Study	Reason for exclusion
Adell 2002	(1) Participant population consisted mainly of adults (2) No outcomes relevant to this review were assessed (3) Participants who did not receive chemotherapy in the month before vaccination were included in the chemotherapy group
Ahmed 1996	Review on efficacy of influenza vaccine
Allison 1977	Details pertaining to chemotherapy were not adequately specified; therefore, not clear whether participants who received vaccine were receiving chemotherapy or had received chemotherapy during the month before vaccination. Not clear how treatment group was defined
Arola 1995	No vaccines administered
Barnes 2001	Review on infections after bone marrow transplantation
Bektas 2007	Lack of a control group
Borella 1971	Not clear how outcome of influenza‐like illness was assessed; not specified by whom symptoms of influenza‐like illness were scored and how many symptoms were necessary for diagnosis of influenza‐like illness; therefore many viral illnesses were included. Impossible to specify the treatment and control groups
Brown 1982	(1) Presented as summary; insufficient information provided on characteristics of participants and controls (2) Control group data were obtained from another trial
Brown 1983	Review on influenza and pneumococcal vaccination in cancer patients
Brunell 1977	(1) Insufficient information provided on methodology, characteristics of participants and controls (2) Results are not presented
Brydak 1997	42/49 participants had already finished chemotherapy treatment (6 months to 3 years)
Brydak 1998	Only 2 subjects were receiving chemotherapy at time of study
Engelhard 1993	(1) Lack of a control group (2) Participants did not receive chemotherapy or radiotherapy in the month before vaccination (3) Adults included in study population, results of children not presented separately
Esposito 2009	Commentary on influenza vaccination in children with cancer receiving chemotherapy
Feery 1979	Control group data were obtained from another trial
Ganz 1978	Adult study population
Gribabis 1994	Adult study population
Gross 1985	Review of influenza vaccine in cancer patients receiving chemotherapy
Hayden 2000	Review on treatment and prophylaxis of influenza
Hicks 2003	Review on various viral infections in cancer patients
Jackowska 1996	Same patient population as in Brydak 1997
Kandel 2005	Review on prevention and treatment of influenza
Kempe 1989	Participants were not vaccinated
Louie 2006	Only 3 children with leukaemia/blood dyscrasia in study population; not stated whether they were vaccinated
Mayr 1974	Adult study population
McIntosh 2003	Review on vaccines for children
Modlin 1977	Children with malignancies were not included in the study
Morris 1990	Review on viral infections in children with cancer
Pauksen 2000	Adult study population
Reilly 2010	Lack of a control group
Ridgway 1993	Review on eight vaccines (including influenza vaccine) in children with cancer
Schafer 1979	(1) Adult study population (2) Not clear whether participants received chemotherapy in the month before vaccination
Smithson 1978	Control group data were obtained from another trial
Somani 1995	Review on re‐immunisation with various vaccines after bone marrow transplantation
Stiver 1978	Adult study population
Sumaya 1977	Control group data were obtained from other trials
Sumaya 1982	Lack of a control group
Uchaikin 1999	Participants did not receive chemotherapy in the month before vaccination
Yamada 1982	6/8 participants had already finished chemotherapy