Objective In 2008 GROINSS-V-I, the largest validation trial on the sentinel node (SN) procedure in vulvar cancer, showed that application of the SN-procedure in patients with early-stage vulvar cancer is safe. The current study aimed to evaluate long-term follow-up of these patients regarding recurrences and survival.
Methods From2000 until 2006 GROINSS-V-I included 377 patientswith unifocal squamous cell carcinoma of the vulva (T1,<4 cm), who underwent the SN-procedure. Only in case of SN metastases an inguinofemoral lymphadenectomy was performed. For the present study follow-up was completed until March 2015.
Results Themedian follow-up was 105 months (range 0179). The overall local recurrence ratewas 27.2% at 5 years and 39.5% at 10 years after primary treatment, while for SN-negative patients 24.6% and 36.4%, and for SN-positive patients 33.2% and 46.4% respectively (p = 0.03). In 39/253 SN-negative patients (15.4%) an inguinofemoral lymphadenectomy was performed, because of a local recurrence. Isolated groin recurrence rate was 2.5% for SN-negative patients and 8.0% for SN-positive patients at 5 years. Disease-specific 10-year survival was 91% for SN-negative patients compared to 65% for SN-positive patients (p < .0001). For all patients, 10-year disease-specific survival decreased from 90% for patients without to 69% for patientswith a local recurrence (p < .0001).
Conclusions Survival is very good for patientswith a negative SN, but still 36% of these patients, aswell as 46% of the patientswith a positive SN,will have a local recurrence. Although a local recurrence is treatedwith curative intent, the disease-specific survival of these patients decreases significantly.

Long-term follow-up, Sentinel node, Vulvar cancer
dx.doi.org/10.1016/j.ygyno.2015.09.077, hdl.handle.net/1765/86347
Gynecologic Oncology
Department of Gynaecology & Obstetrics

Te Grootenhuis, N.C, van der Zee, A.G.J, van Doorn, H.C, van der Velden, J, Vergote, I, Zanagnolo, V, … Oonk, M.H. (2015). Sentinel nodes in vulvar cancer: Long-term follow-up of the GROningen INternational Study on Sentinel nodes in Vulvar cancer (GROINSS-V) i. Gynecologic Oncology, 140(1), 8–14. doi:10.1016/j.ygyno.2015.09.077