|Year : 2019 | Volume
| Issue : 1 | Page : 8-12
Metastatic involvement of level IIb nodal station in oral squamous cell carcinoma: A clinicopathological study
Partha S Chakraborty1, Ashok Kumar Das2, Ashutosh Vatsyayan3, Tashnin Rahman2, Rajjyoti Das2, Seemanta Kumar Medhi2, Kishore Das2, Jagganath Dev Sharma4
1 Department of Oral and Maxillofacial Surgery, Regional Dental College and Hospital, Guwahati, Assam, India
2 Department of Head and Neck Oncology, Dr. Bhubaneswar Borooah Cancer Institute, Guwahati, Assam, India
3 Department of Head and Neck Surgical Oncology, HCG Cancer Centre, Ahmedabad, Gujarat, India
4 Department of General Pathology, Dr. Bhubaneswar Borooah Cancer Institute, Guwahati, Assam, India
|Date of Submission||23-Oct-2018|
|Date of Decision||13-Nov-2018|
|Date of Acceptance||22-Nov-2018|
|Date of Web Publication||7-Jun-2019|
Dr. Ashutosh Vatsyayan
Department of Head and Neck Oncology, HCG Cancer Centre, Sola-Science City Road, Off S.G Highway, Ahmedabad, Gujarat
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: The purpose of this study was to determine the prevalence of Level IIb metastasis in patients with oral squamous cell carcinomas (OSCCs).
Materials and Methods: A total of 110 newly diagnosed oral cavity cancer patients requiring surgery as the primary modality were included in the study. Preoperative clinical examinations were done and tumor-node-metastasis staging was noted. Intraoperatively, Level IIb nodal tissue was dissected and sent separately.
Results: A total of 129 neck dissections (58 SOHD, 67 modified neck dissections, and 4 radical neck dissections) were carried out in 110 patients (males = 80 and females = 30), 91 patients required unilateral neck dissection, and 19 patients required bilateral neck dissection. Out of these 129 neck dissections, only 4 (3.2%) neck dissections (in a total of 3 patients out of 110 patients) had Level IIb positive (with bilateral Level IIb involvement in one patient).
Conclusions: Dissection of the Level IIb region in patients with OSCC may be required only in cases with advanced N stage, positive Level IIa lymph nodes, and extracapsular spread. Furthermore, in tongue cancers (high propensity of isolated Level II involvement), retromolar trigone, and floor of mouth cancers, routine Level IIb clearance should be considered.
Keywords: Level IIb, lymph node, neck dissection, nodal metastasis, oral squamous cell carcinoma
|How to cite this article:|
Chakraborty PS, Das AK, Vatsyayan A, Rahman T, Das R, Medhi SK, Das K, Sharma JD. Metastatic involvement of level IIb nodal station in oral squamous cell carcinoma: A clinicopathological study. Natl J Maxillofac Surg 2019;10:8-12
|How to cite this URL:|
Chakraborty PS, Das AK, Vatsyayan A, Rahman T, Das R, Medhi SK, Das K, Sharma JD. Metastatic involvement of level IIb nodal station in oral squamous cell carcinoma: A clinicopathological study. Natl J Maxillofac Surg [serial online] 2019 [cited 2019 Nov 21];10:8-12. Available from: http://www.njms.in/text.asp?2019/10/1/8/259844
| Introduction|| |
The treatment and management of malignancies of the head and neck, including oral cavity is directly altered by the presence of metastatic cervical lymphadenopathy. The lymphatic drainage is site specific and occurs in a predictable manner.
The main routes of the cervical lymph node spread are through the first-station nodes (Levels I and II) and second-station nodes including the Levels III, IV, and V.
Several modifications to the classical radical neck dissection (RND) have been employed aiming to reduce the morbidity. Several reports have suggested spinal nerve dysfunction with associated morbidity even in patients who undergo modified or selective neck dissections. Hence, the option of omitting dissection at sublevels IIb and V in patients with clinically negative neck is being considered by some investigators.,,
Level IIb lymph nodes contained in the submuscular recess are the lymph nodes lying over the fascia of the splenius capitus and levator scapulae, above the spinal accessory nerve, posterolaterally bordered by the sternocleidomastoid muscle, and superiorly by the skull base.
The incidence of nodal metastasis at Level IIb in oral cavity cancer has been recently investigated to look for the feasibility of avoiding dissection in this area as this procedure may cause postoperative shoulder syndrome even in the presence of an integral spinal accessory nerve. The purpose of this study is to clincopathologically determine the incidence of Level IIb involvement in oral cavity squamous cell carcinomas and the effect of different T-staging as well as other cervical nodal involvement on Level IIb station.
| Materials and Methods|| |
From May 2013 to May 2014, 110 newly diagnosed oral cavity cancer patients attending Head-and-Neck Outpatient Department, Dr. B. Borooah Cancer Institute, Guwahati, requiring surgery as the primary modality were included in the study. Preoperative clinical examinations were done and tumor-node-metastasis staging was noted. Any clinical Level II involvement was documented. Intraoperatively, Level IIb nodal tissue was dissected and sent separately. Postoperative adjuvant therapy was given as indicated.
| Results|| |
A total of 129 neck dissections (58 SOHDs, 67 modified neck dissections, and 4 RNDs) were carried out in 110 patients (males = 80 and females = 30), 91 patients required unilateral neck dissection and 19 patients required bilateral neck dissection [Figure 1] and [Figure 2]. Out of these 129 neck dissections, only 4 (3.2%) neck dissections (in a total of three patients out of 110 patients) had Level IIb positive (with bilateral Level IIb involvement in one patient).
|Figure 1: Total number of patients included in the study (total = 110, male = 80 and female = 30)|
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|Figure 2: Different types of neck dissection (total = 129, SOHD = 58, modified neck dissections = 67, radical neck dissection = 4)|
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Out of the total of 110 patients, 57 patients were clinically N0, whereas 53 patients were cN+. Out of these 53 patients, 41 were cN1, 12 were cN2 (N2a = 7, N2b = 4, and N2c = 1), and cN3 was seen in none of the patients [Figure 3].
Out of the total 110 patients, 51 (46.36%) patients were found to have positive neck nodes in postoperative histopathology status. Out of 57 patients having cN0, 13 (22.8%) were pN+, whereas out of 41 patients having cN1, 26 were found to be pN+. All cN2 (n = 12) patients were pN+. Hence, out of 110 patients, 51 were found to be pN+.
Out of the 59 patients who had cNo neck, none of them had Level IIb involvement. Three patients (four neck dissection all of which were RND) had Level IIb positive [Figure 4]. This included one patient with cN2c (floor of mouth primary) and was found to have bilateral pN + and with bilateral Level IIb involvement, one patient with cN2b (primary in retromolar trigone [RMT]), and one patient with cN1 (primary in tongue).
Isolated Level IIb involvement was not observed in any neck dissection, and it occurred only in association with a pN+Level IIa, with perinodal spread seen in all the four specimens.
Isolated Level IIa involvement was observed in three patients all with primary in tongue (3/11) and hence showed a 27.2% chance of isolated Level IIa involvement in tongue cancers.
On a median follow-up of 18 months, 29 (26.4%) patients presented with residual or recurrent disease. Most of the failure occurred locally (79.3%) and only 6 (20.6%) patients had regional failure and out of these one regional failure was observed in pN0 patient.
| Discussion|| |
Oral cancer accounts for 10.7% of all solid tumors in males and females in high-incidence areas, such as India. Metastases to the regional lymph nodes are the single most important prognostic factor in predicting local and distant failure as well as survival. The nodal metastasis reduces the survival by 50%.
Nodal metastasis in oral cancers is largely predictable with the Levels I to III being most commonly involved. Skip metastasis to the Levels IV or V in the absence of disease in the upper level is around 4%–5% except in the tongue where it approaches 16%., The cancer of the buccal mucosa and lower alveolus together called the gingivobuccal complex cancer, which is the most common form of oral cancer in India. Lymph nodal metastasis even with the mandibular involvement is <50%. Clinically enlarged nodes are often inflammatory or reactive., Although a variety of tools are available for the detection of nodal metastasis, 20%–50% of clinically node-negative patients are found to have metastasis on final histopathology report.,, They develop clinical disease usually within 2 years if the neck is not treated initially., The incidence of occult metastases varies with the site, size, and thickness of the primary tumor. Elective treatment of neck is indicated if this incidence reaches 15%–20%. D'Cruz et al. (2015) carried a prospective, randomized, controlled trial, evaluating the effect on survival of elective node dissection (ipsilateral neck dissection at the time of the primary surgery) versus therapeutic node dissection (watchful waiting followed by neck dissection for nodal relapse) in patients with lateralized stage T1 or T2 oral squamous cell carcinomas. They concluded that among patients with early-stage oral squamous cell cancer, elective neck dissection resulted in higher rates of overall and disease-free survival as compared to therapeutic neck dissection.
The standard treatment for patients with clinically palpable metastatic lymph nodes has been comprehensive neck dissection. Classical RND involves resection of Level I–V lymph nodes along with the tail of parotid, submandibular gland, sternocleidomastoid muscle, internal jugular vein, and spinal accessory nerve. Although it is an oncologically safe procedure that significantly reduces the risk of regional recurrences, it produces significant postoperative morbidity, mainly shoulder dysfunction. Aiming to reduce the morbidity, several modifications to this procedure have been employed.
Several reports have suggested spinal nerve dysfunction with associated morbidity even in patients who undergo modified or selective neck dissections. Hence, the option of omitting dissection of sublevels IIb and V in patients with clinically negative neck is being considered by some investigators.,,
Lim et al. carried out a study to determine whether Level IIb lymph nodes can be saved in elective supraomohyoid neck dissection (SOHND) as a treatment for patients with squamous cell carcinoma of the oral cavity. Seventy-four patients with squamous cell carcinoma of the oral cavity and with no palpable lymph nodes at the neck who underwent an elective SOHND were prospectively studied. Of the 74 patients, 24 (32%) had lymph nodes positive for microscopic metastatic squamous cell carcinoma. Four (5%) of the 74 patients had involvement of Level IIb lymph nodes. There was no instance of isolated metastasis to Level IIb lymph nodes without involvement of other nodes in the SOHND specimens. There were six cases of the ipsilateral neck recurrences, and of these, two patients (3% of all patients) developed recurrences in the Level II lymph nodes. They concluded that Level IIb lymph node metastasis was rare in this study, and nodal recurrence in this area after SOHND in squamous cell carcinoma of the oral cavity was infrequent. Therefore, this region may be preserved in elective SOHND in patients with squamous cell carcinoma of the oral cavity. Dabholkar and Kapre carried out a nonrandomized prospective observational study where 65 patients of oral cavity cancers were evaluated. All patients underwent Level IIb dissection. Out of 67 neck dissections (27 elective and 40 therapeutic), seven patients had Level IIb positive for metastases (10.44%) with no isolated or contralateral metastases at Level IIb and direct correlation with Level IIa nodes. There was no statistical association of Level IIb positivity with stage or site of primary. They concluded that Level IIb dissection can be avoided in N0 necks. For therapeutic neck dissections, Level IIb should be cleared if there are positive nodes at Level IIa.
However, we also found that most of the literature available on the incidence and patterns of nodal metastasis is from the Western world where tongue and floor of the mouth cancers are more common than gingivobuccal complex cancers. Prediction of the lymphatic spread could help in choosing the appropriate surgical procedure for both clinically positive and negative necks. Therefore, the present study was designed to determine the incidence of Level IIb involvement in different oral cavity subsites cancer.
In this study, a total of 129 neck dissections were carried out in 110 patients; where, 19 requiring bilateral neck dissection. Out of this 129 neck dissections, only four had Level IIb positive (with bilateral Level IIb involvement in one patient).
None of the patients those who were clinically N0 had Level IIb involvement. The percentage of occult metastases at Level IIb alone was 0%. They occur only in combination with other level involvement in cN+ neck. In this study, positive Level IIb was always associated with a positive Level IIa and perinodal spread. The only case in which Level IIb was positive bilaterally had primary in floor of the mouth and had a cN2c staging. In other two cases, the primary was in tongue and RMT region with clinical nodal staging cN1 and cN2b, respectively. These results show that the risk of Level IIb depends on cN staging, perinodal spread, and its Level IIa status. However, we could not find any significant relationship between T-Stage and Level IIb involvement; however, subsites such as tongue, RMT, and floor of mouth can be considered as critical subsites when considering surgical clearance regarding Level IIb even in cN0 cases. Manola et al. and Silverman et al. too found similar results.,
| Conclusions|| |
Level IIb dissection can be avoided in clinically no neck in oral cavity cancer. Hence, the operative time can be shortened by avoiding an unnecessary step, also providing the added advantage of minimal morbidity due to possible spinal accessory nerve injury. The identification of several risk factors such as advanced N stage, positive Level IIa lymph nodes, and extracapsular spread may help to further delineate which subset of patients undergoing selective neck dissection is likely to benefit from dissection of the Level IIb. Furthermore, in tongue cancers (high propensity of isolated Level II involvement), RMT, and floor of mouth cancers (high propensity of early and extensive regional metastasis), routine Level IIb clearance should be considered. By preserving Level IIb, we can limit the potential morbidity associated with dissection without compromising the oncologic integrity of Level IIb as a staging or therapeutic procedure in the management of head-and-neck cancer. Furthermore, the molecular study of detecting micrometastasis could be useful in determining a more accurate percentage of nodal involvement.
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Conflicts of interest
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[Figure 1], [Figure 2], [Figure 3], [Figure 4]