The Fault in Our EGFRs

The Fault in Our EGFRs

The Fault in Our Stars is a novel written by John Green. Since its release in both print and film, the moving story has managed to strangle many hearts around the world as it explores many colorful yet melancholic themes of life, cancer being among them. One example is a clever nod to Shakespeare’s Julius Caesar, specifically the following line by Caddius: “The fault, dear Brutus, is not in our stars, / But in ourselves, that we are underlings” 6. Of all the literary works I’ve read and enjoyed over the years, this line has been especially memorable. Caddius implies fate (or stars for that matter) is a negligible force, for it’s a person’s own fault alone if their life falls short of their expectations. By titling his book “The Fault in Our Stars” it is clear Green disagrees, at least as it pertains to cancer and our dear protagonists in the novel.

Although cancer can certainly be acquired through environmental means such as smoking or radiation, it can also be genetic. In fact, if we want to get a little more technical, for a select group of people their undoing could specifically be a fault in their epidermal growth factor receptor or EGFR (HER1/ErbB1) gene2. EGFR positive lung cancer is most common in people who have never/rarely smoked, have adenocarcinoma, women, young adults and people of asian or east asain heritage2. Additionally, adenocarcinoma is a subtype of non-small cell lung cancer (NSCLC) which causes nearly 80-85% of all lung cancers4. Risk of acquiring adenocarcinoma is increased for patients who smoke, inhale second hand smoke, and are exposed to radon gas, asbestos or other cancer-causing agents in their daily lives4.

Generic Naming Formula: Name = prefix + substem(s) + stem

Image adapted from: RxPharmacist CPJE Study Guide 2020

If we are dealing with an EGFR positive case of lung cancer and wish to decide on a medication, it makes sense we would attempt targeted therapy as opposed to standard chemotherapy in order to directly inhibit the EGFR receptor. Therefore, NSCLC EGFR+ patients can typically be administered EGFR inhibitors (as outlined below). I have included some other potential mutations and their therapies as a bonus below. Note they all end in -nib, as they are all tyrosine kinase inhibitors (TKI), the bolded drugs are preferred. As far as terminology, medications ending in ‘-mab’ denote monoclonal antibodies which are biologic type medications as they are usually therapeutic proteins and large structures chemically. Medications ending in ‘-nib’ are usually small molecules, think of this as a car versus an airplane which are ‘-mabs’ for size.

You should anticipate a rise in biosimilar oncology medications on the market. Overall, the Food and Drug Administration (FDA) has approved 29 biosimilar medications so far, and almost all of them have a role to play in oncology therapeutics. If you want a much deeper dive into oncology and many more disease state topics, check out our CPJE Study Guide. Additionally, here are some useful resources on cancer you can also reference:

Sincerely,

Jean Hanna

References:

  1. “What Causes Cancer?” American Cancer Society, www.cancer.org/cancer/cancer-causes.html.
  2. “EGFR Mutation and Lung Cancer: What Is It and How Is It Treated?” Lung Cancer Foundation of America, 18 Oct. 2019, lcfamerica.org/lung-cancer-info/types-lung-cancer/egfr-mutation/.
  3. “What Is Lung Cancer?: Types of Lung Cancer.” American Cancer Society, www.cancer.org/cancer/lung-cancer/about/what-is.html.
  4. Publishing, Harvard Health. “Adenocarcinoma of the Lung.” Harvard Health, www.health.harvard.edu/a_to_z/adenocarcinoma-of-the-lung.
  5. “Non-Small Cell Lung Cancer Targeted Drug Therapy: Lung Cancer Drugs.” American Cancer Society, www.cancer.org/cancer/lung-cancer/treating-non-small-cell/targeted-therapies.html.
  6. Shakespeare, W., Mowat, B. A., & Werstine, P. (2005). The tragedy of Julius Caesar. New York: Washington Square Press.

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