Dismiss Modal

Diagnosis

Cancer of Unknown Primary: Newly Diagnosed

Choose a preferred language


Being told you have cancer of unknown primary (CUP) can be scary, and you may have many questions. But you have people on your care team who can help.


Coping with fear

It's normal to feel afraid and uncertain. You're facing a lot of unknowns and maybes. This can make it extra hard to deal with cancer. Learning as much as you can about the cancer and about the treatment options you have can make you feel less afraid. It can also help you work with your care team and make the best choices for your treatment. You can also ask to speak with a counselor.


Working with your care team

To decide the best course of treatment, your doctor needs to learn as much as they can about the cancer. Even if they can't figure out where the cancer first started, there are other things that can help guide treatment, like tumor markers and gene or protein changes in the cancer cells. Learning these details will include getting a lot of tests and maybe working with more than one doctor.

Your care team might include:

  • Oncologist. This doctor specializes in treating cancer.
  • Medical oncologist. This doctor specializes in treating cancer with medicines.
  • Radiation oncologist. This doctor specializes in treating cancer with radiation.
  • Surgical oncologist (oncologic surgeon). This doctor uses surgery to treat cancer.
  • Pathologist. This doctor has extra training in using lab tests to find cell changes and diagnose diseases.

Other members of your team will be oncology nurses, a social worker, dietitian, counselor, pharmacist, and more. They'll answer any questions you have. They'll help you through each of the steps you'll take before, during, and after treatment. Your team will let you know what tests you need and the results of those tests. They'll guide you in making treatment decisions. They'll also help prepare you and your loved ones for what's ahead.

You may want to get a second opinion to confirm your diagnosis and find out more about treatment options. Your team can help you do this, too. For the most part, taking some time to learn as much as you can and make an informed decision about the best treatment for you will not hurt your chance of the treatment working. And it can help you feel comfortable with your plan moving forward.


Learning about treatment options

Remember, it's more important to make an informed decision than a quick one. You should get all the information you can to help make the decision. It can also help you know what to expect from treatment and from your cancer care team.


Getting support

Coping with cancer can be very stressful. Talk with your care team about seeing a counselor. They can refer you to someone who can help. You can also visit support groups to talk with other people coping with cancer. Ask your care team about local or online support groups.

Featured in

© 2026 The StayWell Company, LLC. All rights reserved. This information is not intended as a substitute for professional medical care. Always follow your healthcare provider's instructions.
Man and woman looking at laptop

Oncology

Find a Doctor
Related Articles
Read article
Oncology
Grading of Bladder Cancer

Once cancer has been diagnosed, the next step is to choose the best way to treat it. To help do this, your healthcare provider checks what the cancer cells look like under a microscope. (This is called the cancer grade.).

Read article
Oncology
Cancer of Unknown Primary: Stages

Most cancers are staged with the Roman numerals I, II, III, and IV. The stage of cancer of the unknown primary is at least a stage II.

Read article
Oncology
Endoscopic Exam for Cancer

An endoscope is a small, flexible tube with a light and a lens on the end used to look into the esophagus, stomach, duodenum, colon, or rectum. It can also be used to take tissue from the body for testing or to take color photographs of the inside of the body.

Read article
Oncology
Excisional Biopsy: Neck Lymph Node

Excisional biopsy helps find the cause of an enlarged lymph node. During it, the entire enlarged lymph node is removed. It's then sent to a lab for testing.