randomized controlled trial 

Research that uses chance to assign participants into study groups.

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randomization

A way to use chance to place study participants into different study treatment groups.

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questionnaire

A list of questions for study participants to answer as part of the study.

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Quality of Life (QOL)

How someone feels and functions day to day.

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purpose

What the study is testing.

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pseudonymize

Replace personal details with a code so that data are protected.

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proxy

A person who is legally allowed to make research decisions for someone else.

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protocol

A complete description of the research plan and procedures.

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disease-free survival

The length of time after treatment that a person lives without the illness coming back.

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progression-free survival

The length of time without a person’s illness getting worse.

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