Thermochemotherapy in patients with extremity high-risk soft tissue sarcomas (HR-STS).

PURPOSE

We report data from phase II trials examining the efficacy of multimodality treatment with neoadjuvant chemotherapy, hyperthermia, surgery, radiation and postoperative thermochemotherapy in adult patients with high-risk sarcomas of the extremities.

PATIENTS AND METHODS

From 1991 to 2001 47 patients with high risk soft tissue sarcoma of the extremities were prospectively treated in two clinical trials with a treatment plan of four cycles of etoposide, ifosfamide and doxorubicin combined with regional hyperthermia followed by surgery, radiation and adjuvant chemotherapy.

RESULTS

Objective response rate assessable in 39 patients was 21% (one complete and seven partial responses). A favourable histological response (>75% tumour necrosis) was observed in 34% of the 35 evaluable patients who had surgical resection. Median overall survival (OS) was 105 months. The five-year probability of local failure-free survival (LFFS), distant disease-free survival (DDFS), event-free survival (EFS) and OS were 48%, 55%, 35% and 57%, respectively. There were no significant differences between responders and non-responders of minimum temperatures (Tmin) and time-averaged temperatures achieved in 50% (T(50)) and 90% (T(90)) at all measured tumour sites. Response to this neoadjuvant regimen predicted for prolonged LFFS (p = 0.0123), but not for OS (p = 0.2). Limb preservation was achieved in 37 patients (79%) and did not result in inferior DDFS (52% versus 50%) or OS (61% versus 50%) at five years (p = 0.8) in comparison to patients who underwent amputation.

CONCLUSION

Response to combined modality treatment with RHT and neoadjuvant chemotherapy was predictive for an improved LFFS and led to limb preservation in 79% of patients with extremity sarcomas.