Abstract
e18107 Background: Bone is a common site of metastatic involvement in patients (pts) with LC. Bony metastases (mets) are often associated with SREs (spinal cord compression [SCC], pathologic fracture [PF], surgery to bone [SB], radiotherapy to bone [RT]). Skeletal complications cause significant morbidity and mortality. Current estimates of SRE risk come principally from randomized clinical trials. Information from routine clinical practice is limited. Methods: Using the tumor registry and electronic data stores at a large U.S. Midwest healthcare system that serves approximately 800,000 persons, we retrospectively identified all pts aged ≥18 yrs with primary LC and newly diagnosed bone mets between 1/1/95 and 12/31/09. Electronic medical records were reviewed by trained abstractors for evidence of SREs between date of bone mets diagnosis and death, loss to follow-up, or end of study. Cumulative incidence of SREs was estimated in the presence of competing risk of death. Results: We identified a total of 272 pts with primary LC and newly diagnosed bone mets; 66 pts had evidence of SREs at initial diagnosis of bone mets and were excluded from the analyses. Among the remaining 206 pts, mean (SD) age was 65.7 yrs (10.5 yrs) and 66% were male; 47% were Caucasian and 50% were African-American. Median duration of follow-up after diagnosis of bone mets was 3.0 months (mos). At 6 mos, cumulative incidence of SREs was 45.6% (SCC, 6.9%; PF, 20.6%; SCC and/or PF, 25.0%; SB, 4.1%; RT, 34.7%) (Table). Corresponding figures at 12 mos were 50.8% (SCC, 6.9%; PF, 24.1%; SCC and/or PF, 28.3%; SB, 4.1%; RT, 39.8%). Relatively few pts (17.5%) received intravenous bisphosphonates prior to SRE. Conclusions: Pts with LC in routine clinical practice are at high risk of SREs following initial diagnosis of bone mets. [Table: see text]
Published Version
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