Sentinel Lymph Node Mapping of Oral Cancer Using Near-Infrared Fluorescence Imaging

Sentinel Lymph Node Mapping of Oral Cancer Using Near-Infrared Fluorescence Imaging

Cervical lymph node involvement, in head and cancer neck patients, is one of the most important prognostic factors. Currently patients undergo neck dissection removing some or all nodes and neck involvement is retrospectively determined. Sentinel lymph node (SLN) identification and biopsy has become clinical practise in other areas including breast, skin, and gastric cancer. The gold standard for detecting metastatic lymph nodes is pathological analysis, but the lack of an accurate or clinically accepted way to identify sentinel lymph nodes in the cervical region has motivated the usage of indocyanine green (ICG) and near-infrared fluorescence (NIR) imaging (Pinpoint, Novadaq, Waterloo). A prospective clinical trial using a commercially available NIR system and ICG injection around the tumour site will evaluate the ability to detect and biopsy sentinel lymph nodes in head and neck cancer patients.

Clinical systems for fluorescence imaging using ICG have recently been published with reported SLN identification rates of 94-100% in breast and colorectal cancers. The traditional radioisotope method enables navigation to the site of skin incision by measurement of radiation uptake, whereas the ICG fluorescence method can precisely identify the site of skin incision by tracing the lymphatic vessels across the skin and without radiation exposure. Systematic reviews have shown that the incidence of false negative SLN biopsy is high in head and neck applications. Therefore, the fluorescence SLN method, can potentially provide more precise information regarding which lymph nodes should be removed. As the ICG fluorescence technique can identify the basin that includes not only SLNs but also para-SLNs where the lymphatic vessels drain, the average number of lymph nodes removed also tends to increase. In preliminary studies, the ICG technique achieves a high identification rate comparable to that of the radioactive method. There has been to date, however, only limited studies of this technique in the area of oral cancer lymph node mapping. In our study we propose to evaluate the potential application of ICG in the mapping and detection of SLN in cancers of the head and neck in comparison with the radioactive agent method. We hypothesize that NIR-guided SLNB could present a new, safe and sensitive alternative or addition to the conventional SLN procedure.

Inclusion Criteria:

• The study will include patients with tumors or other masses in the following sites: oral cavity, oropharynx, nasal cavity, sinuses, nasopharynx, parapharyngeal space, parotid salivary glands, head and neck skin and skull base.
• N0 neck status
• The patients should have a complete and detailed medical record.
• Subjects must be at least 18 years of age.
• Subjects must sign and be given a copy of the written Informed Consent Form.

Exclusion Criteria:

• Patients who are not able to consent by themselves or grasp the implication of the study.
• Subjects participating in any other clinical trial during the time of this clinical investigation and that may have an impact on this evaluation.
• Pregnant or potentially pregnant woman
• Lactation.
• Iodine, shellfish, cough mixture, betadine or ICG allergy