TABLE 3.

Summary of included studies with statistically significant associations.

Psychological factors	Breast cancer studies	Lung cancer studies
Trauma	Jacobs and Bovasso, 2000; Lillberg et al., 2003; Schoemaker et al., 2016
Grief	Jasmin et al., 1990
Depression	Gallo et al., 2000; Jacobs and Bovasso, 2000; Montazeri et al., 2004; Ollonen et al., 2005; Hung et al., 2014	Knekt et al., 1996; Pennix et al., 1998; Goldacre et al., 2007; Hung et al., 2014; Trudel-Fitzgerald et al., 2020

All studies presented show statistically significant associations, p < 0.05. Twenty-six studies were analyzed.