Diagnostic lymph node extirpation in CUP syndrome - useful or damaging?

Area of Science:

• Oncology
• Head and Neck Surgery
• Diagnostic Pathology

Background:

• Cervical lymph node metastasis without a detectable primary tumor, known as cancer of unknown primary (CUP) syndrome, presents a diagnostic challenge.
• The optimal diagnostic and therapeutic strategy for these cases remains a subject of ongoing debate.

Purpose of the Study:

• To evaluate the long-term outcomes and impact of diagnostic approaches in patients with cervical squamous cell carcinoma of unknown primary syndrome.
• To compare the effectiveness of diagnostic lymph node extirpation versus direct therapeutic neck dissection.

Main Methods:

• Retrospective analysis of clinical data from 75 patients treated for cervical squamous cell carcinoma of unknown primary syndrome.
• Assessment of primary tumor demarcation over time and the influence of diagnostic lymph node extirpation on subsequent treatment, including neck dissection and adjuvant radiotherapy.

Main Results:

• The primary tumor became apparent in 12% of patients during the follow-up period (up to 5.3 years).
• Patients not receiving adjuvant radiotherapy showed a higher rate (38%) of primary tumor demarcation.
• Diagnostic lymph node extirpation delayed definitive therapy by an average of 3 weeks and was associated with a higher rate of modified radical neck dissection (62% vs. 41%).

Conclusions:

• A significant proportion of primary tumors in cervical cancer of unknown primary syndrome can be identified during the disease course.
• Diagnostic lymph node extirpation, compared to direct therapeutic neck dissection, leads to delayed treatment and an increased need for more extensive surgical intervention.