Marcus Williams, a clinical research coordinator at Riverside Medical Center, is conducting a consent discussion for the BEACON-1 trial -- a Phase III, three-arm, double-blind study of a novel targeted therapy in advanced solid tumors. The participant, a 58-year-old retired postal worker, was referred by his oncologist after his second-line chemotherapy failed to control disease progression. He arrived with his adult daughter.
Marcus has reached the randomization section of the consent document. He reads the opening sentence aloud: "You will be randomized in a 1:1:1 ratio to one of three treatment arms." The participant's brow furrows. His daughter leans forward.
Marcus pauses. He sets the document down and takes out a blank sheet of paper. "Let me show you what this means," he says. He draws a stick figure at the top of the page and writes "You" next to it. Below the figure, he draws a circle and writes "Computer picks your group." Three arrows extend from the circle to three boxes: Group A ("New drug + your regular chemo"), Group B ("A pill that looks like the new drug but has no medicine in it + your regular chemo"), and Group C ("Your regular chemo by itself").
"There are three groups," Marcus explains, pointing to each box. "A computer assigns you to one of them -- not me, not Dr. Chen, not anyone on the research team. It is completely by chance, like drawing a number from a hat." He pauses. The participant is studying the diagram. His daughter asks, "So there is a chance he will not get the new drug at all?"
"That is right," Marcus says. "There is about a one-in-three chance of being in each group. If you are in Group B, you would receive a pill that looks identical to the study drug, but it has no active medicine in it. You would still receive your regular chemotherapy, just like everyone in the study." He pauses again, watching the participant's face.
"But nobody knows which group I am in?" the participant asks.
"Exactly. That is what 'double-blind' means -- neither you nor Dr. Chen will know which group you are in during the study. This is done so that neither of you can be influenced by knowing. But here is the important part --" Marcus points to a sentence further down in the consent document. "If there is ever a medical emergency, the study team can find out immediately which treatment you are receiving. Your safety always comes first."