THE EFFECT OF AGE ON OUTCOME OF SYNOVIAL SARCOMA PATIENTS A DUTCH POPULATION BASED STUDY Myrella Vlenterie, SEJ Kaal, VKY Ho, R Vlenterie, WTA van der Graaf Medical Oncology, Radboud University Medical Centre, Nijmegen
Literature
Research question Is age an independent prognostic factor for overall and relative survival in synovial sarcoma patients?
Research question Is age an independent prognostic factor for overall and relative survival in synovial sarcoma patients? Do treatment modalities explain the differences between variant age groups?
Materials & Methods The Netherlands Cancer Registry: >95% coverage Information at diagnosis Tumour and patient characteristics, diagnostics and therapy Sources: Dutch pathology network (PALGA) & hospital records
Materials & Methods The Netherlands Cancer Registry: >95% coverage Information at diagnosis Tumour and patient characteristics, diagnostics and therapy Sources: Dutch pathology network (PALGA) & hospital records Cancer care in the Netherlands Sarcoma care centralised in recent years
Materials & Methods The Netherlands Cancer Registry: >95% coverage Information at diagnosis Tumour and patient characteristics, diagnostics and therapy Sources: Dutch pathology network (PALGA) & hospital records Cancer care in the Netherlands Sarcoma care centralised in recent years Statistics: Kaplan Meier for Overall survival (OS) Relative survival (RS) Univariate analyses Multivariate Cox regression analyses
Age groups Children < 18years Adults 35-64years AYAs 18-34years Elderly ≥65years
Patient cohort Total: 586 patients
Overall survival: stage at diagnosis No metastasis 5yr OS: 64±2% Unknown stage Metastases median survival: 11±1months Median follow up: 42 months (range months) Cumulative survival Survival time (months)
Localised disease
Patient characteristics Variablen = 438(100%) Age o <18 years o years o years o ≥65 years (12%) (33%) (44%) (12%) Sex o Male o Female (54%) (46%) Histology o Monophasic o Biphasic o Not specified (22%) (56%) Hospital of surgery o General hospital o Academic hospital o Unknown (25%) (45%) (31%)
Patient characteristics Variablen = 438(100%) Site of origin o Extremities o Head and neck o Trunk o Other (67%) (8%) (18%) (7%) Therapy o Surgery alone o Surgery + RT (+CT) o Surgery + CT o No surgery (35%) (47%) (9%) (10%) Resection status o R0 o R1 / R2 o R status unknown (31%) (12%) (58%)
Overall survival: age groups 5yr OS: 91±4% Children 5yr OS: 72±4% AYAs 5yr OS: 57±4% Adults 5yr OS: 43±7% Elderly Cumulative survival Survival time (months)
Relative survival: age groups 5yr OS: 91% 5yr RS: 91%Children 5yr OS: 72% 5yr RS: 72%AYAs 5yr OS: 57% 5yr RS: 58%Adults 5yr OS: 43% 5yr RS: 53%Elderly RS: Corrected for age, sex and year
Age as a continous variable Age (years) Survival time (months)
Cox regression: Univariate analyses
p < 0.10
Cox regression: Univariate analyses p < 0.10
Cox regression: Univariate analyses p < 0.10
Treatment modalities *Chi-square: p<0.05 * 43 patients received no surgery left out of multivariate analysis
Cox regression: Multivariate analysis
Take home messages 1.Age at diagnosis is an independent prognostic factor for overall and relative survival 2.Survival differences can not be explained by treatment modalities
Future research Further research in tumor biology is necessary to explain the survival differences