Nunzio Antonio Cacciola

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1. Introduction Plastic has found wide use, replacing wood, paper, glass, and metal because of its characteristics: It is easy to work with, cheap, lightweight, and impermeable to water; has low thermal conductivity; and is an electrical insulator [1,2]. Its production has grown rapidly, from about 1.7 tons per year in the early 1950s to more than 350 million tons annually in the 21st century [3].

2. Materials and Methods 2.1. Canine Mammary Tissue Collection for Histology Forty-five tissues were harvested from spontaneous CMTs, which were surgically removed in accordance with a routine treatment protocol at the Veterinary Teaching Hospital of the Department of Veterinary Medicine and Animal Production of Naples Federico II University; sampling for histologic diagnosis and treatment followed Directives 2010/63/EU.