Objective: Surgery is main treatment used in most early breast cancer cases; surgery is the primary treatment for breast cancer to remove as many as cancer cells as possible. There are two types of surgeries: mastectomy and lumpectomy. Studies have shown that mastectomy is the most performed in comparison to lumpectomy. With our data, out of 1485 cases of breast cancer, 146 were primarily treated by mastectomy while only 26 were treated with lumpectomy. We analyzed, in detail, the information on mastectomy as a treatment option for breast cancer to compare the use of different types of mastectomy and to study the cost of the most frequent types. Methods: We used the 2004 data from the National Inpatient Sample (NIS). We first filtered the data with respect to the main types of mastectomy: radical mastectomy, modified radical mastectomy, simple (total) mastectomy, and the subcutaneous mastectomy. Second, we analyzed them with summary statistics using SAS, and then finally, we looked at the cost of the most frequent by plotting the actual costs and the future trend. We used SAS Text Miner to compress patient diagnoses, and compare them to the types of treatment. Results: The modified radical mastectomy is the most frequently used in treating breast cancer with 81.5% of the total mastectomies. Then, we have the simple (total) mastectomy with 13.7%. Finally, we have the subcutaneous mastectomy (2.7%) and the radical mastectomy (2.1%). The cost of the modified radical mastectomy has a constant trend of around $20,000. Conclusion: The modified radical mastectomy is the most performed so far in the treatment of breast cancer by mastectomy. SAS can be used to study healthcare cases.