The cause of Kidney Cancer is unknown. Cigarette smoking certainly does increase the risk. Rarely, certain genetic (inherited) syndromes increase the risk as well (specifically von Hippel-Lindau syndrome). Those on long-term dialysis may also have increased risk of developing Renal Cell Carcinoma.
MRI ordoppler Ultrasound to check for tumor thrombus in realigning the vein and inferior vena cava
Surgical removal of the affected kidney (if the tumor is only in the kidney, there is a 90-100% chance of a 5-year survival rate).
Chemotherapy may be tried in more advanced diseases. Vinblastine, alpha interferon, or interleukin -- 2 may be considered.
If you suspect this condition, seek medical treatment very soon. If this disease is caught early, there is more of a chance for recovery then if it is detected late.