The short answer
Most testicular cancers are germ cell tumors, divided into two main types: seminomas, which tend to grow slowly, and non-seminomas, which tend to grow faster. Both are highly treatable, and the type guides treatment.
Most testicular cancers are germ cell tumors.
The two main types are seminoma and non-seminoma.
Seminomas tend to grow more slowly.
Non-seminomas tend to grow and spread faster.
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The full explanation.
The simple version
Most testicular cancers are germ cell tumors. These start in the cells that make sperm. They come in two main types: seminoma and non-seminoma. Both are highly treatable, even when they have spread. Knowing which type you have helps your team choose the right treatment.
Seminoma
Seminoma tends to grow slowly compared to other testicular cancers. It typically stays in the testicle longer before spreading. Seminoma is very sensitive to radiation. That makes radiation a useful tool for some stages of this type. It is also very sensitive to chemotherapy.
Non-seminoma
Non-seminoma is a group of several related cancer types. It is not just one single type. It tends to grow and spread faster than seminoma. Doctors generally treat it differently. Treatment often relies more on chemotherapy. Some cases also need surgery to remove affected lymph nodes. Some tumors have features of both seminoma and non-seminoma cells mixed together. Doctors treat these mixed tumors as non-seminomas, since that is the more aggressive part.
Both seminomas and non-seminomas are highly treatable, even when the cancer has spread.
How the type is confirmed
Doctors almost always diagnose and treat testicular cancer the same way at first. They remove the whole testicle through a groin incision. This surgery is called an inguinal orchiectomy. A pathologist then examines the tissue under a microscope. This confirms the exact type. This step happens for nearly everyone. Doctors generally avoid a direct biopsy of the testicle, since it risks spreading cancer cells.
Tumor markers help tell the types apart
Blood tests for three substances help confirm and track testicular cancer. These tumor markers are AFP, beta-hCG, and LDH. Seminomas rarely raise AFP levels. Some non-seminomas do raise it. This pattern helps doctors guess which type is more likely, even before surgery. After treatment starts, these same markers help track progress. Levels should fall as the cancer responds to treatment.
Why the type shapes treatment
After the testicle is removed, the type strongly shapes what happens next. Some people with early-stage cancer are safe to monitor closely instead of getting more treatment right away. Doctors call this surveillance. Others need chemotherapy, radiation, or surgery to remove lymph nodes in the abdomen. This lymph node surgery is called a retroperitoneal lymph node dissection. Seminoma and non-seminoma are watched and treated somewhat differently at every stage. That is why confirming the type matters so much.
What to ask your team
Ask whether your testicular cancer is a seminoma or non-seminoma. Ask what your tumor marker levels show. Ask how the type affects your treatment options. Ask whether surveillance is a reasonable choice for your specific case.
Rarer, non-germ cell types
More than 9 in 10 testicular cancers are germ cell tumors, the seminomas and non-seminomas described above. A smaller group, called stromal tumors, makes up less than 5% of adult testicular tumors, though a larger share in children. Leydig cell tumors and Sertoli cell tumors are the main examples. Most of these are benign, meaning not cancer, though a small number do spread and need cancer treatment. Your pathology report will note whether your tumor is a germ cell tumor or one of these rarer types, since that changes the treatment approach.
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Common questions
What are the main types?
Most testicular cancers are germ cell tumors, which come in two main types: seminomas and non-seminomas. Some tumors have features of both, and are treated as non-seminomas.
How do they differ?
Seminomas tend to grow more slowly and are very sensitive to radiation. Non-seminomas tend to grow and spread faster. The type affects which treatments are used after surgery.
Are both treatable?
Yes. Both seminomas and non-seminomas are highly treatable and often curable, even when they have spread.
How is the type determined?
The type is confirmed by examining the removed testicle, along with blood tests of tumor markers that can help distinguish the types.
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Last updated: 2026-08-18Next planned review: 2027-07-07
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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