Table 1. Flowchart of (A) the development data set and (B) the validation data set.

	Development data set	Validation data set
Total number of patients	2182	324
Lost to follow-up within the 90 first days	72	16
Missing data for albumin	49	51
Missing data for the number of metastatic site	0	83
Missing data for LDH	337	76
Assessable patients for both models	1760	172

Abbreviation: LDH=lactate dehydrogenase.