Hall W C, Nielsen S W, McEntee K
Bull World Health Organ. 1976;53(2-3):247-56.
Tumours of the male genital tract, excluding the testes, are relatively rare in the six major domestic animals. The most important tumours are prostate carcinoma and transmissible venereal tumour of the penis in dogs, fibropapilloma of the penis in bulls, squamous papilloma and squamous cell carcinoma in horses, and squamous papilloma in pigs. Four histological types of canine prostate carcinoma exist: alveolar papillary, acinar, organoid, and poorly differentiated. The biological behaviour of prostate carcinomas is similar to that in man, with frequent metastasis to the regional pelvic nodes, bones, and lungs. There appears to be no relationship between the common diffuse glandular hyperplasia and carcinoma in the prostate of dogs. A unique lesion of dogs is squamous metaplasia of the prostate related to estrogen-producing Sertoli cell tumours of the testis. Three different transmissible tumours of the penis occur in domestic animals. The canine venereal tumours can be transmitted only by intact tumour cells during licking and coital contact, whereas bovine fibropapillomas and porcine squamous papillomas can be transmitted by cell-free material. In cattle, the fibropapillomas are caused by the same virus that produces cutaneous papillomatosis. All three tumours are benign and usually regress spontaneously.
雄性生殖道肿瘤（不包括睾丸）在六种主要家畜中相对少见。最重要的肿瘤包括犬的前列腺癌和阴茎传染性肿瘤、公牛的阴茎纤维乳头瘤、马的鳞状乳头瘤和鳞状细胞癌，以及猪的鳞状乳头瘤。犬前列腺癌有四种组织学类型：肺泡乳头状、腺泡状、类器官型和低分化型。前列腺癌的生物学行为与人类相似，常转移至盆腔局部淋巴结、骨骼和肺部。犬前列腺常见的弥漫性腺体增生与癌之间似乎没有关联。犬的一种独特病变是前列腺鳞状化生，与睾丸产生雌激素的支持细胞瘤有关。家畜中发生三种不同的阴茎传染性肿瘤。犬的性病肿瘤只能在舔舐和性交接触期间通过完整的肿瘤细胞传播，而牛的纤维乳头瘤和猪的鳞状乳头瘤可通过无细胞物质传播。在牛中，纤维乳头瘤由导致皮肤乳头瘤病的同一病毒引起。所有这三种肿瘤都是良性的，通常会自发消退。
