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Publishers Clearing House. Publishers Clearing House (PCH) is a direct marketing company that markets merchandise and magazine subscriptions with sweepstakes, and prize-based games. Publishers Clearing House was founded in 1953 by Harold Mertz to replace door-to-door magazine subscription sales by a single vendor offering multiple subscriptions by mail.
Procalcitonin (PCT) is a peptide precursor of the hormone calcitonin, the latter being involved with calcium homeostasis. It is composed of 116 amino acids and is produced by parafollicular cells (C cells) of the thyroid and by the neuroendocrine cells of the lung and the intestine.