Informed consent and research with stored biological samples.

OBJECTIVE: To report practical experience in obtaining consent for a retrospective study conducted at the Brazilian National Cancer Institute (INCA). The study involved review of medical records and analysis of paraffin blocks of patients surgically treated for colon cancer between 2000 and 2004. Attempts to obtain informed consent were made in compliance with the resolution 196/96 of the Brazilian National Health Council and determination of INCA Research Ethics Committee. METHODS: At scheduled appointments, we could approach only four patients for consent during three months. After attempting contact by phone, an information sheet summarizing the content of informed consent, two copies of the consent form and a prepaid return envelope were then mailed to the patients. RESULTS: Of the 155 consent forms mailed, 115 were returned (74%). Of these, 111 patients gave consent to participate in the study, one refused consent, and we were informed that three patients had died. The time course of return of these forms ranged from 2 to 89 days (median: 10 days). Attempts to contact patients by phone were successful in 60 out of 160 cases (37.5%). The Research Ethics Committee waived the requirement of consent for those who had died or not responded. Overall mailing cost was R$ 1,004.40. CONCLUSION: Obtaining consent from patients by phone and mail for a retrospective clinical study is feasible. Most patients responded to contact and gave consent to participate. However, the process entails costs and risks that cannot be overlooked.

Termo de consentimento e análise de material biológico armazenado / Consent procedures and research on stored biological samples

OBJETIVO: Relatar uma experiência envolvendo a obtenção de termo de consentimento livre e esclarecido (TCLE) para estudo retrospectivo realizado no Instituto Nacional de Câncer (INCA). O mesmo envolvia a revisão de prontuários e a análise de blocos de parafina de pacientes com câncer de cólon operados entre 2000 e 2004. Respeitando a resolução 196/96 do Conselho Nacional de Saúde e a determinação do Comitê de Ética em Pesquisa (CEP) do INCA, buscou-se obter o consentimento informado. MÉTODOS: Nas consultas agendadas, conseguiu-se aplicar o termo a apenas quatro pacientes, durante três meses. Foram enviadas então pelo correio duas cópias do TCLE, juntamente com um sumário e um envelope selado para o re-envio aos pesquisadores. Antes da postagem, tentou-se contato telefônico. RESULTADOS: Obteve-se retorno de 115 dos 155 TCLE enviados (74 por cento). Dentre as respostas recebidas, 111 consentiram participar do estudo, houve uma recusa e foi informado que três pacientes haviam falecido. O tempo entre o envio da correspondência e o recebimento da resposta variou entre 2 e 89 dias (mediana: 10 dias). Houve sucesso no contato telefônico com 60 dos 160 pacientes (37,5 por cento). Para os que já haviam falecido e para os que não retornaram o TCLE, o CEP aprovou a dispensa do mesmo. O custo final do envio dos envelopes foi de R$1.004,40. CONCLUSÃO: A busca de comunicação telefônica e postal com pacientes para a obtenção de TCLE de estudo clínico retrospectivo é factível. A maioria respondeu ao contato e consentiu participar. Há, porém, custos e riscos agregados que não podem ser desprezados.

OBJECTIVE: To present practical experience in obtaining consent form (CF) for a study performed at the "Instituto Nacional de Câncer" involving research on stored biologic samples from patients operated for colon cancer from 2000 to 2004. According to the Brazilian National Health Council resolution nº196/96, researchers must make every effort to obtain consent from patients participating in clinical studies, which is reinforced by the Research Ethics Committee (REC). METHODS: After attempting phone contact, two copies and a synopsis of the CF were posted to each patient, with a stampedreturn envelope. RESULTS: 160 patients were included in the study. The attempt of phone contact was successful with 60 of them (37.5 percent). The consent form was mailed to 155 patients: 115 posted it back (74 percent) Three patients had already passed away, 111 accepted and one refused to participate. The median time between posting and receiving the CF back was 10 days (interval: 2-89). The REC waived the requirement of CF for those who died and for the ones who did not reply. The final cost for sending the CF was R$1,004.40. CONCLUSION: Obtaining consent by postal and phone communication for retrospective genetic research with stored tissue samples is feasible. Most responded to contact and consented to participate, but there were costs and risks that cannot be neglected.