Role of Pelvic lymph node dissection in ca vulva. Give detailed overview from latest medical journal and evidence. Make flowcharts and tables.
pelvic lymph node dissection vulvar cancer
pelvic lymph node dissection vulvar cancer FIGO NCCN ESGO guidelines 2024 2025
vulvar cancer inguinofemoral lymphadenectomy outcomes sentinel node
https://pmc.ncbi.nlm.nih.gov/articles/PMC12411818
vulvar cancer pelvic lymph node dissection GOG 37 radiotherapy
PMID: 42172493
vulvar cancer positive lymph nodes adjuvant radiotherapy survival prognosis
PMID: 34432481
vulvar cancer FIGO staging lymph node management 2021
PMID: 35565394
PMID: 40277771
vulvar cancer Cloquet node pelvic lymph node metastasis prognosis
vulvar cancer groin node positive pelvic node radiation versus surgery
PMID: 38170388
| FIGO Stage | TNM | Criteria | 5-yr Survival |
|---|---|---|---|
| IA | T1a N0 M0 | ≤2 cm, stromal invasion ≤1 mm, no nodal metastasis | ~98% |
| IB | T1b N0 M0 | >2 cm OR invasion >1 mm, negative nodes | ~85% |
| II | T2 N0 M0 | Extension to lower urethra/vagina/anus, negative nodes | ~75% |
| IIIA | T1-2 N1a M0 | 1-2 LN metastases (<5 mm) | ~60% |
| IIIA | T1-2 N1b M0 | 1 LN metastasis (≥5 mm) | ~60% |
| IIIB | T1-2 N2a M0 | 3+ LN metastases (<5 mm) | ~40% |
| IIIB | T1-2 N2b M0 | 2+ LN metastases (≥5 mm) | ~40% |
| IIIC | T1-2 N2c M0 | Positive nodes with extracapsular spread | ~30% |
| IVA | T3 Any N | Invades upper urethra/vagina/bladder/rectum/fixed nodes | ~15% |
| IVB | Any T, Any N, M1 | Distant metastasis, including pelvic LN metastasis | <10% |
Note: Pelvic lymph node metastasis is classified as Stage IVB (distant metastasis) in FIGO 2021, reflecting its very poor prognosis.
Vulvar primary tumor
│
▼
Superficial Inguinal Nodes (primary drainage)
│
▼
Deep Inguinal/Femoral Nodes (Cloquet's node = most medial femoral node)
│
▼ (SKIP METASTASIS IS RARE)
External Iliac → Obturator → Internal Iliac Nodes
│
▼
Common Iliac → Para-aortic Nodes
| Inguinofemoral Node Status | Risk of Pelvic LN Metastasis | Management Implication |
|---|---|---|
| All nodes negative | <1% (essentially zero) | No pelvic treatment needed |
| 1 small node positive (<5 mm), no ECS | ~3-5% | RT may not be needed; monitor |
| 1 large node positive (≥5 mm) | ~10-15% | Adjuvant RT to groin and pelvis |
| 2+ nodes positive | ~20-25% | Adjuvant RT to groin and pelvis (GOG 37) |
| 3+ nodes positive | ~30-40% | High priority for pelvic RT/chemoRT |
| Extracapsular spread (ECS) present | ~35-45% | Adjuvant chemoRT mandatory |
| Fixed/ulcerated groin nodes | Very high | Primary chemoRT to pelvis + groin |
| Cloquet's node positive (intraoperative) | ~60-80% | Pelvic RT essential; consider debulking |
| Outcome | Pelvic Node Dissection | Groin + Pelvic RT | P-value |
|---|---|---|---|
| 2-year Overall Survival | 54% | 68% | P=0.03 |
| 2-year Cancer-Specific Survival | 54% | 75% | P=0.004 |
| Groin failure rate | 24% | 5% | Significant |
| 6-year OS (long-term follow-up) | ~29% | ~51% | HR 0.49, P=0.015 |
| Indication | Evidence Level | Notes |
|---|---|---|
| Bulky/enlarged pelvic nodes on preoperative imaging (CT, PET-CT, MRI) | Level 2B (NCCN); Grade C (ESGO) | Extraperitoneal node debulking BEFORE radiation - bulky nodes cannot be sterilized by RT alone |
| Cloquet's node positive on intraoperative frozen section | Expert consensus | Historical indication; now largely replaced by preoperative imaging assessment |
| Clinically suspicious pelvic nodes on PET-CT | Level 2B | Biopsy or resection to alter treatment planning |
| Residual pelvic nodes after chemoRT (select cases) | Level 2B (NCCN) | GOG data support resection of residual nodes post-chemoRT if no distant metastasis |
| Pelvic recurrence limited to pelvic nodes | Level 2B | Surgical resection if previously irradiated and resectable |
The main current role of pelvic lymph node surgery is DEBULKING of macroscopic pelvic disease identified on imaging, prior to adjuvant radiation - not systematic dissection.
┌─────────────────────────────────────────────────────────┐
│ INVASIVE VULVAR CANCER │
│ (Stromal invasion > 1 mm, i.e., ≥Stage IB) │
└───────────────────────────┬─────────────────────────────┘
│
┌─────────────▼─────────────┐
│ PREOPERATIVE ASSESSMENT │
│ Clinical exam + Imaging │
│ (CT/PET-CT/MRI/US groins)│
└─────────────┬─────────────┘
│
┌──────────────────┴───────────────────┐
│ │
▼ ▼
CLINICALLY/IMAGING CLINICALLY SUSPICIOUS
NEGATIVE NODES or FIXED NODES
│ │
▼ │
Eligible for SLN? │
• Unifocal tumor │
• Tumor < 4 cm │
• No prior groin surgery │
│ │
YES │ NO │
▼ ▼ ▼
SLN BIOPSY BILATERAL PRIMARY CHEMORADIATION
(Tc-99m ± INGUINOFEMORAL (45 Gy + weekly cisplatin)
Blue dye LYMPHADENECTOMY │
± ICG) │ │
│ │ Consider resection of
│ │ residual bulky nodes
│ │ post-chemoRT
│ │
├─ SLN NEGATIVE ─────────────────────────────────────────┐
│ No further node surgery; observe │
│ │
└─ SLN POSITIVE ──────────────────────────────────────────┤
│ │
MICROMETASTASIS MACROMETASTASIS (>2 mm) │
(≤2 mm, no ECS) OR ECS │
│ │ │
▼ ▼ │
Inguinofemoral RT FULL INGUINOFEMORAL │
(50 Gy) - LYMPHADENECTOMY │
GROINSS-V II data (Complete IFL) │
│ │
┌──────▼─────────────────────────┘
│ AFTER IFL: ASSESS NODE STATUS │
└──────┬─────────────────────────┘
│
┌──────────────────────┴───────────────────────┐
│ │
▼ ▼
NODES NEGATIVE NODES POSITIVE
No further treatment │
for nodes ┌─────────────┼──────────────┐
│ │ │
▼ ▼ ▼
1 NODE+ 2+ NODES+ ECS PRESENT
No ECS OR ≥1 LARGE ANY NUMBER
(<5 mm) NODE+ │
│ │ │
▼ ▼ ▼
Adjuvant RT ADJUVANT ADJUVANT
(groin only, CHEMORADIATION CHEMORADIATION
may omit) GROIN + GROIN + PELVIS
PELVIS (mandatory)
(45-50 Gy)
│
┌───────────────▼────────────────┐
│ PRE-RT: IMAGE PELVIC NODES │
│ CT/PET-CT for pelvic LN status │
└───────────────┬────────────────┘
│
┌───────────────────────┤
│ │
▼ ▼
PELVIC NODES BULKY PELVIC NODES
NOT ENLARGED IDENTIFIED ON IMAGING
│ │
▼ ▼
Standard pelvic RT EXTRAPERITONEAL PELVIC
(included in field) NODE DEBULKING SURGERY
(PLND - limited)
THEN RT to pelvis
(cannot sterilize
bulky disease with
RT alone)
| Parameter | Pelvic Lymph Node Dissection | Pelvic Radiotherapy |
|---|---|---|
| Overall Survival (GOG 37, 6-yr) | 29% | 51% |
| Groin recurrence rate | 24% | 5% |
| Morbidity | High (lymphedema, bowel injury) | Moderate (acute GI, lymphedema) |
| Ability to sterilize bulky nodes | Yes (mechanically) | Limited (>2-3 cm nodes) |
| Current guideline recommendation | NOT routine; debulking only for bulky nodes | PREFERRED over PLND (GOG 37 evidence) |
| Best candidates | Bulky/enlarged pelvic nodes on imaging | All node-positive cases without bulky pelvic nodes |
| Evidence level | Level I (against routine PLND) | Level I (GOG 37 RCT) |
| Trial | Year | N | Key Finding |
|---|---|---|---|
| GROINSS-V I | 2008 | 377 | SLN feasible; 2.5% groin recurrence in SLN-negative patients; safe in unifocal <4 cm tumors |
| GOG-173 | 2012 | 452 | SLN sensitivity 91.7%; false-negative rate 3.7%; acceptable in unifocal <4 cm |
| GROINSS-V II | 2021 (PMID: 34432481) | 1,535 | RT = safe alternative to IFL for micrometastases (≤2 mm); RT inferior to IFL for macrometastases (>2 mm) - groin recurrence 22% vs 6.9% |
| Cochrane Review | ~2020 | 2,396 groins | Blue dye + Tc-99m: detection rate 98%, sensitivity 0.95, NPV >95% |
| GROINSS-V long-term | 2022 | 377 | 5-yr local recurrence 27.2%; isolated groin recurrence 2.5% (negative SLN) |
| Gracia et al. (2025) (PMID: 40277771) | 2025 | Review | SLN valid in unifocal <4 cm; limitations in recurrent disease and larger tumors |
| Bogani et al. (2026) (PMID: 42172493) | 2026 | Review | False-negative rate 7-10% in some series (up to 27%); ultrastaging mandatory |
✅ ELIGIBLE for SLN biopsy: ❌ NOT eligible (proceed to IFL):
• Unifocal tumor • Multifocal disease
• Tumor diameter < 4 cm • Tumor ≥ 4 cm
• Stromal invasion > 1 mm • Clinically/radiologically suspicious nodes
• Clinically negative groin nodes • Prior groin surgery/lymphadenectomy
• No prior inguinofemoral surgery • Tumor involving midline structures (controversial)
• Adequate surgical expertise • Inadequate surgical volume/expertise
• Appropriate infrastructure • T1a (≤1 mm invasion) - no groin Rx needed
| SLN Finding | Definition | Recommended Management | Groin Recurrence Rate |
|---|---|---|---|
| Negative | No tumor cells | No further node surgery or RT | ~2.5% |
| Isolated tumor cells (ITC) | ≤0.2 mm | Controversial; treat as micrometastasis | ~3-4% |
| Micrometastasis | >0.2 to ≤2 mm | Inguinofemoral RT (50 Gy) - SAFE | ~1.6% at 2 yrs |
| Macrometastasis | >2 mm | Complete IFL + adjuvant RT | ~6.9% (IFL) vs 22% (RT alone) |
| Extracapsular spread | Any size with ECS | Complete IFL + adjuvant chemoRT | High without treatment |
| Indication | Evidence | Recommendation |
|---|---|---|
| 2 or more positive inguinofemoral nodes | GOG 37 (Level I) | Adjuvant pelvic + groin RT mandatory |
| Extracapsular spread (ECS) | Multiple retrospective series | Adjuvant pelvic + groin chemoRT mandatory |
| Fixed or ulcerated groin nodes | GOG 37 subset | Adjuvant pelvic + groin RT |
| Inadequate dissection (<8-10 nodes removed) | Expert consensus | Adjuvant RT to compensate |
| 1 macrometastasis (≥5 mm) | Retrospective data | Consider adjuvant RT - controversial |
| 1 small metastasis (<5 mm), no ECS | Limited evidence | RT may be omitted; individualize |
| Factor | Impact on Pelvic Node Risk | Impact on Survival |
|---|---|---|
| Number of positive inguinofemoral nodes | ≥3 nodes: 30-40% pelvic LN risk | Proportional reduction |
| Size of nodal metastasis | Macrometastasis >>Micrometastasis | Major determinant |
| Extracapsular spread (ECS) | Markedly increases pelvic involvement | Most important negative predictor |
| Proportion of node replaced by tumor | Higher replacement = worse prognosis | Significant |
| Bilateral vs. unilateral involvement | Bilateral = higher stage | Survival reduced |
| Depth of stromal invasion | >5 mm = 34% node positivity | Risk factor |
| Tumor size | >4 cm = markedly higher risk | Correlates with nodal positivity |
| Complication | IFL Rate | PLND (additional) | SLN Rate |
|---|---|---|---|
| Lymphedema (chronic) | 25-40% | Significantly higher | 8-10% |
| Wound breakdown/infection | 20-40% | Additional risk | 5-10% |
| Lymphocyst formation | 15-20% | Added risk | 5-8% |
| Deep vein thrombosis | 5-10% | Higher | 2-5% |
| Bowel injury | Rare | 2-5% | Near zero |
| Nerve injury (femoral) | 2-5% | Higher | Rare |
| Hernia | Rare | 3-5% | None |
| Perioperative mortality | 0.5-1% | Higher in elderly/comorbid | Minimal |
Advanced Vulvar Cancer (T3 / Fixed/Unresectable nodes)
│
▼
Primary Chemoradiation:
- 45 Gy to primary tumor, groins, and pelvis
- Concurrent weekly cisplatin 30-40 mg/m²
- IMRT preferred (generous volumes)
│
▼
Re-evaluate at 6-8 weeks (CT/MRI/PET-CT)
│
┌───────┴──────────────┐
│ │
▼ ▼
Resectable residual Complete response
│ (clinical/pathologic)
▼ │
Resect primary + ▼
Limited groin node Observation
debulking (NOT full (biopsy if needed)
lymphadenectomy)
Recurrence with pelvic LN involvement
│
▼
Multiple pelvic nodes / distant metastasis:
→ Systemic therapy ± selective EBRT (if feasible)
→ Palliative/best supportive care
│
Isolated pelvic LN recurrence (previously irradiated):
→ Resection + systemic therapy (select cases)
│
Isolated pelvic LN recurrence (no prior RT):
→ EBRT ± concurrent chemotherapy
Vulvar Cancer - Decision Point for Pelvic Node Management
═══════════════════════════════════════════════════════════
ALL PATIENTS
│
┌────────────────┼────────────────┐
│ │ │
▼ ▼ ▼
EARLY STAGE LOCALLY ADVANCED RECURRENT
(I-II, N0) (III-IVA) DISEASE
│ │ │
▼ ▼ ▼
SLN biopsy or Primary CRT See recurrence
IFL ± SLN (groin+pelvis algorithm
│ in field) above
│
├── ALL NODES NEGATIVE
│ │
│ ▼
│ NO pelvic
│ treatment needed
│
└── NODES POSITIVE (IFL done)
│
┌───────┴────────┐
│ │
▼ ▼
1 node+, no ECS ≥2 nodes+ OR ECS
(<5 mm) OR ≥1 large node
│ │
▼ ▼
Individualize ADJUVANT CHEMORADIATION
(RT may not GROIN + PELVIS
be needed) (45-50 Gy + cisplatin)
│
▼
┌──────────────────────┐
│ Is there BULKY │
│ PELVIC NODE on │
│ pre-RT imaging? │
└────────┬─────────────┘
│
┌─────────┴─────────┐
│ │
▼ ▼
YES: Bulky NO: Microscopic
pelvic node pelvic risk only
│ │
▼ ▼
EXTRAPERITONEAL Pelvis included
PELVIC NODE in RT field
DEBULKING (no surgery)
(limited PLND)
THEN RT
│
▼
THIS IS THE ONLY CURRENT
SURGICAL INDICATION FOR PLND
| # | Key Point |
|---|---|
| 1 | Routine pelvic lymphadenectomy is obsolete - abandoned based on GOG 37 evidence |
| 2 | Pelvic LN metastasis is Stage IVB (FIGO 2021) - distant metastasis, very poor prognosis |
| 3 | PLND is now only indicated for debulking macroscopic pelvic nodes before adjuvant RT |
| 4 | For groin node-positive disease, adjuvant RT to pelvis + groins is superior to PLND |
| 5 | GOG 37 showed 6-yr OS 51% (RT) vs. 29% (PLND) in groin node-positive patients |
| 6 | SLN biopsy has replaced IFL in eligible patients (unifocal, <4 cm, N0 clinically) |
| 7 | GROINSS-V II confirms: RT = IFL for micrometastases; IFL superior for macrometastases |
| 8 | Adjuvant chemoRT indications: ≥2 positive nodes, extracapsular spread, fixed nodes |
| 9 | Groin recurrence is fatal in >90% of cases - the most feared outcome in vulvar cancer |
| 10 | ICG is an emerging SLN tracer alongside Tc-99m; blue dye is being phased out at many centers |