Analysis 1.1. Comparison 1 Colchicine versus placebo, Outcome 1 Number of participants experiencing an attack.. Analysis 2.1. Comparison 2 Rilonacept versus placebo, Outcome 1 Number of participants experiencing an attack.. Analysis 3.1. Comparison 3 ImmunoGuard™ versus placebo, Outcome 1 Acute phase response.. .. .. .. Analysis 4.1. Comparison 4 Anakinra versus placebo, Outcome 1 Number of participants experiencing an attack.. Analysis 4.2. Comparison 4 Anakinra versus placebo, Outcome 2 Drug-related adverse events. .