BACKGROUND: Comorbidity has not been examined as an independent prognostic factor in soft tissue sarcoma (STS). We examined the prognostic impact of comorbidity on oncologic outcome in STS with an adjustment for possible confounding factors. METHODS: A retrospective review was performed on 349 patients who had undergone surgery for high-grade localized STS of extremity at our institute. Conditions known to alter the risk of mortality, as defined in the Charlson comorbidity index, were classified as comorbidities and 43 patients (12%) had at least one comorbidity at the time of surgery. The association of comorbidity and oncologic outcomes of local recurrence-free survival (LRFS) and disease-specific survival (DSS) were tested with adjustment for confounding factors. RESULTS: Comorbidity was associated with old age, high tumor grade, and large tumor size. The presence of comorbidity was independently associated with poor LRFS and DSS, even after adjusting for confounding factors including age and treatment variables. CONCLUSIONS: Our data suggest that the presence of comorbidity is an independent prognostic factor for extremity STS.
Adult ; Age Factors ; Comorbidity ; Confounding Factors (Epidemiology) ; Female ; Humans ; Male ; Middle Aged ; Prognosis ; Retrospective Studies ; Sarcoma/*epidemiology/surgery ; Survival Analysis

INTRODUCTIONWe describe the natural history of Asian adult soft tissue sarcomas (STSs) in the extremities and predict prognosticative factors for local recurrence, metastasis and tumour-related death.

MATERIALS AND METHODSBetween January 1999 and May 2009, 67 adult patients with first presentation STSs of extremity sites underwent surgical treatment at a single institution. The associations between patient demographics and pathological features with local recurrence, metastasis and mortality were studied using univariate and multivariate analysis.

RESULTSThe mean age of our patients was 52.4 years with most presentations occurring in the thigh. Majority of Asian STSs were high grade (61.3%) and large tumours with 81.0% being >5 cm. Stages Ia, Ib, IIa, IIb, IIc, III and IV accounted for 6.6%, 6.6%, 26.2%, 11.5%, 3.3%, 42.6% and 3.3% of presentations, respectively. Patients were followed-up for a mean period of 45.9 months. On univariate analysis, high tumour grade and advanced stage (IIc to IV) were predictive of local recurrence and metastasis. Deep lesions were more likely to recur but not metastasise or cause death. Age, sex, size, and margin positivity were not predictive for all end-points. On multivariate testing, only pathological high grade was associated adversely with local recurrence [odds ratio (OR) = 10.0, 95% CI, 1.2 to 84.9, P = 0.035], metastasis (OR = 12.7, 95% CI, 2.46 to 65.2, P = 0.002) and mortality (OR = 16.2, 95% CI, 1.95 to 135.0, P = 0.010).

CONCLUSIONSAsian adult extremity soft tissue sarcomas present late and are most commonly found in the thigh. High pathological grade is a consistent independent predictor for local failure, distant spread and tumour-related death. Our results reaffirm the current thinking that tumour biology is of primary importance in determining patient outcomes.

Adult ; Aged ; Aged, 80 and over ; Asia ; epidemiology ; Extremities ; physiopathology ; Female ; Humans ; Male ; Middle Aged ; Neoplasm Staging ; Prognosis ; Retrospective Studies ; Sarcoma ; classification ; ethnology ; mortality ; pathology ; surgery ; Soft Tissue Neoplasms ; classification ; ethnology ; mortality ; pathology ; surgery