Streptozocin

(strep toe ZOE sin)

Trade names: Zanosar^®

Drug type:  Streptozocin is an anti-cancer ("antineoplastic" or "cytotoxic") chemotherapy drug.  This medication is classified as an "alkylating agent."  (For more detail, see "How this drug works" section below).

What This Drug Is Used For:

• Treatment of islet cell cancer of the pancreas
• Carcinoid tumor and syndrome

Note:  If a drug has been approved for one use, physicians may elect to use this same drug for other problems if they believe it may be helpful.

How This Drug Is Given:

• As an infusion into the vein (intravenous, IV).
• Streptozocin is a vesicant.  A vesicant is a chemical that causes extensive tissue damage and blistering if it escapes from the vein.  The nurse or doctor who gives this drug must be carefully trained.  If you notice pain, redness or swelling at the IV site while you are receiving streptozocin, alert your health care professional immediately.
• The amount of streptozocin that you will receive depends on many factors, including your height and weight, your general health or other health problems, and the type of cancer or condition being treated.  Your doctor will determine your dose and schedule.

Side Effects:

Important things to remember about the side effects of streptozocin:

• Most people do not experience all of the side effects listed.
• Side effects are often predictable in terms of their onset and duration. 
• Side effects are almost always reversible and will go away after treatment is complete.
• There are many options to help minimize or prevent side effects.
• There is no relationship between the presence or severity of side effects and the effectiveness of the medication.

The following side effects are common (occurring in greater than 30%) for patients taking streptozocin:

• Nausea and vomiting.  This may begin from 1 to 3 hours after you receive the injection, and last up to 12 hours. You will be given anti-nausea medication prior to receiving this drug.
• This drug may affect your kidneys. (see kidney problems, nephrotoxicity) Your kidney function will be closely monitored.

These side effects are less common side effects (occurring in about 10-29%) of patients receiving streptozocin:

• Diarrhea
• Low blood sugar (see blood test abnormalities). This is an uncommon side effect, however if you are on medication for diabetes, some adjustment to your medications may be needed.  
• Low white blood cell (WBC), hemoglobin (Hgb) and platelet counts may occur, although uncommon. This may put you at risk for infections, tiredness, and bleeding. You can expect bone marrow depression (decreased blood counts) to occur.

Nadir: Meaning low point, nadir is the point in time between chemotherapy cycles in which you experience low blood counts.

Onset: 7 days
Nadir: 14 days
Recovery: 21 days

• Increases in blood tests measuring liver function.  These return to normal once treatment is discontinued (see liver problems).

Delayed effects:
There is a slight risk of developing a blood cancer such as leukemia after taking streptozocin.  Talk to your doctor about this risk.

Not all side effects are listed above. Some that are rare (occurring in less than 10% of patients) are not listed here.  However, you should always inform your health care provider if you experience any unusual symptoms.

When to contact your doctor or health care provider:

Contact your health care provider immediately, day or night, if you should experience any of the following symptoms:

• Fever of 100.4° F (38° C) or higher, chills (possible signs of infection)

The following symptoms require medical attention, but are not an emergency.  Contact your health care provider within 24 hours of noticing any of the following:

• Nausea (interferes with ability to eat and unrelieved with prescribed medication)
• Vomiting (vomiting more than 4-5 times in a 24 hour period)
• Diarrhea (4-6 episodes in a 24-hour period)
• Unusual bleeding or bruising
• Black or tarry stools, or blood in your stools or urine
• Extreme fatigue (unable to carry on self-care activities)
• No urination in a 12 hour period.  Swelling of the feet or ankles, sudden weight gain
• Yellowing of the skin or eyes
• Signs of infection such as redness or swelling, pain on swallowing, coughing up mucous, or painful urination.
• Unable to eat or drink for 24 hours or have signs of dehydration: tiredness, thirst, dry mouth, dark and decrease amount of urine, or dizziness.
• Increased thirst, drinking and urination, waking up at night to urinate.

Always inform your health care provider if you experience any unusual symptoms.

Precautions:

• Before starting streptozocin treatment, make sure you tell your doctor about any other medications you are taking (including prescription, over-the-counter, vitamins, herbal remedies, etc.).   Do not take aspirin, or products containing aspirin unless your doctor specifically permits this.
• Do not receive any kind of immunization or vaccination without your doctor's approval while taking streptozocin.
• Inform your health care professional if you are pregnant or may be pregnant prior to starting this treatment.  Pregnancy category D (streptozocin may be hazardous to the fetus.  Women who are pregnant or become pregnant must be advised of the potential hazard to the fetus).
• For both men and women: Do not conceive a child (get pregnant) while taking streptozocin. Barrier methods of contraception, such as condoms, are recommended. Discuss with your doctor when you may safely become pregnant or conceive a child after therapy.
• Do not breast feed while taking this medication.

Self-Care Tips:

• Apply ice if you have any pain, redness or swelling at the IV site, and notify your doctor.
• Drink at least two to three quarts of fluid every 24 hours, unless you are instructed otherwise.
• Wash your hands often.
• To help treat/prevent mouth sores, use a soft toothbrush, and rinse three times a day with 1/2 to 1 teaspoon of baking soda and/or 1/2 to 1 teaspoon of salt mixed with 8 ounces of water.
• Use an electric razor and a soft toothbrush to minimize bleeding.
• Avoid contact sports or activities that could cause injury.
• To reduce nausea, take anti-nausea medications as prescribed by your doctor, and eat small, frequent meals.
• You may experience drowsiness or dizziness; avoid driving or engaging in tasks that require alertness until your response to the drug is known.
• Avoid sun exposure.  Wear SPF 15 (or higher) sunblock and protective clothing.
• In general, drinking alcoholic beverages should be kept to a minimum or avoided completely.  You should discuss this with your doctor.
• Get plenty of rest. 
• Maintain good nutrition.
• If you experience symptoms or side effects, be sure to discuss them with your health care team.  They can prescribe medications and/or offer other suggestions that are effective in managing such problems.

Monitoring and Testing:

You will be checked regularly by your health care professional while you are taking streptozocin, to monitor side effects and check your response to therapy.  Periodic blood work to monitor your complete blood count (CBC) as well as the function of other organs (such as your kidneys and liver) will also be ordered by your doctor.   

How This Drug Works:

Cancerous tumors are characterized by cell division, which is no longer controlled as it is in normal tissue.   "Normal" cells stop dividing when they come into contact with like cells, a mechanism known as contact inhibition.  Cancerous cells lose this ability.  Cancer cells no longer have the normal checks and balances in place that control and limit cell division.  The process of cell division, whether normal or cancerous cells, is through the cell cycle.  The cell cycle goes from the resting phase, through active growing phases, and then to mitosis (division).

The ability of chemotherapy to kill cancer cells depends on its ability to halt cell division.  Usually, the drugs work by damaging the RNA or DNA that tells the cell how to copy itself in division.  If the cells are unable to divide, they die.  The faster the cells are dividing, the more likely it is that chemotherapy will kill the cells, causing the tumor to shrink.  They also induce cell suicide (self-death or apoptosis).

Chemotherapy drugs that affect cells only when they are dividing are called cell-cycle specific.  Chemotherapy drugs that affect cells when they are at rest are called cell-cycle non-specific.  The scheduling of chemotherapy is set based on the type of cells, rate at which they divide, and the time at which a given drug is likely to be effective.  This is why chemotherapy is typically given in cycles.

Chemotherapy is most effective at killing cells that are rapidly dividing.  Unfortunately, chemotherapy does not know the difference between the cancerous cells and the normal cells. The "normal" cells will grow back and be healthy but in the meantime, side effects occur.  The "normal" cells most commonly affected by chemotherapy are the blood cells, the cells in the mouth, stomach and bowel, and the hair follicles; resulting in low blood counts, mouth sores, nausea, diarrhea, and/or hair loss.  Different drugs may affect different parts of the body.

Streptozocin is classified as an alkylating agent.  Alkylating agents are most active in the resting phase of the cell.  These drugs are cell cycle non-specific.  There are several types of alkylating agents.

• Mustard gas derivatives:  Mechlorethamine, Cyclophosphamide, Chlorambucil, Melphalan, and Ifosfamide. 
• Ethylenimines:  Thiotepa and Hexamethylmelamine.
• Alkylsulfonates:  Busulfan.
• Hydrazines and Triazines: Altretamine, Procarbazine, Dacarbazine and Temozolomide. 
• Nitrosureas:  Carmustine, Lomustine and Streptozocin.  Nitrosureas are unique because, unlike most chemotherapy, they can cross the blood-brain barrier.  They can be useful in treating brain tumors.
• Metal salts:  Carboplatin, Cisplatin, and Oxaliplatin.

Note:  We strongly encourage you to talk with your health care professional about your specific medical condition and treatments. The information contained in this website is meant to be helpful and educational, but is not a substitute for medical advice.

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