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Poster Display session 1

2504 - Inadequacy of current definition and staging system of Medication-Related Osteonecrosis of Jaw (MRONJ) released by AAOMS : a Computed Tomography study in 151 cancer and myeloma patients


28 Sep 2019


Poster Display session 1


Supportive Care and Symptom Management

Tumour Site

Multiple Myeloma


Vittorio Fusco


Annals of Oncology (2019) 30 (suppl_5): v718-v746. 10.1093/annonc/mdz265


V. Fusco1, A. Fasciolo2, A. Gambino3, M. Cabras3, F. Erovigni3, C. Bianchi3, L. Benzi4, I. De Martino1, F. Monaco5, M. ROSSI1, G. Numico1, S. Carossa3

Author affiliations

  • 1 Oncology Unit, Azienda Ospedaliera SS. Antonio e Biagio e Cesare Arrigo, 15121 - Alessandria/IT
  • 2 Maxillofacial Unit, Azienda Ospedaliera SS. Antonio e Biagio e Cesare Arrigo, 15121 - Alessandria/IT
  • 3 Dental School, Azienda Ospedaliera Città della Salute, 10126 - Torino/IT
  • 4 Radiology Dept, Azienda Ospedaliera SS. Antonio e Biagio e Cesare Arrigo, 15121 - Alessandria/IT
  • 5 Hematology Unit, Azienda Ospedaliera SS. Antonio e Biagio e Cesare Arrigo, 15121 - Alessandria/IT


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Abstract 2504


The most largely used definition (and staging system) of Osteonecrosis of the Jaws (ONJ), more recently named Medication-Releated ONJ (MRONJ), was released by an American Association Oral Maxillofacial Surgery (AAOMS) task force. It is based on clinical features (mainly bone exposure for at least 8 weeks, or – only after 2014 - bone to be probed through a fistula) but the AAOMS is questioned by many experts. A team supported by the Italian Societies of Oral Medicine (SIPMO) and Maxillofacial Surgery (SICMF) suggested adoption of imaging tools (mainly Computed Tomography, CT) together with clinical features (Bedogni et al, Oral Disease 2012) to reach diagnosis (also in suspected cases without bone exposure, so called “Stage 0” according to AAOMS) and to evaluate real disease extension.


To compare the stage of MRONJ cases at the first observation time in patients receiving antiresorptive therapy (bisphosphonates, denosumab), according to two different staging systems, we reviewed charts and CT scans of cancer and myeloma patients with signs of ONJ.


We collected data of 151 MRONJ patients in two referral centers. Disease: 73 breast cancer; 28 myeloma; 26 prostate cancer; 24 other solid tumors. The AAOMS stage was 0/I/II/III respectively in 34/38/52/27 observed cases. The SIPMO-SICMF stage was I (involvement of only alveolar bone at CT scan)/ II (extended to extralveolar bone) /III (complicated case) respectively in 48/76/27 cases. The 34 AAOMS “stage 0” cases (signs/symptoms without bone exposure) were reclassified as stage I (14) or II (20) or III (0) respectively, according to the Italian staging system.


In cancer and myeloma patients the AAOMS definition and staging system appear inadequate, potentially exposing patients to delayed diagnosis and treatment. The diagnosis and staging should be based not only on clinical data but also on the findings of the maxillofacial region CT scan, since the CT offers larger information about extent and severity of the disease.

Clinical trial identification

Editorial acknowledgement

Legal entity responsible for the study

The authors.


Has not received any funding.


All authors have declared no conflicts of interest.

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