How often to get a CT scan?

Hi, I have been receiving chemo for 1 year and 6 months.
This is my first reoccurence. I have not had a CT scan since
January so I asked my dr yesterday about it and he ordered
one of my chest,abdomen and neck. I have a tumor in my
neck and several in my abdomen and 1 under my arm.

I have a very bloated belly and I recently gained more
weight (10 pounds in 2 months). I look pregnant and I
am not. It is so frustrating because I don't overeat. I have
gained 50 pounds in a year and a half. I feel ugly because
of it. I used to weigh 145 and now just reached 200 pounds.
I have never in my entire life weighed this much.

I just had to go out and buy some bigger clothes. I hate
to look at myself in the mirror. I don't even like to take
a shower because I have to look at myself.

I was just wondering what you ladies thought was the
norm for how often you have to have CT scans. Should
I just have not mentioned it to the dr so if it is bad news
I don't get upset? My tumor marker was last 38. It had
got down to 27 and it also was in the 60's.

My dr is fixated on the fact that he wants my tumor
marker to be normal about 7 or 8 before he stops chemo.
I feel like I may be getting chemo for the rest of my life.
When do you decide to stop. I guess it is a good idea
to have a CT scan and see what is going on. I cannot
get PET scans because my insurance doesn't cover them.

I would appreciate any advise you might have. Does anyone
else feel the same way? Men used to flirt or at least
look my way. I am 44 and single. Now they don't even
give me a second glance. I had breast cancer 10
years ago and the dr did a bad job with the
reconstruction. So I feel like my whole body looks bad.

Thanks for reading. Sincerely, Nancy

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19 replies. Join the discussion

Hi Nancy,
My mother (age 51) was recently diagnosed with recurrent ovarian cancer (plantinum-resistant). She will be starting chemotherapy again in October and we actually spoke to her doctor today about her chemo regimen. My mother will continue with chemotherapy until her quality of life is too low and she has to switch to hospice.

In the meantime though, the doctor will determine when to switch to different drugs (or possibly off chemotherapy altogether) in three ways:

1) Tests. Her doctor told us that my mum will have a CT scan every three cycles of chemotherapy to monitor its progression. My mother also has the option of doing a PET scan instead of the CT scan, but in my mother's case (and it can vary from patient to patient), the doctor feels she can better visualize her cancer with the CT scan.

2) Symptoms. The doctor, my mother, and my family will monitor her symptoms. If she has new symptoms that show the tumor is growing, she will be switched. If she has chemo symptoms that become intolerable, she will be switched.

3) CA-125 level. The doctor will monitor this regularly to see how effective the chemo is.

I hope this helps a little.

Jackie

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Hello,
My Onc usually orders a ct scan when I start having signs or symptoms of a recurrence. My sister has been in remssion for over 3 years and he did one every 6 months. You seem to be on chemo a long time. My numbers always go into the normal zone so I'm not sure how long he would make me have chemo. He did say one time that if the same number continued for 3 chemo cycles then that would be when they stopped. Not all of us have ca-125 in the normal zone. It all depends on how sensitive you are to the test..how much protein your cells put out. I have several friends with numbers in the hundreds with no sign of disease present and hence are not on chemo. All of us are different and so are out Dr.s. and their treatments. Good luck---hope you get a break soon!~~~~Joanne

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I get a cat scan every 6 months. That's what my oncologist ordered.
I wasn't due for one until the middle of July but gut feeling told me to ask for one sooner so we did one in June and sure enough, there was a small spot on my liver. I started chemo again right away and after 3 treatments a new scan shows it's gone. I had a treatment the day I got my results and I'm scheduled for 2 more, then another scan.

Please know that I'm keeping you in my thoughts and prayers.

Take care & God Bless

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Nancy, I had a CT every 3 months while on chemo ( for 16 months ) Since stopping chemo I believe the protocol says 1 CT every 3 months for the first 2 yrs. Then every 6 months for 2 yrs then every year unless signs and symptoms appear sooner. Jan

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Usually they will stop chemo once your CA-125 is in the normal range (under 30 for normal or under 20 for super normal). There must be a reason why your onc. wants it to go to 7, but that sounds lower than necessary. At some point, they do like to get you off chemo.

Re CT scans, I have gotten them at diagnosis, and at a recurrence and following treatment for the recurrence, along with a PET to be sure what remained was scar tissue (it was).

I think it's individual. A friend of mine with a different cancer gets the scans every 6 months and she asked me why I did not. So I asked my onc. and he said since my numbers were low and I go for regular checkups, he doesn't want to expose me to radiation unnecessarily. If something comes up, we do it. I'm fine with that. I think we sometimes forget how much radiation we are exposed to with all the scans and x-rays in our lives.

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To Favorite Aunt, You've made me really stop and think.
I have been thinking that it has been an excessively
long period to receive chemo when my numbers never
went under 60. My last ca-125 was 38. I think this should be
good enough and I should be given a break. I am starting
to wonder if I should get another second opinion. Maybe
my dr is just chemo happy.

I have been receiving chemo for a year and a half. It is
making me crazy. I was terminated from my job and my
whole life is centered around chemo. He did just give
me a 6 week break but I had to ask for it.

I am worried now. What should I do? Nancy

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Let your doctor know about the bloating, you may have some fluid that needs to be drained. I gain weight by looking at food since all of the steroids they had me on to avoid chemo side effects (which I got anyway). I have been careful about sugar, salt and alcohol, all make me blow up like a balloon. It's really hard, because when you are on chemo and feel like ...... you want comfort foods, but I try to eat lots of vegetables, fruits and whole grains, very little fat. I finished chemo in May and have lost 20 lbs but can't seem to lose any more. I guess I should just be happy to be here after three times of chemo. My doc is having me get CT's every three months, but nothing shows up. My CA125 usually goes up, but not that much. At my worse it was 94 and best it was 9. My doctor says anything under 25 is normal.
I wish you all the best!

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I like the term fluffy.I am fluffy.I had gained some weight over the years and was on a health kick while trying to get diagnosed .Then I could eat a dozen donuts every 6 hrs. and still lose weight the last 3 months . I went from my comfortable 155 to 122 in those 3 months,eating everything I could stuff in my mouth.Then surgery & chemo & 113 and steroids and eat ,eat . Then no chemo and 4 surgeries latter and I am fluffy. What I have seemed to notice is weight distributed may not be a serious prob, weight concentrated is something you & your Dr. need to discuss.As women we get so involved in our body image ,hair no hair ,skinny not, fluffy not.Stupid story here my youngest and I were discussing a young woman who's suing here Plastic Surgeon for messing up her little toes ,that now lay over her other toe. She had gone in to have her feet reshaped so they looked better in her heeled sandals.We are certainly not what others see in their reality,but more. I am not the body you see I am the soul I share .I am a great bottle of aged brandy the bottle is dusty and chipped but inside I am sweet and hot and smooth .I am something to celebrate good times with,and cry with and laugh and live with .May you all be aged wine not vinegar, in dusty bottles who celebrate the art of living.Luv ya God bless

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Nancy,
I am amazed at the difference in treatment plans and schedules. I have essentially been receiving scans every 3 months, sooner if I had any suspicious findings or test results. Occasionally I will have an MRI or PET scan, or ultrasound as well as my usual mammogram. While it is difficult to imagine you must stay on top of all your medical conditions while dealing with your ovarian cancer. Ask your gyn/onc if he/she has a schedule to follow. This way you can remind him/her when you are due.
Lily

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Nancy,
I understand your frustration about wanting to get off chemo. A reading of 38, for someone who never went below 60 on chemo, is probably higher than they would like. Maybe it is "close enough" to the 30 level, but you should have a heart-to-heart with your onc. about what the plan is.

If you have strong doubts, you should definitely pursue a second opinion. They could tell you the same thing, but at least you'll feel more confident about it. It's so hard because being on chemo so long is awful. Don't give up though. Someone I know of is Stage IV and was told she would be on chemo indefinitely (at Sloan Kettering). Well guess what? Her numbers are good, she's been off it for months and traveling and having fun. You really never know, so don't give up. I hope you get some satisfaction and enjoy that break you asked for! All the best.

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Nancy,
Unfortunately, there is no correct answer to how often to have a CT scan. About a year ago my gyn-onc told me I should wait six months before my next scan, and within one month I decided I needed to know what was going on inside me, and I went to another gyn-onc who ordered a PET/CT scan, which showed hypermetabolic activity in several peri-aortic lymph nodes. Looking back, I will never know whether I should have just enjoyed life and not pursued an aggressive treatment for the next five months, which caused severe side effects and proved not to be effective. No one knows what will work and what won't, and second guessing doesn't help. For me, knowing what's going on inside is better than not knowing, but another woman in my situation might be more comfortable and less anxious with longer intervals between CT scans (I have one every three months, and like knowing the progression is very slow, but there IS progression of my tumors.)

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I had one CT Scan before I was diagnosed, and then I didn't have another until 4 months after the completion of chemo. But, my surgery was optimal and after surgery my CA-125 was 16 and then dropped further ( to 6 ) with chemo. Since I appeared to in remission, there was no need for a CT Scan. My doctor told me that he does them once a year, or if there are signs of a recurrence, whichever comes first. However, I would prefer not have any unless there are signs of a recurrence because CT Scans give off 100 times the radiation of an X-ray and can actually cause cancer. If you have active disease that needs to be monitored, then the benefit of a CT Scan far outweighs the risk. But, in my opinion, if you are in remission ( good physical exam, no symptoms, low CA-125, normal blookwork ), the CT Scan should be delayed as long as possible.

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I have a CTscan every three cycles of chemotherapy to monitor its progression.
After each 3 cycles I am also in for an MRI so they can watch it closely.
But I don't have ovarian cancer... I have Brain cancer.....
Hope this helps?

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CA 125 is not a marker for me as a monitoring tool. After finishing chemo and surgery a year ago, I have CT scans every 2-3 months to monitor the disease in a "watch and wait" mode.

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kla,

I loved your description of who you are. I am going to have to think about how I would describe myself. I don't think I am going to achieve your level! :)

I have cat scans every 3 months. I do worry about all the radiation I am getting to achieve a look at what is going on. I wish they could come up with something else.

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Hi Everyone! I am in disbelief that this discussion came back after I posted it a year ago. Now I am 45
and I have been getting chemo for 2 years and 6
months. I feel exactly the same bad way about myself
and I haven't lost any weight. I did have a CT scan
in June when I was hospitalized with Colitis. It was
negative. So that felt good. My dr continues to
push chemo. My tumor marker was last 132 but
then It went down a bit. I am now getting Gemzar.
I really will think seriously about getting a second
opinion. Thanks for all your comments. But one
thing is good since last year September. I am still
alive. Yeah!

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We don't talk about this much, but chemo can also cause cancer. I'd definitely go for a second opinion.

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Verlinda,
Acute Leukemias (AML and ALL) are the cancers most related to prior chemotherapy-- 10% of these leukemias can be liked to prior chemotherapy.
There are also cancers that are linked to having a risk of a second cancer not related to chemotherapy. I found it to be very interesting what other cancers are linked to Ovarian cancer.

Second Cancers Caused by Cancer Treatment

Advances in radiation therapy and chemotherapy have increased the chances of survival for people with cancer today. People with cancer are living longer, so it's becoming more important to study the long-term effects of cancer treatment. Of all the possible late complications of cancer treatment, developing a second cancer is one of the most serious.

People can have more than one cancer in their lifetime. Cancer is a very common disease, and not all second cancers are due to cancer treatment. For example, certain inherited gene changes can increase a woman's risk for both breast and ovarian cancer. Also, being exposed to certain cancer- causing substances, like tobacco smoke, can put a person at higher risk for several different cancers, such as cancers of the lung, larynx, throat, or mouth. Even though it is hard to separate out the exact cause of any one person's cancer, here we will try to focus on the risk of second cancers that may be linked to past cancer treatment.

The National Cancer Institute has sponsored several clinical trials related to the long-term effects of cancer treatment. These are helping us to better understand how cancer treatments can affect the development of second cancers.

Treatments linked to the development of second cancers

Radiation therapy

Radiation therapy was recognized as a potential cause of cancer many years ago. In fact, much of what we know about radiation therapy has come from studying survivors of atomic bomb blasts in Japan. We also have learned from workers in certain jobs that included radiation exposure, and patients treated with radiation therapy for cancer and other diseases.

Acute myelogenous leukemia (AML), chronic myelogenous leukemia (CML), and acute lymphoblastic leukemia (ALL) have been linked to past radiation exposure. The risk of leukemia after radiation treatment depends on a number of factors such as:

* how much of the bone marrow was exposed to radiation
* the amount of radiation that reached active bone marrow
* the radiation dose rate

The person's age when they were treated with radiation does not seem to be a risk factor. Most cases usually develop within a few years of radiation treatment, peaking at 5 to 9 years after exposure. Then the number of cases developing slowly declines over the following years.

In contrast, other cancers, which are mostly solid tumors, have been shown to take much longer to develop. Most of these cancers are not seen for 10 years after radiation therapy and some are diagnosed even more than 15 years later. The effect of radiation on the risk of developing a solid tumor cancer depends on such factors as:

* the dose of radiation
* the area treated
* the age of the patient when they were treated with radiation

In general, the risk of developing a solid tumor after radiation treatment goes up as the dose of radiation increases. Some cancers require larger doses of radiation than others, and certain techniques require more radiation. For example, intensity modulated radiation therapy (IMRT) helps to protect tissues that are more easily injured by radiation, but a larger dose of radiation overall must be used.

The area treated is also important, since these cancers tend to develop in or near the area that was treated with radiation. Certain organs, such as the breast and thyroid, seem to be more likely to develop cancers after radiation than others.

Age at the time of treatment also affects risk. For example, the risk of developing breast cancer after radiation is higher in those who were treated when they were young compared with those given radiation as adults. The chance of developing breast cancer after radiation seems to be highest in those exposed as children. Risk decreases as the age at the time of radiation increases, with little or no increase in breast cancer risk among women who had radiation after the age of 40. Age at the time of radiation treatment has a similar effect on the development of other solid tumors, including lung cancer, thyroid cancer, bone sarcoma, and gastrointestinal or stomach cancers.

Other factors can also affect the risk of radiation-related cancers. Smoking, for example, increases the risk of lung cancer after radiation even more. Early menopause can lower the risk of radiation-related breast cancer. For some cancers, the risk is higher if chemotherapy was given along with radiation.

More research will probably be done in the future to look at how genetics and radiation therapy interact, as well as the link between radiation therapy and other cancer-causing agents.

Chemotherapy

The cancer most often linked to chemotherapy as the cause is a type of leukemia called acute myelogenous leukemia (AML). Acute lymphocytic leukemia (ALL) is also a chemotherapy-related cancer and may make up about 5% to 10% of acute leukemias caused by chemotherapy.

Chemotherapy is known to be a higher risk factor than radiation therapy in causing leukemia. Studies of patients treated in the 1970s and 1980s have shown an increased risk of AML after certain types of chemotherapy drugs called alkylating agents were used to treat cancers like Hodgkin disease, non-Hodgkin lymphoma (NHL), ovarian, lung, and breast cancer.

Alkylating agents known to cause leukemia include:

* mechlorethamine
* chlorambucil
* cyclophosphamide (Cytoxan®)
* melphalan,
* semustine,
* lomustine (CCNU),
* carmustine (BCNU),
* prednimustine,
* busulfan,
* dihydroxybusulfan.

The risk gets higher with higher drug doses, longer treatment time, and higher dose-intensity (meaning that more drug is given over a short period of time). Studies have shown that leukemia risk begins to rise about 2 years after treatment with alkylating agents, becomes highest after 5 to 10 years, and then the risk decreases. Leukemia that develops after treatment with alkylating agents can be hard to treat and tends to have a poor outcome.

The chemotherapy drug cisplatin is not an alkylating agent, but it attacks cancer cells in much the same way. Cisplatin seems to increase the risk of leukemia, too. This leukemia is hard to treat and tends to have a poor outcome, much like the leukemia linked to the alkylating agents. But the risk of developing leukemia after treatment with cisplatin is not as great as with the alkylating agents. Cisplatin is used to treat a lot of different cancers, including lung, testicular, and ovarian cancer. The risk of leukemia rises as the amount of drug used gets higher. The risk of developing leukemia increases even more if radiation is given along with the cisplatin.

In more recent years, drugs that are topoisomerase II inhibitors have also been found to cause leukemia, mainly AML. Drugs in this class include etoposide, teniposide, and mitoxantrone. Leukemia develops sooner after treatment with these drugs, than the leukemia from alkylating agents. Most cases are found within 2 or 3 years of treatment. Etoposide (VP-16, Etopophos®, or Vepesid®) is used to treat patients with non-small cell lung cancer, testicular cancer, and ALL, and is linked with an increased risk of developing AML. Treatment of childhood ALL with teniposide is also thought to increase the risk of AML. Mitoxantrone (Novantrone®), used to treat breast cancer and lymphoma, can also cause acute leukemia. Leukemia from these drugs acts differently from the leukemia from alkylating agents -- it responds to treatment better and has a better outlook.

More recently, evidence has suggested that the class of chemotherapy drugs called anthracyclines may also cause AML. Examples of anthracyclines include the drugs doxorubicin (Adriamycin®), daunorubicin, and epirubicin (Ellence®). These drugs are also topoisomerase II inhibitors, but are less likely to cause leukemia than etoposide, teniposide, and mitoxantrone.


Cancers linked to the development of second cancers

No matter what type of cancer is treated, treatments such as radiation and chemotherapy can lead to a second cancer in the long run. Because it can take many years for treatment-related cancers to develop, they have been studied best in those who have lived a long time after being treated. Successfully treating a first cancer gives a second cancer the time (and the chance) to develop. The cancers discussed in this section were some of the first cancers in which treatment led to long-term survival. It is likely that we will see second cancers developing after some other cancers as treatment and survival improves.

Hodgkin disease

Survivors of Hodgkin disease (HD) have a risk of developing another cancer that is more than 3 times that of people who didn't have HD (the general population). Overall, the risk of a second cancer is more than 20% (1 in 5) in the first 20 years after treatment.

An increased risk of acute leukemia has been seen in HD patients treated with chemotherapy. This is especially true if an alkylating agent was used, for example, in the combination of drugs known as MOPP [mechlorethamine, vincristine (Oncovin®), prednisone, and procarbazine]. Leukemia is much less common in people treated with the combination known as ABVD [doxorubicin (Adriamycin®), bleomycin, vinblastine, and dacarbazine]. Treating HD with radiation alone has little effect on leukemia risk, but adding radiation to MOPP chemotherapy increases the risk further. The chance of getting leukemia after HD is related to the patient's age when they were treated, with the highest risk seen in those treated after age 40. The risk also seems to go up as the amount of chemotherapy used increases.

The risk of non-Hodgkin lymphoma (NHL) is also higher in those who survive HD. Because this risk does not seem to change based on the type of treatment used, many experts do not think that NHL seen after HD is caused by cancer treatments.

Radiation therapy for HD has been linked to an increased risk of developing solid tumor cancers. The risk is highest in the areas that were in the path of the radiation beam. The most common second cancer in female survivors of HD is breast cancer. The risk is highest in those who had radiation to an area in the center of the chest called the mediastinum before age 30. (The mediastinum is the area between the lungs where the heart and its vessels, the trachea, the esophagus, the thymus, and some lymph nodes are found.) Early in the treatment of HD, many patients got radiation to the mediastinum as a part of mantle field radiation. (Mantle field radiation covers the area of the neck, chest, and armpits.) Some patients also went into early menopause from radiation or alkylating agent chemotherapy. In women who went through menopause before age 40 because of HD treatment, the risk of breast cancer went down.

Lung cancer risk is also higher after treatment for HD. This higher risk is related to chest radiation treatments as well as chemotherapy with alkylating agents. Patients who have both chemotherapy and radiation are even more likely to develop lung cancer. Smoking further increases the risk. The risk of lung cancer goes up if the patient smoked before treatment, but the risk gets even higher if the patient keeps on smoking after radiation therapy.

The risk of thyroid cancer is also increased in HD patients who were treated with radiation to the neck. Other cancers that are seen after radiation include gastrointestinal (stomach) cancer and sarcoma.

Over time, treatment for HD has changed. Chemotherapy with alkylating agents has become much less common, and when radiation is needed, lower doses are used. These changes seem to have helped lower the cancer risks after treatment, but long-term follow-up studies are still needed.

Follow-up care

Since there is an increased risk for a second cancer following treatment for Hodgkin disease, survivors of HD should be carefully followed up. Your doctors should look for the development of solid tumors, leukemia, and non-Hodgkin lymphoma along with recurrence of Hodgkin disease.

All patients should be encouraged to reduce their risk of lung cancer by avoiding tobacco smoke. Women who were treated with radiation to the chest (such as mantle field radiation therapy) before age 35 should start breast cancer screening early. There are no standard guidelines, but many experts recommend that patients treated with this type of radiation start screening 5 to 8 years after finishing their HD treatment. This screening should include regular breast exams and mammograms. Breast MRI (magnetic resonance imaging) could also be helpful.

Patients who had radiation to their abdomen (belly) should pay special attention to any abdominal problems and report them to the doctor right away. Problems like unplanned weight loss, ongoing diarrhea, or other bowel problems could be a sign of a serious condition.

Non-Hodgkin lymphoma

Survivors of non-Hodgkin lymphoma (NHL) are at increased risk of developing some second cancers, but less so than patients who were treated for Hodgkin disease. Overall, NHL survivors get new cancers about 15% more often than most people (the general population). Increased risks of malignant melanoma, lung cancer, and kidney cancer have been seen in patients who had been treated for NHL.

Survivors of NHL are also at risk for several other cancers such as:

* Kaposi sarcoma
* cancers of the head/neck area (this includes the tongue, floor of the mouth, throat, and voice box)
* colon cancer
* thyroid cancer
* bone and soft tissue cancer
* bladder cancer
* leukemia
* Hodgkin disease

Radiation therapy increases the risk of breast cancer in women who were treated before age 25. Mesothelioma, a rare cancer of the outer lining of the lung, is also increased in those who were treated with radiation.

A higher risk of bladder cancer has only been seen in those who were treated with chemotherapy. The drug cyclophosphamide (Cytoxan®), especially if used in higher doses, is linked to bladder cancer.

Low-dose total body irradiation (TBI), which was once used to treat NHL, has been linked to an increased risk of leukemia. The risk of leukemia is also higher in those treated with chemotherapy, with the highest risk seen in those treated with both radiation and chemotherapy.

Patients who had autologous bone marrow transplants (meaning the patient's own bone marrow was used -- not someone else's) are also at increased risk for developing acute myelogenous leukemia (AML) and an early form of leukemia called myelodysplastic syndrome (MDS).

Treatment-related second cancer risk lasts a long time after NHL, up to 30 years after diagnosis. Those who were diagnosed and treated at younger ages (20 years old and younger) have a higher risk than those who were older (70 or older) when they were found to have NHL.

Follow-up care

Since there is an increased risk for a second cancer following treatment for NHL, survivors should get careful follow-up. Your doctors should be looking for the development of any of the above mentioned cancers as well as the recurrence of NHL.

All patients should be encouraged to avoid tobacco smoke.

Prostate cancer

Men who are treated for prostate cancer with surgery or radiation therapy actually have a lower risk of cancer as they get older because prostate cancer is so common in older men. Men whose prostates have been removed or destroyed with radiation can no longer get a new case of prostate cancer, but they can get recurrence of the original prostate cancer if any of the prostate tissue remains.

But men who are treated with radiation therapy, either with seed implants (brachytherapy) or external beam radiation therapy, have a higher risk of bladder cancer later on than men who had surgery to remove their prostates. They may also have a higher risk for rectal cancer. Men who had seed implants without external radiation have a slightly lower risk than those who had external beam radiation. The risk is likely related to the dose of radiation, as it is with other cancers. Men who get seed implants typically get less radiation to nearby organs than those who get EBRT, either by itself or along with seeds. Risk can continue for more than 10 years after treatment.

Follow-up care

Survivors who are treated with radiation have an increased risk of certain second cancers, so they should get careful follow-up. There are no special recommendations for watching for second cancers after prostate treatment at this time. Still, your doctor will be watching for recurrence of the prostate cancer. Men who have had radiation to treat prostate cancer should be careful to follow screening recommendations for colorectal cancer to improve the chance of early detection. You should also report blood in your urine, rectal pain, or rectal bleeding to your doctor right away.

All patients should be encouraged to avoid tobacco smoke. Men who smoke may further increase their risk of bladder cancer after prostate radiation, since smoking is a known risk factor for bladder cancer.

Testicular cancer

The most common cancer seen in testicular cancer survivors is a second testicular cancer. Overall, 2% to 5% of men who have had cancer in 1 testicle will eventually have it in the other testicle. The second cancer is not from treating the first cancer with radiation or chemotherapy. In fact, those treated with surgery alone still have an increased risk of a second testicular cancer. Also, the chance of getting a second testicular cancer is actually lower in men who were treated with chemotherapy. The rest of this section is about second cancers other than testicular cancer.

Patients treated for testicular cancer have less than one-half the risk of second cancers than those treated for Hodgkin disease. Compared with most people (the general population), testicular cancer survivors are up to twice as likely to develop a new cancer outside the testicle. The chance of a second cancer goes up over time and also depends on which treatments were used.

The risk of a solid tumor cancer starts going up within 5 years and doubles after 10 years in those men who were treated with radiation alone. This risk remains high for more than 35 years after treatment. The most common cancers seen after abdominal radiation for testicular cancer are cancers of the bladder, colon, pancreas, and stomach. Radiation to the abdomen also increases the risk of cancers of the rectum, kidney, and prostate. If the radiation field includes the chest (or the part called the mediastinum), the risks of lung cancer and thyroid cancer are increased. (The mediastinum is the middle part of the chest, which contains the heart and its vessels, the trachea, the esophagus, the thymus, and some lymph nodes.) Radiation treatments also increase the risk of melanoma skin cancer and connective tissue cancer (sarcoma). The risks are generally greater with higher radiation doses or if the patient got both chemotherapy and radiation.

In recent years, radiation therapy for testicular cancer has changed. Lower doses of radiation are used, and preventive treatment to the mediastinum has been stopped. Long-term follow-up studies are needed to see if these changes have lowered the cancer risks.

Chemotherapy is linked with an 80% increased risk of solid tumor cancers -- slightly less than what is seen after radiation. The risk of leukemia after treatment for testicular cancer is also increased. Most cases are linked to the chemotherapy drugs cisplatin and etoposide (VP-16, Etopophos®, or Vepesid®). Higher doses of these drugs have a higher risk of leukemia. Leukemia is normally a rare cancer, so even though the risk of leukemia after testicular cancer is higher than average, very few patients develop leukemia from their treatment.

Follow-up care

Because the most common cancer seen is a second testicular cancer, survivors should perform regular testicular self-exams. They should see a doctor at least once a year or sooner if any problems develop.

All patients should be encouraged to avoid tobacco smoke.

Ovarian cancer

The risk of second cancers in ovarian cancer survivors includes melanoma of the eye; cancers of the colon, rectum, breast, and bladder; and leukemia. Radiation therapy is linked with cancers of connective tissues, bladder, and possibly pancreas cancer. Chemotherapy is linked with an increased risk for leukemia. Reproductive and genetic factors that may have caused ovarian cancer in the first place may also add to the risk of breast and colorectal cancers and possibly ocular melanoma. Studies have shown that the risk of developing solid tumors was higher during all follow-up periods, including 10 to 14 years after ovarian cancer. Fifteen-year survivors had significant increases in cancer of the pancreas, bladder, and connective tissue.

Follow-up care

Women who have had ovarian cancer will be watched closely for signs that the cancer has come back with regular physical exams, blood tests, and, sometimes, CT scans. These women have an increased risk of breast and colorectal cancers and should have regular screening for these cancers.

All patients should be encouraged to avoid tobacco smoke.

Breast cancer

Many studies have shown that women with breast cancer are at a 3-to 4-fold increased risk of developing a new primary cancer in the opposite breast. Increased risk is also seen for cancers of the ovary, uterus, lung, colon, rectum, and connective tissue, as well as melanoma and leukemia. But for some of these cancers, such as cancer of the opposite breast, ovary, and uterus, the second cancer may be linked to the same thing that caused the first cancer, like genetics or a hormonal risk factor.

The most common second cancer seen in survivors of breast cancer is a new cancer in the other breast. The risk of a second breast cancer is high no matter what treatment is used for the first cancer. Even people who receive no radiation or chemotherapy have an increased risk of cancer in the opposite breast. This increase in risk also shows up in close relatives of women with breast cancer, so there may be a shared pre-existing factor causing the first and second breast cancers in many of these women. Still, depending on the patient's age when they were treated, radiation therapy can increase the risk even more. Radiation therapy does not seem to increase the risk of cancer in the opposite breast if the patient is past the age of 45 at the time of treatment. But in women who had radiation therapy before the age of 45, an increased risk is seen 10 years after treatment.

The risk of lung cancer is also increased in women who had radiation therapy for breast cancer. The higher lung cancer risk is first seen 10 years after radiation, and gets higher over time. The risk of lung cancer after radiation is even higher in women who smoke. Radiation therapy to the breast also increases the risk of sarcomas of blood vessels (angiosarcomas), connective tissue, and bone (osteosarcomas). These cancers are most often seen in the remaining breast area, chest wall, and the arm that had been treated with the radiation therapy. This risk remains high even 30 years after treatment.

Taking tamoxifen for 5 years not only makes it less likely that the first cancer will come back, it also helps to lower the risk of cancer in the opposite breast by 50%.This appears to be true for women who have been followed for 10 years after their first treatment. But tamoxifen increases the risk for endometrial cancer in 5-year and 10-year survivors. Still, the benefits of treatment for breast cancer are greater than the risk of a second cancer.

There is a small risk of developing leukemia after treatment for breast cancer. The risk is highest when both chemotherapy and radiation therapy are given, especially if the chemotherapy includes an alkylating agent (see the list of alkylating agents above). Cyclophosphamide (Cytoxan®), an alkylating agent, has been used for over 30 years to treat breast cancer. It is a part of the regimen CMF [cyclophosphamide, methotrexate, and 5-FU], and is also included in the regimens AC [Adriamycin® (doxorubicin) and cyclophosphamide] and FAC (adds 5-fluorouracil or 5-FU to the drugs in AC). Studies have shown that higher doses of cyclophosphamide (Cytoxan®) increase the risk of developing AML. The dose of cyclophosphamide that is now used in standard CMF and AC is linked with a low risk of leukemia, but higher doses increase the leukemia risk. The risk also goes up with dose intensity (when a higher amount of drug is given over a shorter amount of time). Still, even with a risk of leukemia that is several times higher than what is usually seen, those who received 4 times the regular dose of cyclophosphamide had a risk of leukemia that was only about 1%.

Follow-up care

Even women who were not treated with radiation have an increased risk of a second cancer in the opposite breast. Follow-up care should include annual screening for breast cancer (if there is any remaining breast tissue). Good gynecologic care is also important to watch for endometrial cancer.

All patients should be encouraged to avoid tobacco smoke.

Cervical cancer

Cervical cancer is often caused by infection with human papilloma virus (HPV). Survivors of cervical cancer have an increased risk for other HPV-related cancers, including cancers of the throat, anus, vulva, and vagina. Survivors of cervical cancer also have an increased risk of some cancers linked to smoking, such as lung cancer, bladder cancer, and pancreatic cancer. The risks of bladder and lung cancer are even higher in those women who were treated with radiation. Radiation for cervical cancer also increases the risk of cancers of the colon, rectum, soft tissue, and stomach. Radiation is also linked to a higher risk of acute leukemia and non-Hodgkin lymphoma.

Follow-up care

Survivors of cervical cancer need good gynecologic care to watch for signs of a new cancer in the vulva or vagina, as well as to watch for relapse.

All patients should be encouraged to avoid tobacco smoke.

Childhood cancers

Researchers have learned that the effects of childhood cancer treatment may affect that child's health later in life. This result is known as a "late effect." For more information about this topic, see our document, Childhood Cancer: Late Effects of Cancer Treatment.

Summary

The risk of second cancers must always be weighed against the benefits gained with treatment. The risks of treatments should always be compared carefully against the cost of not using such treatments. For many new cancer treatments, the long-term effects that cause second cancers are not yet known. The need for ongoing follow-up of cancer survivors is important so that we can better understand the long-term effects of cancer treatments.


source:http://www.cancer.org/docroot/MBC/content/MBC_2X_Second_Cancers_Caused_By_C ancer_Treatment.asp

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Very informative. Thanks!

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