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ePoster
EP364 Prognostic value of ddPCR HPV in lymph nodes of early cervical cancer
  1. R Montero Macías1,
  2. D Veyer2,
  3. M Mandavit3,
  4. M Wack4,
  5. B Rance4,
  6. H Bonsang-Kitzis1,5,
  7. M Deloménie1,5,
  8. A-S Bats1,5,
  9. C Ngo1,5,
  10. V Balaya1,5,
  11. M Koual1,5,
  12. H-T Nguyen-Xuan1,5,
  13. M-A Lefrère-Belda6,
  14. V Taly7,8,
  15. F Lecuru1,5,
  16. P Mathevet9 and
  17. H Péré2,3
  1. 1Gynecologic and Breast Oncologic Surgery
  2. 2Virology Laboratory
  3. 3INSERM U970, PARCC
  4. 4Department of Medical Informatics, Biostatistics and Public Health, European Georges Pompidou Hospital
  5. 5Paris Descartes University, Sorbonne Paris Cité
  6. 6Anatomo-Pathology Department, European Georges Pompidou Hospital
  7. 7INSERM UMR-S1147, eDIAG platform, CNRS SNC5014, Paris Descartes University, Sorbonne Paris Cité
  8. 8National League Against Cancer, Paris, France
  9. 9Department of Gynaecology, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland

Abstract

Introduction/Background In early stages (Ia to IIa1) of cervical cancer (CC), nodal status is the cornerstone of treatment algorithm and patients with nodal metastasis (N+) present worse survival.

However, 10–15% of patients without nodal metastasis (N0) present the same survival to patients N+. No clinical, imaging or pathological risk-factor is today effective to select these patients for different management.

In HPV-related cancers, like CC, HPV DNA could be assimilated to tumoral DNA and represent an interesting marker of node metastasis.

In this study, we evaluate the presence of tumoral HPV DNA in pelvic lymph nodes (PLN) by new ultrasensitive droplet-based digital polymerase chain reaction (ddPCR) to explore it as a new additional biomarker to classify early stages of CC.

Methodology This study was conducted on 30 patients from Senticol prospective trials. Formalin-fixed paraffin (FFPE) embedded tumours and associated pelvic lymph nodes samples were available for only 25 patients in our institution.

In HPV16-positive tumour patients (n=18; 3 patients were N+ and 15 N0), we performed the specific HPV16 ddPCR in associated pelvic lymph node samples after a manual DNA extraction. Simultaneously, albumin was detected as internal control.

Results Unfortunately, 22.2% of PLN were not interpretable (NI) with a very low level of albumin suggesting that no sufficient amount of DNA was extracted for HPV16 tumoral DNA interpretation. It could be explained by DNA destruction over time considering that FFPE biopsies were collected from 2005 to 2011.

Insufficient follow-up data is <6 months (2 patients).

Conclusion As expected, HPV16 tumoral DNA was detected in N+ patient PLN.

In the N0 group, 40% (2/5) of patients with HPV16-positive PLN have relapsed regarding 12,5% (1/8) relapsing patients in the group of HPV16-negative PLN.

These interesting preliminary results invite to test this new molecular biomarker in largest cohorts to evaluate its interest in early CC management.

Disclosure Nothing to disclose.

Abstract EP364 Figure 1
Abstract EP364 Figure 1

Association between HPV 16 in PLN, nodes status and recurrences

https://doi.org/10.1136/ijgc-2019-ESGO.423

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