Stage is a clinical label that describes how far a cancer has spread in the body. It summarizes key findings from exams, imaging, and sometimes surgery or biopsy results. Stage is commonly used at diagnosis, after surgery, and when planning cancer treatment. It helps clinicians communicate clearly and choose appropriate next steps.

Metastatic disease means cancer has spread from where it started to a distant part of the body. It is commonly used in oncology to describe cancer stage, expected behavior, and treatment planning. The original cancer is called the *primary tumor*, and the new sites are called *metastases*. Even after spreading, the cancer is still named for where it began (for example, breast cancer with bone metastases).

Locally advanced is a clinical term that describes a cancer that has grown beyond where it started but has not spread to distant organs. It often means the tumor involves nearby tissues, structures, or regional lymph nodes. It is commonly used in staging discussions, imaging reports, and oncology treatment planning. The exact meaning can vary by cancer type and stage.

A Secondary tumor is a tumor found in a new location after cancer cells spread from an original (primary) cancer. The term is commonly used in oncology to describe metastasis, meaning “spread” to another organ or tissue. Sometimes people also use “secondary” to describe a new, separate cancer that develops later (a second primary cancer). Because the wording can be confusing, clinicians often clarify what “secondary” means in each case.

A Primary tumor is the first tumor that forms where a cancer begins. It is different from tumors that appear after cancer spreads to other organs. The term is used in pathology reports, imaging results, staging, and treatment planning. Clinicians use it to describe the “origin site” of a person’s cancer.

Metastasis is the spread of cancer cells from where they started to another part of the body. It is commonly discussed in cancer diagnosis, staging, and treatment planning. A metastatic tumor is made of the same cancer type as the original (primary) tumor. Metastasis is a key concept in oncology, pathology, radiology, and cancer surgery.

Myeloma is a blood cancer that starts in plasma cells, a type of white blood cell found in the bone marrow. It is commonly used to describe **multiple myeloma**, the most frequent form. Myeloma is discussed in oncology, hematology, radiology, pathology, and supportive cancer care because it can affect bones, kidneys, blood counts, and immunity. Care often involves both treating the cancer and preventing or managing complications.

Leukemia is a cancer that starts in blood-forming tissues, most often the bone marrow. It leads to abnormal blood cells that can crowd out normal blood production. Leukemia is a clinical diagnosis used in oncology and hematology to classify blood cancers and guide care. The term is commonly used in clinics, hospitals, and labs when blood counts or marrow tests suggest a blood-cell malignancy.

Lymphoma is a cancer that starts in lymphocytes, a type of white blood cell. It most often involves lymph nodes, but it can begin or spread in many organs. Lymphoma is commonly discussed in hematology-oncology clinics and cancer centers. The term covers several related diseases with different behaviors and treatments.

Sarcoma is a type of cancer that starts in connective tissues such as muscle, fat, nerves, blood vessels, cartilage, or bone. It is commonly discussed in oncology, surgery, radiation therapy, and pathology because diagnosis and treatment often require multiple specialties. Sarcoma care is used in both adult and pediatric cancer settings, depending on the subtype and the patient’s age.