I wish you the best outcome with your treatments and I know that much progress has been made in the treatment of cancer. I trust your doctors are taking very good care of you.
As for ordination, I might suggest Wat Sri Boen Ruang in northern Thailand, for consideration of Samanera ordination, and if you wish to proceed further, for Bhikkhu ordination. You may find information about the Temple at: http://www.monkordination.com
The Abbot at WSBR is Dr. Apisit, a young Bhikkhu with a Ph.D. who is a wonderful person and a very engaged community leader through WSBR. The Wat itself is a very vibrant community center in northern Thailand. At WSBR is Phra Fred and Phra Greg, a British Bhikkhu and New Zealander, respectively. Both of these BHikkhus are very dedicated monks and teachers, as well as being just very good people. They help make the experience at WSBR very welcoming and vibrant. To note, in the area (Chiang Mai) are several excellent world class hospitals, in the event you would need any follow up care.
Many from the US and Europe have come to WSBR to visit, to take vipassana teachings, and further, to stay for a longer period for samanera ordination. Others, Thai and Western alike, stay on and progress toward Bhikkhu ordination. I recommend at least contacting Phra Fred or Phra Greg regarding your wishes. Phra Greg's email and contact info is at the site mentioned above.