Penile Cancer Stages: What Stage 0 Through Stage 4 Mean

When you are told you have penile cancer, the next question your care team works on is how far it has gone. The answer is called the stage. Staging is the process of measuring how much cancer is in your body and where it is. It looks at how deeply the tumor has grown into the penis, whether cancer cells have reached the lymph nodes (small filtering glands that help fight infection) in your groin and pelvis, and whether cancer has traveled to distant organs such as the lungs, liver, or bones. This can be every confusingand we will try to help you make sense of it.

Stage matters for two practical reasons.

1. Treatment: A cancer that sits only in the top layer of skin can often be treated with a cream, a laser, or a small surgery that leaves the penis looking and working much as it did before. A cancer that has grown into the erectile tissue or reached the groin nodes usually needs a bigger operation, and sometimes radiation or chemotherapy as well. Your stage is the main thing that separates those two paths. You can read more about each option in our guide to penile cancer treatment.

2. Outlook: Stage gives your doctor a general sense of how likely the cancer is to be cured and how closely you will need to be watched afterward. It is a rough guide, not a prediction about you personally, and we will come back to that at the end of this guide.

It helps to know from the start that your stage can change.

1. Clinical Stage: Doctors usually assign a first stage before surgery, based on the physical exam, the biopsy, and any scans.

2. Pathologic Stage: After surgery, a pathologist studies the tissue that was actually removed and can measure things far more precisely. Sometimes this stage is referred to as the surgical stage, and it is generally the more accurate of the two. It is common for the two to differ.

If your stage goes up or down after surgery, nothing went wrong. It simply means your team now has better information.

Staging for penile cancer can get technical, partly because this cancer is rare and partly because the rules were rewritten fairly recently. You do not need to memorize any of it. What you do need is enough of the vocabulary to follow the conversation, ask good questions, and understand why your team is recommending what they are recommending. That is what this guide is for.

How Doctors Stage Penile Cancer

Penile cancer is staged with the TNM system, created by the American Joint Committee on Cancer, often shortened to AJCC. TNM stands for three separate questions that get answered one at a time.

• T asks how far the tumor has grown into the penis.

• N asks whether cancer has reached the lymph nodes in the groin and pelvis.

• M asks whether cancer has spread to distant parts of the body, which doctors call metastasis.

Each letter gets a number or a small letter after it, and the higher the number, the more the cancer has advanced. Once all three are known, they are combined in a step called stage grouping to give an overall stage from 0 to 4.

The T category is worth understanding well, because for penile cancer it is about depth, not width. A wide flat patch that stays in the surface skin is an early T. A small lump that has burrowed down into the erectile chambers is a much higher T. Working from the outside in, the layers are the surface skin layer, then the loose subepithelial connective tissue just underneath it, then the corpus spongiosum (the spongy erectile chamber that runs along the underside of the shaft and forms the head of the penis), then the two corpora cavernosa (the larger paired erectile chambers along the top of the shaft), and finally structures outside the penis such as the scrotum, the pubic bone, or the prostate. The urethra (the tube that carries urine and semen out of the body) runs through the corpus spongiosum.

The N category carries the most weight of the three in penile cancer. This cancer spreads in an orderly way. It travels first to the inguinal lymph nodes (the nodes in the groin crease on either side), then to nodes deeper inside the pelvis, and only after that to distant sites. That order is why your doctor presses so firmly along both sides of your groin at every visit, and why so much of the workup is aimed at the groin. Nodes deeper still, in the back of the abdomen above the pelvic area, are counted as distant spread rather than regional spread.

The M category is usually the simplest. Either there is cancer in a distant organ, or there is not. Distant spread at the time of first diagnosis is uncommon in penile cancer, and when it does occur, it almost always comes alongside heavy groin or pelvic node involvement rather than on its own.

Clinical versus pathologic staging.

• Clinical staging: uses everything that can be learned without removing the tumor and the nodes: your doctor's hands, the biopsy report, an ultrasound, an MRI, a CT scan, or a PET/CT scan. Clinical categories are written with a small c in front, such as cT2 or cN1.

• Pathologic staging uses the tissue itself after surgery and is written with a small p, such as pT2 or pN1. The gap between the two can be real. Groin nodes that feel completely normal can still hide small deposits of cancer, and groin nodes that feel swollen are often just reacting to an infected tumor rather than containing cancer at all. That is why surgical checking of the nodes, through a sentinel node procedure or a node dissection, is such an important part of staging. Our guide to How penile cancer is diagnosed walks through each of those tests.

Grade is a separate thing from stage, and the two are easy to mix up. Stage describes how much cancer there is and where. Grade describes how abnormal the cancer cells look under a microscope.

• Grade 1: cells still resemble normal cells and are called well differentiated.

• Grade 2: some cells are abnormal and are often called moderately differentiated.

• Grade 3: cells look very abnormal and do not resemble the normal, healthy cells; they are often called poorly differentiated.

• Grade 4: cells cannot perform their normal job and quickly copy themselves over and over; they are often called undifferentiated.

Doctors also use the term high-grade for grade 3 and above. Higher grade cancers tend to grow faster and are more likely to reach the lymph nodes. In penile cancer, grade is not just extra information sitting beside the stage. It is folded directly into the T category, because a poorly differentiated tumor in the connective tissue is classified as T1b rather than T1a even though the depth is the same.

Two more pathology findings feed into the stage in the same way. Depth of invasion is how far down the deepest cancer cell reaches, measured in millimeters from the surface, and it is the single biggest driver of the T category and of whether organ-sparing surgery is possible. Lymphovascular invasion means the pathologist saw cancer cells inside the small lymph channels or blood vessels within the tumor, and perineural invasion means cancer cells were seen wrapped around nerves. Both mean cancer cells have found a route out of the tumor, and either one pushes a connective tissue tumor from T1a up to T1b. That single letter change matters a great deal in practice, because it is often the point at which guidelines start strongly recommending surgery to check the groin nodes.

What Do the T, N, and M Categories Mean?

• T1 is split into T1a and T1b: based on lymphovascular invasion, perineural invasion, and grade.

• T2 or higher risk: A tumor sitting near the tip can reach the nearby urethra through the corpus spongiosum

• T3 or lower risk: Corpus cavernosum invasion and urethral involvement no longer changes the number by itself.

T Categories: How Far the Tumor Has Grown

• TX: The main tumor cannot be assessed, usually because there is not enough tissue or information.

• T0: There is no evidence of a main tumor.

• Tis: Abnormal cells are present only in the top layer of skin and have not grown any deeper. This is also called carcinoma in situ, or penile intraepithelial neoplasia (PeIN). These cells are not yet invasive cancer, but they can become invasive if they are left alone.

• Ta: A noninvasive verrucous carcinoma, which is a wart-like growth that can get quite large on the surface but does not push down into the tissue below.

• T1a: The tumor has grown into the subepithelial connective tissue just under the skin, with no lymphovascular invasion, no perineural invasion, and no poorly differentiated cells.

• T1b: The tumor has grown into the same layer of connective tissue just under the skin, but there is lymphovascular invasion, or perineural invasion, or the cells are poorly differentiated. Same depth as T1a but higher risk.

• T2: The tumor has grown into the corpus spongiosum, the spongy erectile chamber on the underside of the shaft that also forms the head of the penis. The urethra may or may not be involved, and that does not change the category.

• T3: The tumor has grown into a corpus cavernosum, one of the two larger erectile chambers along the top of the shaft. Again, the urethra may or may not be involved.

• T4: The tumor has grown out of the penis and into a neighboring structure, such as the fat in front of the pubic bone, the scrotum, the spermatic cord, the pubic bone itself, or the prostate.

N Categories: Whether Cancer Has Reached the Lymph Nodes

The N category is written two different ways, and it is genuinely important to know which one you are looking at. The clinical version, written with a small c, is based on what your doctor can feel in your groin and see on imaging. The pathologic version, written with a small p, is based on lymph node tissue that was actually removed and examined under a microscope. The two use different definitions, so cN1 and pN1 do not mean the same thing.

• cNX: The regional lymph nodes cannot be assessed.

• cN0: No inguinal lymph nodes can be felt, and none look enlarged on imaging.

• cN1: One inguinal lymph node on one side can be felt, and it moves freely under the skin.

• cN2: Several inguinal nodes can be felt, or nodes can be felt on both sides. They still move freely.

• cN3: There is a fixed mass of inguinal nodes that does not move, or there are enlarged nodes in the pelvis on one or both sides.

• pNX: The regional lymph nodes cannot be assessed.

• pN0: No cancer was found in any of the lymph nodes that were removed.

• pN1: Cancer was found in one or two inguinal lymph nodes.

• pN2: Cancer was found in more than two inguinal nodes on one side, or in inguinal nodes on both sides.

• pN3: Cancer was found in one or more pelvic nodes on either side, or there is extranodal extension, which means cancer has broken through the outer capsule of a node and grown into the surrounding tissue. Extranodal extension counts as pN3 no matter how many nodes are involved.

M Categories: Whether Cancer Has Spread to Distant Organs

• M0: There is no sign of distant spread.

• M1: Cancer has spread to a distant part of the body. The most common sites are distant lymph nodes, the lungs, the liver, and the bones. Lymph nodes in the back of the abdomen, above the pelvic area, count here rather than in the N category.

• pM1: Distant spread has been confirmed under a microscope, usually with a biopsy of the distant site.

The Stages of Penile Cancer

Once your T, N, and M categories are known, they are combined into one overall stage. Stages are written as Roman numerals I, II, III, and IV, or sometimes as 1, 2, 3, and 4, with stage 0 sitting before them. Some stages are split into an A and a B part. Everything in stages 0 through IIB is node negative, meaning the nodes are clear and the difference between the stages is depth. From stage IIIA onward, the deciding factor is the lymph nodes.

The treatment notes below describe what care usually looks like at each stage in general terms. They are not a recommendation for you. Which treatment fits depends on your pathology, your anatomy, your other health conditions, what matters most to you, and what your team has experience with.

Stage 0is and Stage 0a

Stage 0 is Tis or Ta with clear nodes and no distant spread, and it is divided into two.

• Stage 0is means abnormal cells are found only on the surface of the skin of the penis, a condition also called carcinoma in situ or penile intraepithelial neoplasia.

• Stage 0a means a noninvasive squamous cell carcinoma is found on the surface of the skin of the penis or on the inner surface of the foreskin, without growing any deeper. This is sometimes called noninvasive localized squamous cell carcinoma.

This is the best case. The abnormal cells have not crossed into the tissue underneath, so they have essentially no way to reach the lymph nodes yet. Treatment is usually the least invasive kind. Options at this stage include a cream applied to the skin, such as topical chemotherapy with fluorouracil or topical immunotherapy with imiquimod, laser surgery, cryosurgery to freeze the abnormal tissue, Mohs microsurgery that shaves off thin layers while checking each one under a microscope, or circumcision when the abnormal area is confined to the foreskin. Most men keep the appearance and function of the penis. The tradeoff is that surface treatments can leave abnormal cells behind, so close follow-up is part of the plan.

Stage I

Stage I is T1a with clear nodes and no distant spread. The cancer has crossed into the connective tissue just under the skin, so it is now invasive. There is no lymphovascular invasion, no perineural invasion, and no growth into blood vessels or nerves, and the cells are not poorly differentiated.

This is still early disease, and it is often highly curable. Because the tumor is shallow and low risk, the chance of hidden cancer in the groin nodes is small enough that guidelines generally do not recommend node surgery for the lowest risk stage I tumors. Treatment often focuses on removing the cancer while preserving as much of the penis as possible. If the cancer is only on the foreskin, wide local excision along with circumcision may be all that is needed. Other options include Mohs microsurgery, wide local excision, radiation therapy given either from outside the body or with radioactive material placed near the tumor, or partial removal of the penis when the tumor's position makes a smaller operation impractical. Grade 2 tumors that are otherwise T1a sit in a gray zone, and whether to check the nodes surgically is decided case by case.

Stage IIA

Stage IIA is T1b or T2 with clear nodes and no distant spread. Two quite different situations land here.

• In the first, the cancer is still only in the connective tissue just under the skin, but it has entered lymph vessels, blood vessels, or nerves, or the cells look very abnormal or spindle-shaped under the microscope.

• In the second stage, the cancer has grown into the corpus spongiosum, with or without reaching the urethra.

What links the two is risk of spread. Once the cancer is T1b or deeper, the odds that cancer cells have already slipped into the groin nodes rise sharply, and guidelines strongly recommend checking those nodes surgically even when your groin feels completely normal. That is usually done with a dynamic sentinel node biopsy, which removes only the first node or nodes that fluid from the tumor drains into. Treatment of the tumor itself is typically surgery, either an organ-sparing operation or partial removal of the penis, sometimes with radiation therapy before surgery. Organ sparing approaches are used where the tumor's size and position allow it, with the understanding that they carry a somewhat higher chance of the cancer coming back in the same place.

Stage IIB

Stage IIB is T3 with clear nodes and no distant spread. The cancer has grown through the connective tissue that surrounds a corpus cavernosum and into that chamber, which is one of the two main erectile bodies running along the top of the shaft. The urethra may also be involved.

This is a deeper disease than stage IIA, though the nodes are still clear. Because the cancer sits inside the main erectile tissue, organ-sparing surgery is often not possible, and treatment usually means partial or total removal of the penis to get a clear margin of normal tissue all the way around. Radiation therapy before surgery is another option. Surgical checking of the groin nodes on both sides is recommended, since the risk of hidden node disease at this depth is substantial. If reconstruction or later penile reconstruction is something you want to consider, this is the point to raise it, because planning it early gives your surgeons more options.

Stage IIIA

Stage IIIA is any T from T1 through T3 with pN1 and no distant spread. In plain terms, the tumor is somewhere in the penis, from the connective tissue down to a corpus cavernosum, and cancer has been found in one or two inguinal lymph nodes on one side of the groin.

Node involvement changes the plan. Treatment usually combines removing the tumor with removing the groin nodes on the affected side, an operation called an inguinal lymph node dissection. Radiation therapy may be added, and chemotherapy is sometimes given before or after surgery depending on how much node disease was found. Node surgery carries real side effects, including lymphedema (swelling in the leg or groin when lymph channels are cut), fluid collections under the skin, numbness, and slow wound healing, so it is worth asking about them in advance and about what can be done to reduce them.

Stage IIIB

Stage IIIB is any T from T1 through T3 with pN2 and no distant spread. Cancer has been found in three or more inguinal nodes on one side of the groin, or in inguinal nodes on both sides. The tumor itself may be at any of the T1 through T3 depths.

Treatment at this stage is almost always multimodal, meaning more than one type of treatment is used. That typically involves removing the tumor, removing the groin nodes on both sides, and adding chemotherapy, radiation therapy, or both. Chemotherapy given before surgery, called neoadjuvant chemotherapy, is often used to shrink bulky node disease so that surgery has a better chance of removing everything. Because pN2 disease also raises the risk that cancer has reached the pelvic nodes, imaging of the pelvis with a PET/CT scan and sometimes removal of the pelvic nodes come into the discussion. This is also a stage where a clinical trial is very much worth asking about, and where being treated at a center that handles penile cancer regularly makes a measurable difference.

Stage IV

Stage IV is the broadest stage, and it covers three different situations.

• The first is any T4 tumor with any N, meaning the cancer has grown out of the penis into a neighboring structure such as the scrotum, the prostate, or the pubic bone, whether or not nodes are involved.

• The second is any T with N3, meaning cancer has reached the pelvic nodes on one or both sides, or has broken through the capsule of a node and grown into the surrounding tissue.

• The third is any T and any N with M1, meaning cancer has spread to distant lymph nodes or organs such as the lung, liver, or bone. That last situation is also called metastatic penile cancer.

Treatment at stage IV varies enormously depending on which of those three situations applies, and that is a genuinely important point. A man with a locally advanced T4 tumor and clear distant scans is in a very different position from a man with cancer in his lungs. When cancer is confined to the pelvis and groin, treatment may still aim at long-term control with a combination of chemotherapy, surgery to remove the tumor and the nodes, and radiation therapy. When cancer has reached distant organs, treatment is usually systemic, meaning chemotherapy or newer immune-based drugs that travel through the bloodstream, along with radiation or surgery to relieve specific problems.

Some stage IV treatment is described as palliative, which means the goal is to control symptoms and protect quality of life rather than to cure. Palliative treatment is real treatment. It can shrink tumors, relieve pain, stop bleeding, and help you feel better, and it can be given at the same time as treatments aimed at the cancer itself. Men with bulky or fixed groin or pelvic nodes have low survival rates when surgery is used alone, which is exactly why combined treatment and clinical trials are recommended at this stage. Newer immune-based and targeted treatments are an active area of research for advanced penile cancer, so ask your team what trials are open. Our guide to joining a clinical trial for penile cancer explains how to look for one and what taking part involves.

Penile cancer staging (Source: Canadian Cancer Society)

Recurrent Penile Cancer

Recurrent penile cancer means cancer that has come back after treatment. It happens when a small number of cancer cells survived the first round of treatment and were too few to show up on any test, then grew over time into something detectable. A recurrence does not mean your first treatment was wrong or that you did anything wrong afterward. It means some cells got through.

Doctors describe recurrence by where it shows up.

• Local recurrence means the cancer is back in the same place it started or very close by, on or in the penis itself.

• Regional recurrence means it has come back in the lymph nodes or tissues near where it started, most often the groin.

• Distant recurrence means it has appeared in an organ or tissue far away, such as the lungs or the liver, which is the same thing as metastasis.

Where the recurrence is makes a real difference to what happens next and to the outlook. Local recurrence after organ sparing treatment is the most common kind, and it is also the most treatable. In one large series of 314 men, local recurrence occurred in about 35% of patients at a median of roughly ten months after treatment, and when those recurrences were found and treated promptly, disease-specific survival was good. The usual treatment is surgery to remove the area again with clear margins. Your team will often also want to recheck the groin and pelvic nodes at that point, especially if node surgery was never done the first time.

A recurrence in the groin nodes is more serious than a local recurrence and is usually treated with more than one type of treatment, such as chemotherapy combined with surgery, or chemotherapy combined with radiation. If a groin recurrence cannot be removed surgically, treatment shifts toward systemic drugs, palliative radiation, and clinical trials. Distant recurrence is treated much like stage IV disease that spread from the start.

When cancer comes back, you will usually have many of the same tests you had at first diagnosis so your team can see exactly where it is. Doctors call this restaging, and they mark the new stage with a small r in front of it. Your original stage at diagnosis stays on your record and does not change, because that is the number all the research is based on. The new r stage describes your situation now.

What Your Stage Does and Does Not Tell You

Your stage is a guide, not a verdict. It is a way of grouping men whose cancers behave similarly so that doctors can choose sensible treatment and give a general sense of what to expect. It is not a measurement of how long you will live, and no honest doctor will treat it as one.

Statistics about stages come from large groups of men treated in the past. They describe averages, and you are not an average. Two men with identical stages can have very different outcomes depending on their age, their other health conditions, the exact subtype of their cancer, how their tumor responds to treatment, whether they were treated at a center that sees penile cancer regularly, and plain luck. Survival numbers also lag behind medicine. The figures published today reflect men treated years ago, before some current approaches and before the newer immune-based treatments now being studied for advanced disease.

The clearest and most useful pattern in the data is about lymph nodes. The presence and extent of cancer in the groin nodes, along with tumor grade, are the most important factors in long-term survival for invasive penile squamous cell carcinoma. Men whose nodes are clear do considerably better than men with extensive node involvement. Across many studies, men with no inguinal node metastases have five-year cancer-specific survival in the range of 85% to 100%. Men with cancer in a single inguinal node fall in the range of 79% to 89%. Men with multiple or bilateral inguinal node involvement fall in a much wider and lower range of 17% to 60%, and men with cancer in the pelvic nodes fall between 0% and 17%.

Looking at it by stage instead, men with stage I or stage II cancer that is still confined to the penis have five-year survival of up to about 85% after surgery. Men with stage III or stage IV disease have overall five-year survival of around 59%. When cancer has spread to distant parts of the body, five-year survival is around 11%. The American Cancer Society has estimated overall five-year survival for penile cancer in the United States at about 65%. Our guide to penile cancer survival rates looks at these numbers in more detail and explains how to read them.

Notice how wide some of those ranges are. That width is not sloppiness. It is the honest picture of a rare cancer studied in relatively small groups, and it is also the room in which your own outcome sits. A range from 17% to 60% is not a sentence. It is a reason to get the best treatment you can and to keep going to your follow-up appointments.

There is one thing stage cannot tell you at all, and it is worth saying plainly. Stage says nothing about how you will feel, what you will be able to do, whether you will be able to urinate standing up, whether you will have sex again, or how you will cope. Those things depend on which treatment you have, how your body heals, what support you have around you, and what you decide matters most to you. Many men are surprised by how much function and confidence they recover, and by how much help is available for the parts that do not come back on their own. HealthTree has penile cancer support resources, and talking with another man who has been through the same stage can be worth more than any statistic.

Finally, ask your team to explain your stage to you in words you understand, and ask them to write it down. Ask what your T, N, and M categories are, whether the stage is clinical or pathologic, whether your nodes have been checked and how, and what the stage means for your treatment options. Our guide to questions to ask about penile cancer has a printable list you can bring to your appointment. Because penile cancer is rare, it is also reasonable to ask how many cases your team treats each year and whether a referral to a specialized center makes sense. Every decision about your care belongs to a conversation between you and your own doctors, not to a number on a page.

Sources:

• Penile Cancer Stages, National Cancer Institute

• Penile Cancer Treatment by Stage, National Cancer Institute

• Cancer Staging, National Cancer Institute

• Recurrent Cancer: When Cancer Comes Back, National Cancer Institute

• Penile Cancer Stages, American Cancer Society