Molecular update: Stage I includes POLE mutations (favorable) and p53 mutations (unfavorable).
Guidelines & Evidence
Clinical Details
Section 1
When to Use
Primary Clinical Uses
Surgical and pathological staging of endometrial carcinoma and carcinosarcoma
Directing postoperative adjuvant treatment (radiation vs chemotherapy)
The 2023 Molecular Revolution
The 2023 update was the most radical change in history. It officially incorporated molecular classification (POLEmut, MMRd, NSMP, p53abn) into the staging system. A p53-abnormal tumor is now heavily upstaged regardless of myometrial invasion, whereas a POLE-mutated tumor may be downstaged due to exceptional prognosis.
Section 2
Formula & Logic
Stage I — Confined to Uterus (Ovary involvement nuanced)
IA1
Non-aggressive histology, confined to endometrium/polyp
If molecular profiling is done, append "m" to the stage (e.g., IAm).
Any p53abn tumor with any myometrial invasion is automatically staged as IICm (high risk), overriding its anatomical Stage I boundaries.
A stage II (cervical stroma) tumor with POLE mutation is distinctly down-staged biologically due to nearly zero recurrence risk.
Section 4
Next Steps
Clinical Action
01
Determine initial anatomical stage from TAH-BSO pathology.
02
Perform IHC testing for MMR proteins and p53, plus POLE sequencing if available.
03
Apply upstaging/downstaging rules based on 2023 FIGO molecular integration.
04
Route patient into PORTEC-guided therapeutic pathways (e.g., observation vs vaginal brachytherapy vs pelvic EBRT vs systemic chemo).
Section 5
Evidence Appraisal
2023 Landmark Release
FIGO staging of endometrial cancer: 2023.
Berek JS et al. • Int J Gynaecol Obstet.. 2023;The defining document fundamentally restructuring staging to align structural pathology with genomic reality.
Section 6
Literature
TCGA Influence
The 2023 system was heavily catalyzed by The Cancer Genome Atlas (TCGA) Research Network, which in 2013 entirely redefined endometrial cancer biology by proving that distinct molecular subgroups exist and wildly outpredict traditional anatomical grade and stage.
