Employers: Make sure you understand the law
If you are on the other side, there are steps you can take as well to support existing and potential employees who are undergoing cancer treatment.
First of all, ensure that you are knowledgeable about the laws and that you follow them. Cancer patients and survivors are protected under the Americans with Disabilities Act. It is illegal to discriminate against them, even if they are no longer sick.
This also means that you cannot inquire as to whether they have cancer, even by using sly methods such as asking if they have ever taken a certain chemotherapeutic medication.
If they are having trouble at work now, but are still able to accomplish their job with certain types of assistance, employers are required to provide that assistance, as long as it is a reasonable accommodation.