Abstract 1793
Background
Changes to the AJCC melanoma staging system eighth edition (AJCC-8) should be independently validated to assess its prognostic performance compared with the seventh edition (AJCC-7) in accurately staging melanoma.
Methods
We used the SEER-18 registry from 2010 to 2015 to extract patient-, tumour-related and survival data. Kaplan-Meier analysis was used for overall survival (OS) and cancer-specific survival (CSS) for AJCC-7 and AJCC-8. Cumulative hazard functions were computed using Nelson-Aalen function.
Results
Of 126,408 individuals, 59,989 (47%) and 60,411 (48%) had available data for pathological and clinical stage OS analysis, respectively. The 12-month OS for AJCC-7 among pathologically staged patients were: stage IA 99%, stage IB 99%, stage IIA 96%, stage IIB 94%, stage IIC 87%, stage IIIA 98%, stage IIIB 94%, stage IIIC 82% and stage IV 41%. The 12-month OS for AJCC-8 patients was similar to AJCC-7 but was 88% for stage IIIC and 65% for stage IIID. The 12-month risk of dying for pathological stage IIIC was 13% compared to 41% for pathological stage IIID (p < 0.001). Stage IV individuals with an elevated LDH had worse OS and CSS at all other measured time-points up to 60 months compared to those with a normal LDH. Stage IV individuals with brain metastases (M1d) also had worse OS and CSS at all other measured time-points up to 60 months compared to other stage IV subgroups.
Conclusions
The discriminatory ability of the AJCC-7 and AJCC-8 melanoma staging system appear comparable. Changes in AJCC-8 identifies individuals with a poorer prognostic within new subgroups. These include the subgroups of stage IIID and M1d within stage IV individuals, and the addition of elevated LDH as a prognostic marker in stage IV disease. However, advanced T stage, node-negative tumours experienced worse survival compared with earlier T stage, node-positive tumours requiring further research to evaluate the underlying biology of these tumour subgroups.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
All authors have declared no conflicts of interest.
Resources from the same session
4310 - PULSE : A Single Arm Trial Assessing The Activity and Safety of Avelumab Immunotherapy Maintenance among Patients With Locally Advanced or Metastatic Squamous Cell Penile Carcinoma (mSCPC).
Presenter: Noemie Gassian
Session: Poster Display session 3
Resources:
Abstract
5056 - Phase 2 study of 2 dosing regimens of cemiplimab, a human monoclonal anti–PD-1, in metastatic cutaneous squamous cell carcinoma (mCSCC)
Presenter: Danny Rischin
Session: Poster Display session 3
Resources:
Abstract
5710 - Avelumab for advanced Merkel cell carcinoma in the Netherlands; a nationwide survey
Presenter: Sonja Levy
Session: Poster Display session 3
Resources:
Abstract
3152 - Health-related quality of life in patients with metastatic Merkel cell carcinoma receiving second-line or later avelumab treatment: 36-month follow-up data
Presenter: Sandra D'Angelo
Session: Poster Display session 3
Resources:
Abstract
5715 - A Phase 2, Randomized Study of Nivolumab (NIVO) and Ipilimumab (IPI) versus NIVO, IPI and Stereotactic Body Radiation Therapy (SBRT) for Metastatic Merkel Cell Carcinoma (MCC, NCT03071406) – a preliminary report.
Presenter: Sungjune Kim
Session: Poster Display session 3
Resources:
Abstract
2854 - Real-world impact of immune checkpoint inhibitors in metastatic uveal melanoma
Presenter: Kalijn Bol
Session: Poster Display session 3
Resources:
Abstract
2928 - Immune checkpoint inhibitors in a cohort of 206 metastatic uveal melanomas patients
Presenter: Mathilde Saint-Ghislain
Session: Poster Display session 3
Resources:
Abstract
1235 - Incidence and survival of Uveal Melanoma occurring as single cancer versus its occurrence as a first or second primary neoplasm
Presenter: Ahmad Alfaar
Session: Poster Display session 3
Resources:
Abstract
3615 - Validation of a Clinicopathological and Gene Expression Profile (CP-GEP) Model for Sentinel Lymph Node Metastasis in Primary Cutaneous Melanoma
Presenter: Evalyn Mulder
Session: Poster Display session 3
Resources:
Abstract
4278 - Clinical factors and overall survival (OS) associated with patterns of metastases (mets) in melanoma patients (pts).
Presenter: Ines Pires da Silva
Session: Poster Display session 3
Resources:
Abstract