No need to disclose your medical history pre-employment and during employment only if it affects your ability to apply to a job or perform it. I have worked in recruiting and it troubled me when applicants would write long cover letters disclosing personal information including marital status, how many kids they have and health problems that are not problematic anymore i.e. these candidates do not need an accommodation to apply to the job or perform the job, so why bring it up. All of this extra information is personal and irrelevant. Recruiters and hiring managers just want to hire someone who can do the job. Keep it professional and if you do need an accommodation such as a flexible schedule for doctor appointments, bring it up up during the offer stage or interview if work schedule comes up; most employers are flex w/ adjusting schedules especially if you are their candidate and want to hire you. Also you don't need to tell your employer what the doc appt. is for and they cannot ask, that is illegal. Work with your doctors too, most understand you work, grab that last appt of the day or see your doc during an extended lunch hour so the impact on your employer is minimized. I was in the middle of my TE fills during a new big job and was often my PS last appt of the day and my employer had no idea of any of these appts.

There may well be discrimination against BC survivors, but that piece of work by PSU people did not address the question competently.