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PSA employs a 10-point grading scale, outlined below: [5] 1 - Poor - May exhibit significant defects, possess limited visual appeal, feature extensive creasing that affects all layers of the cardboard, display dirtiness, discoloration, or warping.
Collectors Universe Inc. is an American company formed in 1986, now based in Santa Ana, California, which provides third-party authentication and grading services to collectors, retail buyers and sellers of collectibles. Its authentication services focus on coins, trading cards, sports memorabilia, and autographs.
Cards are evaluated by third-party services, most often Professional Sports Authenticator (PSA), Beckett Grading Services (BGS) and Sportscard Guaranty (SGC), and given a grade on a ten-point scale based on condition. [5] The images below do not necessarily represent the individual specimen sold but are representative of the given cards.
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For example, if the most prevalent pattern/grade is 2, and the second most prevalent grade is 1, then the Gleason score is 2+1=3. If the neoplasm has only one pattern, the grade of that pattern is doubled to obtain the score. For example, if a tumor is entirely grade 1, the Gleason score would be 1+1=2.
PSA level is one of three variables on which the risk stratification is based; the others are the grade of prostate cancer (Gleason grading system) and the stage of cancer based on physical examination and imaging studies. D'Amico criteria for each risk category are: [17] Low risk: PSA < 10, Gleason score ≤ 6, AND clinical stage ≤ T2a