Many people are confused with the Oncology and tumor. here I will introduce it to all of you.
Oncology is a branch of medicine that deals with the study, treatment, diagnosis and prevention of cancer. A medical professional who practices oncology is an oncologist. [1] The name's etymological origin is the Greek word ὄγκος (ónkos), meaning "tumor", "volume" or "mass".[2]
Oncology is concerned with:
The diagnosis of any cancer in a person (pathology)
Therapy (e.g. surgery, chemotherapy, radiotherapy and other modalities)
Follow-up of cancer patients after successful treatment
Palliative care of patients with terminal malignancies
Ethical questions surrounding cancer care
Screening efforts:
I hope this can help you with this field.
source: https://en.wikipedia.org/wiki/Oncology