Table 4. Treatment by covariate interactions in a one-stage random effects Cox regression model for OS.

Parameter	P-value for treatment by covariate interaction term
Age	0.34
Gender (male vs female)	0.88
Performance status (0 or 1 vs 2)	0.44
Disease stage (locally advanced vs metastatic)	0.18
TTP from first-line chemotherapy (during treatment vs within 3 months vs within 3–6 months)	0.04
Disease site (oesophagus vs OG junction vs stomach)	0.28
Number of progression sites (1 vs 2 or more)	0.28

Abbreviation: TTP=time to progression.