Collaboration between research groups

Different research groups conducting clinical trials may decide to collaborate in a large national or international trial or in an extended programme of research. Collaboration is highly desirable to achieve rapid rates of intake into trials investigating uncommon cancers, trials requiring large numbers of patients, or if there are reasons why accrual is likely to be slow or difficult. International collaboration has been highly productive, for example, in trials of advanced bladder cancer, osteosarcoma, glioma, stomach cancer, gynaecological cancers, testicular cancer, and lymphoma. Forms of collaboration are indicated in Box 7.10.

In practice, collaboration may take several forms varying in the level of collaboration involved.

♦ Separate groups agree to run parallel protocols. These protocols may be prepared individually by each group, but are designed to answer the same questions and are therefore similar (and maybe identical), although adhering to the style and practices of the separate groups. Each group is responsible for its own data collection and

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