Recurrences following primary osteosarcoma in adolescents and adults previously treated with chemotherapy
Introduction
With the advent of aggressive chemotherapy, the long-term survival of patients with high-grade osteosarcoma has improved considerably 1, 2, 3, 4, 5. However, despite the success of combined surgical and chemotherapeutic modalities, 30–40% of patients develop lung metastases or local recurrences. Studies on the management of patients who relapse are very limited in number 6, 7, 8 and mainly concern patients with pulmonary metastases 9, 10, 11, 12, 13, 14, 15, 16. An aggressive pulmonary metastasectomy is at present an accepted treatment strategy, with good results in patients with metastases confined to the lung 9, 10, 11, 12, 13, 14, 15, 16, whereas the value of second-line chemotherapy treatment 7, 9, 10, 14, 15 and the best treatment strategy for those patients with recurrences other than in the lung 8, 7 are not well defined. Nevertheless, since the introduction of effective chemotherapy for osteosarcoma 17, 18, 19, a more aggressive multidisciplinary approach to treat patients with metastatic disease has evolved, and the use of second-line chemotherapy treatment with resection of the recurrence is quite common 6, 7, 9, 10, 11, 12, 14, 15.
We report on a retrospective analysis of 33 adolescent and adult patients who developed metastases or local recurrences from extremity-localised high-grade osteosarcomas. We examine the pattern of recurrence, various treatment methods and results, with particular emphasis on the prognostic impact of previous treatment type, salvage surgery (‘metastasectomy’) and second-line chemotherapy.
Section snippets
Patients
From November 1979 to November 1998, 81 patients with histologically-proven high-grade osteosarcoma of the extremities were treated at the Oncology Unit of la Timone Adults University Hospital. All were initially free of metastatic disease. There were 51 males and 30 females.
At initial presentation, the absence of metastases at diagnosis was routinely ascertained by bone scans for all patients, conventional lung tomography prior to 1983, and by computed tomography (CT) scans of the chest
Patterns of recurrence
Patients' characteristics and sites of recurrence are presented in Table 1. 33 patients, 26 males and 7 females, were entered into this study. 7 patients (37%) relapsed after being given period 1 chemotherapy, 8 (50%) relapsed after period 2 (SO83) chemotherapy, and 18 (39%) after completing the T-10-derived protocol; this was not significantly different (P>0.05). The median age at the time of diagnosis of the primary tumours was 20 years (range 12–55 years). The median intervals from the
Discussion
Before the use of adjuvant chemotherapy, lung metastases appeared in more than 90% of patients 5–8 months after surgical treatment for primary osteosarcoma 15, 19, 25. With intensive chemotherapy, the long-term disease-free survival rate for localised high-grade osteosarcoma improved from less than 20% to the 55–75% range 3, 5, 26, 27, 28, 29. However, 30–40% of patients still relapse, most often with pulmonary metastases, but after a longer median disease-free interval of 10–17 months 15, 25,
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