Can A Person With Malignant Lump In Breast Donate Kidney?

I had operation in 2003 two times. First Time, lumpoctomy removed lump from my brest, first result came cancer +, We went Second opinion Cancer negative, we went for near about 7 opinions, in that 4 positive and 3 negative result came. After that I had second operation to clear the doubt removing tissues from nodules and it was found cancer negative. I had clinic test continuously one year and after one year dr adivised me to take all test, lastly due to throid problem the lump found in my brest. So now I am taking thyroxin 100 mg alongwith calcium and iron ( due to low hemoglobin) tablets. Last year I had taken memography test and it is found normal study. am having one daughter she is studying 9th std. Now my question is my brother is suffering from kidney problem. In this case my blood group and his blood is O positive. Can I donot my kidney to my brother. He is requesting me to donot the same. What will be consequences if I donot kidney. My mother died due to kidney failure. She had diabieties and PB. Please suggest me.