I am a Transgendered M->F and I Need to Prevent Breast Growth, What Can Be Done?

antiandrogens and estrogen will be administered on 3/30/2012 by medical health professionals, however i don't wish to grow breasts. i would like to know if it is possible to inhibit the growth of breast/mammary tissues rather than having the breasts be removed surgically via mastectomy. i am aware such treatments as radiation therapy and tamoxifen exist, but i lack knowledge regarding these treatments as being used in this circumstance. Additional details: i am 18, male, and quite serious.

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