral cavity SCC detects more number of sentinel nodes compared to planar imaging alone. The higher sensitivity of SPECT combined with better anatomical localization using diagnostic CT may further improve the precision of SNB procedure.

Evaluation of Immunohistochemical Fine Sectioning for Sentinel Lymph Node Biopsy in Oral Squamous Cell Carcinoma

Objective. To determine the level of sentinel lymph node sectioning necessary to accurately detect nodal micrometastasis.

Study Design. Cross-sectional.

Setting. Tertiary care university medical center.

Subjects and Methods. Fine sections of oral squamous cell carcinoma sentinel lymph nodes previously sectioned at 2-mm intervals in a prospective clinical trial were reexamined. The results yielded from prior hematoxylin and eosin and immunohistochemical staining were compared with results following exhaustive serial sectioning at 150-µm intervals using identical staining methods. These experimental findings were compared with pathologic results of immediate completion selective neck dissection, previously recorded prospectively.

Results. Reexamination of 35 sentinel nodes at 150-µm intervals has not revealed any missed micrometastatic disease at 2-mm intervals used initially. Both comparisons of 150-µm sectioning analysis to the original 2-mm section samples and to the neck dissection pathology reports demonstrate a 100% negative predictive value.

Conclusion. These data suggest that sentinel lymph node sectioning at 2-mm intervals for oral carcinoma using hematoxylin and eosin staining and then immunohistochemical analysis maximizes efficiency, accuracy, and expenditure for the detection of micrometastasis.

Sentinel lymph node mapping by indocyanin green fluorescence imaging in oropharyngeal cancer - preliminary experience

Background

Sentinel lymph node (SLN) detection and biopsy is gaining popularity in the treatment of Head and Neck cancer. Various methods in this regard have been described, each with their respective advantages and disadvantages. The aim of this paper was to evaluate the potential application of Indocyanin Green (ICG) in the mapping and detection of sentinel lymph nodes (SLN) in cancers of the head and neck.

Methods

Patients with oropharyngeal cancer and N0 neck who were scheduled for primary tumor ablation as well as a neck dissection were selected. One milliliter of Indocyanin green was injected around the tumor and the sentinel node detection was performed by aiming the infra red video camera on the cervical area. When no detection was possible transcutaneously, a cervical incision was made, a sub-platysmal flap raised and further detection was done to visualize the fluorescing lymph nodes.

Results

Detection of cervical SLN was only possible when 5 mm or less tissue covered the sentinel lymph node. Accurate and clear detection of the lymph drainage pattern and SLN was possible. There is some uptake in other tissues such as the submandibular gland which is easily distinguishable from lymphatic tissue.

Conclusion

Indocyanin green fluorescence is a potential valuable potential tool in the detection of SLN in patients with oropharyngeal cancer which warrants further investigation.

SPECT/CT for Lymphatic Mapping of Sentinel Nodes in Early Squamous Cell Carcinoma of the Oral Cavity and Oropharynx

Adequate staging and treatment of the neck in squamous cell carcinoma of the oral cavity and oropharynx (OSCC) is of paramount importance. Elective neck dissection (END) of the clinical N0-neck is widely advocated as neck treatment. With regard to the prevalence of 20–40% of occult neck metastases found in the ND specimens, the majority of patients undergo surgery of the lymphatic drainage basin without therapeutic benefit. Sentinel node biopsy (SNB) has been shown to be a safe, reliable and accurate alternative treatment modality for selected patients. Using this technique, lymphatic mapping is crucial. Previous reports suggested a benefit of single photon emission computed tomography with CT (SPECT/CT) over dynamic planar lymphoscintigraphy (LS) alone. SPECT/CT allows the surgeon for better topographical orientation and delineation of sentinel lymph nodes (SLN's) against surrounding structures. Additionally, SPECT/CT has the potential to detect more SLN's which might harbour occult disease, than LS. SPECT/CT is recommended to be used routinely, although SPECT/CT is not indispensable for successful SNB.

Joint practice guidelines for radionuclide lymphoscintigraphy for sentinel node localization in oral/oropharyngeal squamous cell carcinoma

Involvement of the cervical lymph nodes is the most important prognostic factor for patients with oral/oropharyngeal squamous cell carcinoma (OSCC), and the decision whether to electively treat patients with clinically negative necks remains a controversial topic. Sentinel node biopsy (SNB) provides a minimally invasive method of determining the disease status of the cervical node basin, without the need for a formal neck dissection. This technique potentially improves the accuracy of histological nodal staging and avoids over-treating three-quarters of this patient population, minimizing associated morbidity. The technique has been validated for patients with OSCC, and larger-scale studies are in progress to determine its exact role in the management of this patient population. This article was designed to outline the current best practice guidelines for the provision of SNB in patients with early-stage OSCC, and to provide a framework for the currently evolving recommendations for its use. These guidelines were prepared by a multidisciplinary surgical/nuclear medicine/pathology expert panel under the joint auspices of the European Association of Nuclear Medicine (EANM) Oncology Committee and the Sentinel European Node Trial Committee.

Contemporary management of cancer of the oral cavity

Oral cancer represents a common entity comprising a third of all head and neck malignant tumors. The options for curative treatment of oral cavity cancer have not changed significantly in the last three decades; however, the work up, the approach to surveillance, and the options for reconstruction have evolved significantly. Because of the profound functional and cosmetic importance of the oral cavity, management of oral cavity cancers requires a thorough understanding of disease progression, approaches to management and options for reconstruction. The purpose of this review is to discuss the most current management options for oral cavity cancers.

Joint Practice Guidelines for Radionuclide Lymphoscintigraphy for Sentinel Node Localization in Oral/Oropharyngeal Squamous Cell Carcinoma

Involvement of the cervical lymph nodes is the most important prognostic factor for patients with oral/oropharyngeal squamous cell carcinoma (OSCC), and the decision of whether to electively treat patients with clinically negative necks remains a controversial topic. Sentinel node biopsy (SNB) provides a minimally invasive method for determining the disease status of the cervical node basin, without the need for a formal neck dissection. This technique potentially improves the accuracy of histologic nodal staging and avoids overtreating three-quarters of this patient population, minimizing associated morbidity. The technique has been validated for patients with OSCC, and larger-scale studies are in progress to determine its exact role in the management of this patient population. This document is designed to outline the current best practice guidelines for the provision of SNB in patients with early-stage OSCC, and to provide a framework for the currently evolving recommendations for its use. Preparation of this guideline was carried out by a multidisciplinary surgical/nuclear medicine/pathology expert panel under the joint auspices of the European Association of Nuclear Medicine (EANM) Oncology Committee and the Sentinel European Node Trial (SENT) Committee.

Is there an additional value of SPECT/CT over planar lymphoscintigraphy for sentinel node mapping in oral/oropharyngeal squamous cell carcinoma?

BACKGROUND

Lymphatic mapping for sentinel node biopsy (SNB) has been shown to be crucial for detection of sentinel lymph nodes (SLN). Previous reports suggested a benefit of single photon emission computed tomography with CT (SPECT/CT) over dynamic planar lymphoscintigraphy (LS) alone. The aim was to assess whether there is an additional value of SPECT/CT over LS alone for lymphatic mapping of SLNs in oral/oropharyngeal SCC.

METHODS

A consecutive cohort of 58 patients was evaluated using SNB with additional SPECT/CT to preoperative LS.

RESULTS

In the entire cohort of 58 patients undergoing LS and SPECT/CT, hot spots could be revealed in all but 4 cases. The guidance of the handheld gamma probe was able to reveal 9 additional SLNs within 3 patients not detected by either modality. Lymphoscintigraphy showed full concordance with SPECT/CT in 81% of the cases. SPECT/CT was able to detect additional HS in 11 patients, in 1 case even with additional metastatic disease. The false negative rate for SNB was 6%, and the negative predictive value 98%.

CONCLUSIONS

SPECT/CT has the potential to detect more SLNs, which might harbor occult disease, than LS alone. With regard to the excellent results achieved with LS and the intraoperative use of the gamma probe, SPECT/CT is not indispensable for successful SNB. Both imaging modalities have difficulties in detecting level I sentinel nodes close to the injection site.

Intraoperative consultation (IOC) in mucosal lesions of the upper aerodigestive tract

Intraoperative consultation (frozen section) plays an important part in the treatment of the head and neck cancer patient. The appropriate use of intraoperative consultations (frozen sections) usually results in a definitive diagnosis with immediate therapeutic impact while the patient is in the operating room. Among the determinations made by frozen section analysis include the evaluation of adequacy of surgical margins of resection; the differentiation between nonneoplastic, benign and malignant proliferations; the evaluation of lymph nodes for the presence of metastatic disease; the determination of specimen identification and specimen adequacy, including the verification of such organs as the parathyroid glands; and the determination of whether a given case requires special diagnostic testing best performed on frozen material, such as for lymphomas. This paper focuses on intraoperative consultation of mucosal lesions of the upper aerodigestive tract, including epithelial dysplasia and squamous cell carcinoma. Other issues that often not diagnosed or at issue at the time of surgery, including the diagnosis of microinvasive carcinoma and differentiating inflammatory lesions from neoplastic lesions are included for completion.

Sentinel lymph node biopsy (SLNB) in management of N0 stage T1-T2 lip cancer as a "same day" procedure

Current management of N0 stage lip Squamous Cell Carcinoma (SCC) are prophylactic neck dissection, radiotherapy, or "watch and see" policy. The aim is the evaluation of the role of sentinel lymph node biopsy (SLNB) in their management based upon actual and not hypothetical presence of cervical lymph node (CLN) micrometastases as a same day procedure. Fourteen patients between November 2003 and August 2005 were included, nine men and five women, median age:57 years, (range 34-65 years). SLNB using preoperative lymphoscintigraphy and intra-operative localisation with patent blue and radioactive Tc(99m) Human Serum Albumin was performed. The median follow-up period was 26 months. Successful patent blue localisation in 13/14 whilst successful radio-localisation in all patients. Micrometastases were detected in 1/14 whom underwent therapeutic neck dissection. No local recurrence or regional lymph node involvement were detected. SLNB is a technically feasible and accurate approach for detection of CLN micrometastases in N0 stage lip SCC using the triple diagnostic localisation technique as a same day procedure.

Sentinel Node Biopsy for Oral and Oropharyngeal Squamous Cell Carcinoma of the Head and Neck

OBJECTIVES

The aims were to assess the technical feasibility of sentinel node biopsy (SNB), to validate SNB against elective neck dissection, and to report the results of the clinical application of the SNB concept for early oral and oropharyngeal squamous cell carcinoma.

STUDY DESIGN

Prospective consecutive cohort analysis.

METHODS

Between 2000 and 2006, a total of 79 patients were included. Lymphatic mapping consisted of preoperative lymphoscintigraphy and intraoperative use of a hand-held gammaprobe. Twenty-eight patients were assessed for feasibility and validation; the SNB was done in context with an elective neck dissection. Fifty-one patients were evaluated in an observational trial; elective neck dissection was performed only in case of positive SNB.

RESULTS

Validation revealed a sentinel node detection rate by lymphoscintigraphy of 93%, with the gammaprobe of 100%. The negative predictive value of a negative SNB was 100%. During the observational trial 40% of the patients were upstaged as a result of a positive SNB. Intraoperative frozen section analysis showed a negative predictive value of 83%. Two patients (6%) with negative SNB experienced a neck recurrence, the negative predictive value of SNB was therefore 94%. Patients with positive SNB were treated successfully with elective neck dissection.

CONCLUSIONS

SNB is technically feasible and reproducible with a high sentinel node detection rate. Validation against elective neck dissection revealed a negative predictive value of 100%. Application of the SNB concept in clinical practice was very successful. The recurrence rate within the neck was very low and the morbidity and cost of an elective neck dissection could be spared to 60% of the patients.

Sentinel node in head and neck cancer: use of size criterion to upstage the no neck in head and neck squamous cell carcinoma

BACKGROUND

Anatomical imaging tools demonstrate poor sensitivity in head and neck squamous cell carcinoma (HNSCC) patients with clinically node-negative necks (cN0). This study evaluates nodal size as a staging criterion for detection of cervical metastases, utilizing sentinel node biopsy (SNB) and additional pathology (step-serial sectioning, SSS; and immunohistochemistry, IHC).

METHODS

Sixty-five patients with clinically N0 disease underwent SNB, with a mean of 2.4 nodes excised per patient. Nodes were fixed in formalin, bisected, and measured in 3 axes before hematoxylin-eosin staining. Negative nodes were subjected to SSS and IHC. SNB-positive patients underwent modified radical neck dissection.

RESULTS

Maximum diameter was larger in levels II and III (13.1 and 13.2 mm) when compared with level I (10.5 mm; p = .004, p = .018), while minimum diameter was constant. Positive nodes were larger than negative nodes (p = .007), but nodes found positive by SSS/IHC were not significantly larger than negative nodes for either measurement (p = .433). Sensitivity and specificity were poor for all measurements.

CONCLUSIONS

Nodal size is an inaccurate predictor of nodal metastases and should not be regarded as an accurate means of staging the clinically N0 neck.

Sentinel lymph node biopsy in squamous cell carcinomas of the lips and the oral cavity—A single center experience

BACKGROUND AND OBJECTIVES

Despite the availability of initial data on sentinel lymph node biopsy (SLNB) in OSCC, its value in clinical practice remains unclear. The aim of this study is to evaluate the feasibility and potential of SLNB as a reliable staging procedure in early stage SCC of the lips and the oral mucosa.

METHODS

From 2001 to 2004, 40 patients with early stage SCC of the lips and oral cavity were enrolled. The main inclusion criteria were: cN0 category by MRI and ultrasound, tumor category T1-T2, for certain sites also T3. Patients with positive SLN underwent MRND and/or radiation. Patients with negative SLN were monitored monthly.

RESULTS

In eight patients, the SLN were positive. Two patients with negative SLN subsequently developed nodal disease (5% false negatives). Twenty-one patients have a follow-up longer than 24 months. Five patients died (one from nodal disease, one from local recurrence, and three from unrelated causes). One patient developed a second primary tumor, the remaining patients are free of disease.

CONCLUSIONS

SLNB may contribute to more targeted lymph node dissection strategies. Further studies will have to ensure the safety of this procedure in comparison to selective neck dissection.

Radiolocalized Sentinel Lymph Node Biopsy in Squamous Cell Carcinoma of the Oral Cavity and Analysis of Various Parameters

BACKGROUND

Sentinel lymph node (SLN) biopsy seems to be a method that solves the problem of neck management with oral squamous cell carcinoma. Using blue dye methods for detection of neck SLNs from the surface of the operative field seems difficult; therefore, we used radiolocalization alone to detect and extract sentinel nodes. Aside from the various histological and clinical parameters examined in this procedure, we also determined whether they had any clinical significance in relation to the detection of SLNs during the operation.

METHODS

Enrolled subjects had preoperative clinical N0 stage squamous cell carcinoma of the oral cavity and had received an unfiltered (99m)Tc sulfur colloid peritumoral injection. Localization of the SLNs was performed by using lymphoscintigraphy and a handheld gamma probe.

RESULTS

In total, 28 oral squamous cell carcinoma patients were included in this prospective study. Sixty-four SLNs in 27 patients were identified by this method. The identification rate was 96.4%. No false-negative predictions of SLN were noted among any of the patients studied. The numbers of the SLNs found during the operation were larger in patients with positive findings than those with negative findings (P < .05 by the Mann-Whitney U-test).

CONCLUSIONS

SLN radiolocalization provided an acceptable identification rate. The cases of positive findings for metastasis seemed to statistically have more SLNs than did those with negative findings, but more evidence is needed to prove this point. Therefore, SLN biopsies for extracting all possible high-risk nodes may be conducive for oral squamous cell carcinoma surgery.

Sentinel lymph node in carcinoma of the anal canal: a review

AIMS

To review the studies investigating the efficacy of the sentinel lymph node (SLN) procedure in anal canal carcinoma and to evaluate its potential role in guiding a more selective approach for patients with the malignancy.

METHODS

A literature search in the PubMed database was preformed using the key words "sentinel lymph node" and "anal cancer". All indexed original articles (except case reports) on the SLN procedure in cancer of the anal canal were analysed.

RESULTS

There are five published series to date. Eighty-four patients were studied. Rates of SLN detection and removal ranged from 66 to 100% of patients investigated. Nodal metastases were found in 7.1 to 42% of cases. No serious complications were reported.

CONCLUSIONS

The technique has proven to be safe and effective in sampling inguinal SLNs. The detection of occult metastases in clinically unsuspicious nodes represents an important improvement in the process of staging these patients, which has not been possible with any other method of diagnosis. Although SLN procedure is still in an early phase of investigation in this type of cancer, it emerges as an objective method to guide individual therapeutic decisions.

Détection du ganglion sentinelle dans les carcinomes épidermoïdes de la cavité buccale et de l’oropharynx. Étude préliminaire

INTRODUCTION

The sentinel lymph node is defined as the first relay of the lymphatic drainage of the tumor. Isotopic detection of the sentinel lymph node and absence of its metastatic invasion should theoretically be predictive of total drainage of the tumor. The goal of this study was to evaluate sentinel lymph node detectability by lymphoscintigraphy in N0 and/or N1 squamous-cell carcinoma of oral cavity and oropharynx and to determine its negative predictive value.

MATERIAL AND METHOD

Lymphoscintigraphy was used for sentinel lymph node detection. The procedure required peritumoral injection of technicium-labeled colloids to enable anatomical and cutaneous location of the sentinel lymph node. A one-way Tyco-Mallinckrodt probe was used for intraoperative detection of the sentinel lymph node. This prospective study included 21 patients with N0 or N1 squamous-cell carcinoma of the oral cavity and the oropharynx. The surgical attitude based on T and N was not modified in this prospective study without direct individual benefit for the patient. Neck dissection was achieved without difficulty.

RESULTS

The sentinel lymph node was identified in 20 out of 21 subjects. The sentinel lymph node was not identified in one patient with recurrence T2N0M0 squamous-cell carcinoma of the oropharynx radiated 3 years earlier. The percentage of false-negatives was 12.5% (1 false-negative out of 8 positive patients), giving a sensibility of the detection method of 87.5% (IC (95%)=[47.35-99.68]). This false-negative patient had a T3N0M0 squamous-cell carcinoma of the oropharynx with a sentinel lymph node removed in territory III. Neck dissection revealed 1 N + R- in the sub-mandibular territory associated with 27 N-R-. The probability of not finding a metastatic node at neck dissection when the sentinel lymph node is not metastatic (negative predictive value) was 92.3% (12/13) (IC (95)=[63.97-99.81]). The specificity of the method was 100%, as was the positive predictive value, because no sentinel node was diagnosed positive wrongly on frozen sections among patients without true histological node metastasis.

DISCUSSION

For routine care of patients with squamous-cell carcinoma of the oral cavity and the oropharynx detection of the sentinel lymph node is proposed primarily for patients with T1T2N0 staging. Larger tumors can modify the architecture and flow within the lymphatic ducts, and consequently even the concept of a sentinel lymph node. Systematic neck dissection is required or T3T4, even when N0. Our series of T1T2N0 tumors is too small to enable statistically significant conclusions. A low level of false-negative in a larger series would be necessary to propose this technique instead of convention neck dissection for T1T2 tumors of the oral cavity and oropharynx.

Role of sentinel node biopsy in the management and staging of the N0 neck

Sentinel node biopsy is being increasingly used as a staging tool for mucosal head and neck cancer. This review of the literature summarizes the results of research into the procedure when it has been performed in three main contexts: as part of an ipsilateral neck dissection, as a stand-alone procedure to stage the neck for positive or negative disease, and as a means of investigating the non-involved or contralateral neck in tumors close to or crossing the midline. The role of the procedure is discussed and the difficulties encountered are expanded, with a particular emphasis on pitfalls of the technique, caveats, and its potential role for the future.

Détection du ganglion sentinelle par lymphoscintigraphie dans les cancers epidermoïdes de la cavité buccale : étude prospective de 31 patients

INTRODUCTION

This study aimed at evaluating the relevance of sentinel node detection by lymphoscintigraphy in patients diagnosed with squamous-cell carcinoma of the oral cavity in the absence of neck adenopathy.

PATIENTS AND METHODS

A prospective study was carried out in 31 patients diagnosed with T1 to T3 squamous-cell carcinoma of the oral cavity without any clinically detectable neck adenopathy. A lymphoscintigraphy was performed the day before surgery. All patients underwent sentinel lymph node biopsy guided by a gamma-ray detecting probe and modified neck dissection. Pathologic evaluation of the sentinel lymph node included, in addition to the standard protocol, immunohistochemical analysis and thin sections of E stained preparations.

RESULTS

In 3 patients, the lymphoscintigraphy failed to detect any sentinel lymph node. In the remaining group of 28 patients, 20 patients showed a negative sentinel node concordant with a histologically negative neck dissection. In 5 patients, a positive lymph node was found although the rest of the neck dissection was negative. In 3 patients, sentinel lymph node was found to be negative but other neck nodes were positive. The overall sensitivity of lymphoscintigraphy in our study was 62%.

DISCUSSION

Surprisingly, the results of our study do not support the clinical usefulness of sentinel lymph node detection as a reliable and accurate staging method in patients with oral squamous cell carcinoma. We observed that lymphoscintigraphy was not a reliable method for detecting micrometastases in patients diagnosed with a squamous-cell carcinoma of the oral cavity without clinical evidence of neck matastases.

Positron Emission Tomography in Combination With Sentinel Node Biopsy Reduces the Rate of Elective Neck Dissections in the Treatment of Oral and Oropharyngeal Cancer

Purpose

To assess the impact of a diagnostic ladder including [18F]fluorodeoxyglucose positron emission tomography (PET) and lymphoscintigraphy guided sentinel node biopsy (LS/SNB) on neck treatment in patients with oral and oropharyngeal squamous cell carcinoma (OOSCC).

Patients and Methods

Prospectively, 62 patients with resectable T1-3 OOSCC underwent computed tomography (CT) and PET. Patients without neck uptake in PET were defined as cN0 and were accrued for LS/SNB. Results were correlated with histopathology. The traditional guidelines according to CT findings were compared to the actual regimen and the outcome.

Results

Sensitivity, specificity, validity, and positive and negative predictive value of PET versus CT were 72% v 89%, 82% v 77%, 79% v 80.5%, 62% v 61.5%, and 88% v 94.5% (not significant). Thirty-eight PET negative patients underwent LS/SNB. Sentinel lymph nodes were found in all 38 patients. Five patients had positive nodes (PET false-negatives) and underwent neck dissection (ND). Fifty-one neck sides in 36 patients who were CT-negative would have been treated with selective ND according to the guidelines, and at least 45 neck sides would have had to undergo extensive ND because of positive CT findings (96 of 124 neck sides). In contrast, PET in combination with LS/SNB spared 59 neck sides, and 41 of 124 neck sides actually underwent ND as a result of PET staging, LS/SNB, and intraoperative decision. After a median follow-up of 35 months, two patients (both cN+ve and pN+ve) suffered from neck relapses.

Conclusion

Diagnostics using PET in combination with LS/SNB considerably reduced the number of extensive ND in OOSCC as compared to CT without locoregional hazard.

Sentinel Node Biopsy in Head and Neck Cancer: Preliminary Results of a Multicenter Trial

BACKGROUND

The aim was to determine the reliability and reproducibility of sentinel node biopsy (SNB) as a staging tool in head and neck squamous cell carcinoma (HNSCC) for T1/2 clinically N0 patients by means of a standardized technique.

METHODS

Between June 1998 and June 2002, 227 SNB procedures have been performed in HNSCC cases at six centers. One hundred thirty-four T1/2 tumors of the oral cavity/oropharynx in clinically N0 patients were investigated with preoperative lymphoscintigraphy (LSG), intraoperative use of blue dye/gamma probe, and pathological evaluation with step serial sectioning and immunohistochemistry, with a follow-up of at least 12 months. In 79 cases SNB alone was used to stage the neck carcinoma, and in 55 cases SNB was used in combination with an elective neck dissection (END).

RESULTS

In 125/134 cases (93%) a sentinel node was identified. Of 59 positive nodes, 57 were identified with the intraoperative gamma probe and 44 with blue dye. Upstaging of disease occurred in 42/125 cases (34%): with hematoxylin-eosin in 32/125 (26%) and with additional pathological staging in 10/93 (11%). The sensitivity of the technique with a mean follow-up of 24 months was 42/45 (93%). The identification of SNB for floor of mouth (FOM) tumors was 37/43 (86%), compared with 88/91 (97%) for other tumors. The sensitivity for FOM tumors was 12/15 (80%), compared with 30/30 (100%) for other tumor groups.

CONCLUSION

SNB can be successfully applied to early T1/2 tumors of the oral cavity/oropharynx in a standardized fashion by centers worldwide. For the majority of these tumors the SNB technique can be used alone as a staging tool.

Value of sentinel lymphadenectomy in head and neck cancer

The increasing interest in the so-called sentinel node concept, which has recently been adapted to squamous cell carcinomas of the upper aerodigestive tract, can be explained by encouraging results in other tumor entities. Although the publications on this topic do not yet allow a final judgment on the significance of sentinel lymphadenectomy in head and neck squamous cell carcinoma, early results emphasize the importance of this new diagnostic and therapeutic concept. The basic prerequisite is a detailed knowledge of the existing method-specific limitations in this anatomic region. Critical and careful evaluation of the sentinel node concept is mandatory prior to its application to other tumor entities. Sentinel lymphadenectomy for head and neck cancer may prove helpful if the indications for its use are clearly defined.

Rationale for Sentinel Node Biopsy to Stage N0 Head and Neck Squamous-Cell Carcinoma

Sentinel node biopsy is an evolving staging tool in the management of patients with squamous-cell carcinoma of the head and neck. This tool provides a more detailed understanding of the lymphatic pathways within the head and neck and the role of these pathways regarding tumor spreading. By targeting nodes that are most likely to harbor disease, a more detailed pathological evaluation of sentinel nodes is possible-thus improving staging by the identification of micrometastases. The rationale behind the use of sentinel node biopsy to stage the N0 neck are discussed within this paper.

The sentinel node concept in head and neck cancer: solution for the controversies in the n0 neck?

BACKGROUND

The majority of patients with head and neck squamous cell carcinoma (HNSCC) who have a clinical N0 neck undergo neck dissection (ND) even though no lymph node metastases may be detected. With this background, our investigation critically analyzes the value of sentinel lymphadenectomy.

METHODS

Ninety patients with HNSCC, all staged with an N0 neck, underwent intraoperative 99mTc-radiolabeled detection of up to three hot nodes (SN1-3) during elective ND and primary site resection.

RESULTS

Sentinel lymphadenectomy (SN1-3) detected occult metastatic spread in 20 (22%) of 90 patients, whereas failure occurred in three of 90 patients. Metastatic spread was directed to level II in the majority (66.7%) of cases. If only the SN1 had been examined, the procedure would have failed in nine (39%) of 23 patients.

CONCLUSION

Sentinel lymphadenectomy correctly identified the stage of metastatic disease in 97% of patients in cases in which up to three sentinel nodes were identified. If only the lymph node with the highest tracer activity had been excised, 39% of cancer-positive necks would have been missed. Selective ND identified metastatic disease in the additional 3% of patients.

New fields of application of the sentinel lymph node biopsy in the pathologic staging of solid neoplasms: review of literature and surgical perspectives

Sentinel lymph node (sN) biopsy has gained special attention among surgical and medical oncologists as it represents an accepted technique for detecting occult nodal disease in regional lymph nodes of patients with melanoma and breast cancer. The histopathologic examination of the sN may well predict regional lymph node status in order to define the most suitable loco-regional and systemic treatment. Recently, this technique has also been applied to other solid tumor types such as gynecologic and urologic malignancies, squamous head and neck cancer, thyroid cancer, non-small-cell lung cancer, Merkel cell carcinoma, and gastric cancer. The aim of this literature review is to define the rationale of sN biopsy in these tumor sites, the most effective procedure for sN detection, and the accuracy of the sN in predicting regional nodal status, as well as the surgical perspectives of sN biopsy application.

Improved Staging of Cervical Metastases in Clinically Node-Negative Patients With Head and Neck Squamous Cell Carcinoma

BACKGROUND

The management of the N0 neck in oral and oropharyngeal cancer is often determined by the risk of metastases related to features of the primary tumor. Where the risk of metastases is >20%, elective neck dissection (END) has been advocated. This study reviewed clinical staging, surgical staging, pathologic staging, and histopathologic parameters to determine the prediction of nodal metastases and micrometastases in patients with head and neck squamous cell carcinoma.

METHODS

A prospective series of 61 clinically neck node-negative patients undergoing surgical resection of a T1/2 intraoral or oropharyngeal invasive squamous cell carcinoma and surgical staging of the neck, with sentinel node biopsy (SNB) alone or SNB-assisted END, between June 1998 and March 2002 were included in this study.

RESULTS

Pathologic upstaging of the clinically N0 neck occurred in 27 (44%) of 61 patients. Routine pathology with hematoxylin and eosin upstaged disease in 22 of 27 patients (sensitivity of 81%). Five patients with micrometastasis were staged pN1mi after stepped serial sectioning and immunohistochemistry. Tumor thickness, a noncohesive invasive front, and perineural and bone invasion were all histological predictors for cervical metastases. Five patients with micrometastases were staged pN1mi.

CONCLUSIONS

Both clinical staging and routine pathologic staging underestimate the presence of nodal metastases. Staging with either SNB alone or SNB-assisted END shows promise in the management of the N0 neck by identifying patients with micrometastases (pN1mi).