Patients with the involvement of lymph nodes and patients with overall disease stage III had worse LRC, DFS, DSS and CFS in comparison with patients with N0 and overall stage I or II and patients with Hb below 120 g/l had worse LRC, DFS, DSS and OS in comparison with patients with Hb 120 g/l or higher. Here, GSTM1 is linked to myalgic encephalomeyelitis/chronic fatigue syndrome.