time only in cancer cells and a laser will change the hematoporphyrin into a toxic drug. This technique is still
  experimental. A new study now suggests that vitamins A, C, E and beta carotene may be beneficial with BCG
  in preventing new tumors. 

Stage I or A 
TNM T1, N0, M0 
The tumor is superficial. It does not invade through the lamina propria and cannot be felt. There is no spread to lymph nodes and no metastases.

Standard Treatment  Same as for Stage 0.

Five-Year Survival  Over 75 percent 

Investigational  Same as for Stage 0.