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Actuarial Kaplan-Meier survival curves for 89 patients with bone metastases from breast cancer stratified by serum CA 15-3 level (median 17.6 for lowest quartile (< 32.5 kIE/L) versus 14.7 months for intermediate levels and 6.9 months for highest quartile (> 208 kIE/L), P = 0.002), log-rank test.
