Final answer:
The first step in treating sarcomas that are 3cm or larger is generally surgery, with the goal of removing the entire tumor and possibly nearby lymph nodes. Surgery has the potential to cure localized sarcomas or, at the very least, alleviate symptoms and extend survival if the cancer has spread.
Step-by-step explanation:
The first step in treating sarcomas that measure 3cm or more is typically surgery. Surgery is the primary method to treat most isolated, solid cancers, including sarcomas. It involves the removal of the entire tumor, and often includes the excision of adjacent local lymph nodes. When a sarcoma is still localized, the goal of surgery is to completely cure it. If the cancer has spread beyond the localized area but is still confined to a certain region, surgical intervention may not be curative but can help to reduce symptoms and potentially prolong the patient's survival.