E. Kawakami et al., CHLORMADINONE ACETATE PELLET IMPLANTATION PLUS SHORT-TERM ORAL-ADMINISTRATION IN DOGS WITH BENIGN PROSTATIC HYPERTROPHY, International journal of andrology, 21(2), 1998, pp. 67-73
Eight beagles with benign prostatic hypertrophy (BPH) were treated by
subcutaneous implantation of pellets containing 10 mg/kg chlormladinon
e acetate (CMA), a synthetic anti-androgen, plus daily oral administra
tion of CMA at 2 mg/kg per day for 7 days as a therapy for BPH. prosta
tic and testicular size were measured and prostatic and testicular bio
psies were performed by laparotomy before and after CMA treatment. Pla
sma levels of luteininzing hormone (LH), testosterone and oestradiol w
ere also measured. The clinical signs of BPH, for example haematuria a
nd dysuria, resolved within 1 week of treatment. Mean prostatic volume
decreased to 56% of the pretreatment value. At CO weeks after treatme
nt, prostatic volume had decreased by 36%. Histological examination of
the prostate 1 week after treatment revealed reduction in diameter of
the alveoli and in height of the glandular epithelium. Degeneration a
nd atrophy of the glands were marked 4-12 weeks after treatment. In th
e testis, the diameter of seminiferous tubules and the number of germ
cells in the seminiferous tubules had decreased markedly at 12 and 24
weeks after treatment. Although plasma LH concentrations did not under
go any marked fluctuations after CMA treatment, levels of testosterone
and oestradiol were lower than before treatment. The results indicate
that implantation of 10 mg/kg CMA, plus 7-day oral administration of
2 mg/kg CMA, bring about resolution of the clinical signs and marked r
eduction in prostatic volume within 1 week of treatment.