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The Voice of People With Breast Cancer


Our Voices Blog

The Impact of COVID-19 on Breast Cancer Patients Part 2: Impact of Your Cancer Treatment and Management on Your Immune System

The risk of a COVID-19 diagnosis for breast cancer patients is still not completely known. Studies have been done that show that cancer patients are more at risk of adverse effects if they develop COVID-19. However, a few studies state that compared to other cancer patients, breast cancer patients are at a lower risk of serious illness. The stage of breast cancer also seems to play a role in one’s risk level.

The reason that cancer patients have been identified as high-risk is because they are immunocompromised. As breast cancer patients, you may worry about how your cancer diagnosis can, or has, impacted your immune system. In this blog, we provide information as to how various cancer treatments can impact your immune system. Although breast cancer itself may not directly compromise your immune system in the same way that blood cancer might, the type of treatment you have gotten might be the cause of a weakened immune system.1 The information provided is based on what is currently available and unfortunately there is limited data regarding how long certain treatments weaken your immune system.

With provinces and territories re-opening businesses and services, you might be concerned of what that means for you as a breast cancer patient. We hope that this serves as a way to give you insight on the impact of your cancer treatment and management on your immune system. Remember that this is a general guide and the best way to properly assess your risk level for COVID-19 is to speak to your primary care team. They will be able to provide you with a more individualized answer.


  • Impact on your immune system depends on 1:
    • Type and stage of cancer
    • Chemo drugs that are used
    • Dose and frequency of that chemo is administered
    • Age of patient
    • Eating habits
    • Other cancer treatments
  • One of the most common reasons for a weak immune system 1
  • Can cause neutropenia, which decreases the number of white blood cells 1
    • When this happens, it might be more difficult for your body to fight infections


  • Impact on your immune system depends on 1:
    • Dose and frequency that radiation is administered
    • Location and amount of body being treated
    • Other cancer treatments
  • May destroy healthy cells which can lead to increased risk of infection 2
  • Radiation for metastatic breast cancer patients is the most likely to cause low counts of white blood cells 1
    • This is especially the case if the cancer has metastasized to the bones 3
      • This effects your immune system in a similar way to how chemo affects your immune system, with the likelihood of developing neutropenia 3
  • Local radiation doesn’t have a huge impact on the immune system 3

Targeted Cancer Drugs

  • Some targeted therapies known to increase risk of infection include 4:
    • trastuzumab emtansine (Kadcyla)
    • everolimus (Afinitor)
    • trastuzumab (Herceptin)
    • trastuzumab with pertuzumab (Perjeta)
    • palbociclib (Ibrance)
    • ribociclib (Kisqali)
    • abemaciclib (Verzenios)
  • Targeted therapies have less negative side effects than chemo 4


  • Impact on your immune system depends on 1 :
    •  Length of hospital stay
    • How long and extensive the procedure was
    • Amount of bleeding during surgery
    • Eating habits
    • Other cancer treatments
    • Other comorbidities
  • Major surgeries can affect immune system and impact its ability to fight infections and they expose your body to germs 2
  • Lymph nodes removal doesn’t affect immune system 4
  • The immune system may take anywhere from 10 days to many months to fully recover 1


  • May impact your immune system and your body’s ability to fight infections 1

Hormone Therapy

  • Doesn’t affect your immune system 4

What You Can Do   

While no one specific thing will boost your immune system to 100% , there are various things you can do to help your immune system and to lower your risk of adverse effects from a COVID-19 diagnosis. A few of these are:

  • Sleep well – try to get around 7 hours of sleep a night
  • Exercise regularly – exercise doesn’t have to be strenuous and light activity is better than nothing
  • Eat healthy foods
  • Engage in stress reduction and management practices
  • Don’t smoke – if you do smoke, try to quit
  • Wash your hands
  • Practice social distancing

Photo by engin akyurt on Unsplash

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  • Jun 4, 2020, 12:00 AM

    Individuals diagnosed with cancer have been identified as being at a high-risk of getting seriously ill if they get COVID-19. Data from various studies show that the type of cancer, the stage, the person’s age, health, and other factors contribute to how high-risk a patient may be. In addition to this, the type of treatment a person is receiving and how long their last treatment was, can all impact their outcome. At the same time, a few studies have shown that breast cancer patients fare better, compared to patients with other types of cancers.

The views and experiences expressed through personal stories on Our Voices Blog are those of the authors and their lived experiences. They do not necessarily reflect the position of the Canadian Breast Cancer Network. The information provided has not been medically reviewed and is not intended to be a substitute for professional medical advice. Always seek the guidance of your healthcare team when considering your treatment plans and goals.