Prognostic Models for Nonmetastatic Triple-Negative Breast Cancer Based on the Pretreatment Serum Tumor Markers with Machine Learning

Table 2

The optimal prognostic cut-off value of each tumor marker determined by X-tile.

Tumor marker	Cut-off	No. of patients N (%)
CEA/(ng/mL)	2.15	<2.15	167 (64.7)
		≥2.15	91 (35.3)
CA19-9/(U/mL)	17.30	<17.30	202 (78.3)
		≥17.30	56 (21.7)
CA125/(U/mL)	9.05	<9.05	64 (24.8)
		≥9.05	194 (75.2)
CA242/(U/mL)	8.85	<8.85	217 (84.1)
		≥8.85	41 (15.9)
CA211/(ng/mL)	1.15	<1.15	155 (60.1)
		≥1.15	103 (39.9)
CA15-3/(U/mL)	16.00	<16.00	215 (83.3)
		≥16.00	43 (16.7)

CEA: carcinoembryonic antigen; CA: cancer antigen.