Sentinel node concept in clinically n0 laryngeal and hypopharyngeal cancer.
BACKGROUND
Sentinel nodes (SNs) are the lymph nodes that directly receive lymphatic flow from a primary cancer lesion. The SN concept implies that lymphatic metastasis initially occurs at SNs. SN navigation surgery can be introduced for cancers in which the SN concept is established. In SN navigation surgery, lymph node dissection beyond SNs can be omitted if SNs are metastasis free. Although the SN concept has been investigated frequently for oral and oropharyngeal cancer, it has so far been investigated less for laryngeal and hypopharyngeal cancer. In this study, we investigated whether the SN concept is applicable for laryngeal and hypopharyngeal cancer.


METHODS
Twenty patients with T2-T4 and clinically N0 laryngeal and hypopharyngeal cancer were recruited. (99m)Tc-phytate was injected into several sites surrounding the tumor on the day before surgery. Lymphoscintigrams were acquired from at least two different viewpoints. SNs were surveyed intraoperatively, and neck dissections including at least levels II, III, and IV were performed.


RESULTS
SNs had occult metastases in five cases. In the remaining 15 cases, neither SNs nor other lymph nodes contained metastases, consistent with the SN concept. There was one false-negative case showing delayed nodal metastasis 2 years after initial surgery. The overall accuracy of the SN concept was 95%.


CONCLUSIONS
Our study shows that SN biopsy is a reliable strategy to determine correct lymph node status in N0 laryngeal and hypopharyngeal cancer. SN detection was valuable in evaluating the need for neck dissection, whether ipsilaterally or bilaterally.
Department of Otolaryngology-Head and Neck Surgery, National Defense Medical College, 3-2 Namiki, Tokorozawa, Saitama, 3598513, Japan.
Masayuki
M
Tomifuji
Akihiro
A
Shiotani
Hirofumi
H
Fujii
Koji
K
Araki
Koichiro
K
Saito
Koji
K
Inagaki
Makio
M
Mukai
Yuko
Y
Kitagawa
Kaoru
K
Ogawa
D000368:Aged; D004724:Endoscopy; D005260:Female; D006801:Humans; D007012:Hypopharyngeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D007822:Laryngeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008197:Lymph Node Excision; D008198:Lymph Nodes / Q000000981:diagnostic imaging* / Q000601:surgery; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D015609:Organotechnetium Compounds; D010833:Phytic Acid; D011877:Radionuclide Imaging; D019275:Radiopharmaceuticals; D021701:Sentinel Lymph Node Biopsy; D014057:Tomography, X-Ray Computed
D015609:Organotechnetium Compounds; D019275:Radiopharmaceuticals; C026177:technetium phytate; D010833:Phytic Acid