The Standard for Mathematical Practice (from the Common Core State Standards for Mathematics, CCSS)
- Make sense of problems and persevere in solving them.
- Reason abstractly and quantitatively.
- Construct viable arguments and critique the reasoning of others.
- Model with mathematics.
- Use appropriate tools strategically.
- Attend to precision.
- Look for and make use of structure.
- Look for and express regularity in repeated reasoning.
Also from CCSS
- Reason quantitatively and use units to solve problems.
- Understand solving equations as a process of reasoning and explain the reasoning.
- Create equations that describe numbers or relationships.
- Interpret functions that arise in applications in terms of the context.
- Build a function that models a relationship between two quantities.
- Apply geometric concepts in modeling situations
- Summarize, represent, and interpret data on a single count or measurement variable.
- Understand and evaluate random processes underlying statistical experiments.
- Make inferences and justify conclusions from sample surveys, experiments and observational studies.

Video Links : What is Cancer?
From MacMillan Cancer Support: https://www.youtube.com/watch?v=5MEYFgVnlb4
From TPT PBS Originals: https://www.tptoriginals.org/cancer-101/
From Teenage Cancer Trust: https://www.youtube.com/watch?v=2g5nJfKoIqE
Click on link to access pdf slides: https://www.ceoroundtableoncancer.org/sites/default/files/careers_cancer_speaker_kit.pdf


A Cancer Journey
A hypothetical story of the people who touch the life of a woman with cancer
David Mankoff, MD, PhD, 2021
A woman, who we’ll call Ms. X., visited her doctor because she has found a lump in her breast.
Her General Practitioner performed a Clinical Breast Exam and confirmed the existence of the lump. The GP ordered a mammogram and a 3-D x-ray of her breast. A mammogram is a low-energy x-ray that produces images used for screening and detecting breast cancer. A 3-D x-ray moves in an arc to produce multiple images from multiple angles. The mammography technician set Ms. X up and performed the tests. A radiologist read Ms. X’s images and found a 2.5 centimeter mass in her left breast.
Ms. X’s next step was a procedure called a needle biopsy, performed by a radiologist. This removes a tissue sample from the mass in patient’s breast. Ms. X’s tissue sample was prepared for viewing by a medical radiologist technician or a pathologist technician. The technician must first put the tissue sample into a formula for 6-12 hours before they can begin the processing of the sample. The preparation of the slides that are put under a microscope to be read, involves embedding, sectioning and staining, all performed by the technician. Once the slides are ready, a pathologist reads the slides. The pathologist found cancer cells in Ms. X’s tissue slides and staged or categorized the her cancer according to the size of the mass. Ms. X’s tumor size of 2.5cm was labeled with a pT (primary tumor) of T2. It can often take a week or so for the pathologist to prepare their report, so this was a very tense time for Ms. X.
Ms. X was then referred to a surgeon, specifically a surgical oncologist. After examining Ms. X, and reading the reports from the pathologist and radiologist, her surgeon recommended a lumpectomy. A lumpectomy removes the tumor and a small area around the tumor to make sure those cells are normal, meaning the cancer hasn’t spread. Because the surgeon found suspicious lymph nodes, a sampling of the lymph nodes was part of her surgery regiment. Lymph nodes are all over your body and often when a surgeon removes a primary tumor (Ms. X’s breast tumor), they will also remove one or more of the nearby regional lymph nodes to check for the presence of cancer.(Lymph Nodes and Cancer What Is the Lymph System?, n.d.)
Ms. X has her lumpectomy and lymph node biopsy surgery. The surgeon removed the tumor from her breast and 5 lymph nodes from the area under her left armpit. The tumor and the lymph node samples were sent to pathology. The pathologist found cancer cells in 3 of the 5 lymph nodes that were removed.
Ms. X returned to her surgeon to hear the results of her latest pathology report. The news was bad, but the quick appointment of a care team, helped Ms. X feel supported. In her team was a radiologist who was to perform a PET scan to see if the cancer had spread to other sites. She also was assigned a medical oncologist who would be in charge of her treatment plan. She was schedule to see a genetic counselor to explore her family’s medical history, especially incidences of breast cancer. Ms. X was assigned a patient navigator, who identified an oncological social worker as part of her patient and family services, because Ms. X was concerned about how her illness and treatment would affect her young children.
Ms. X first had her PET/CT scan. A Positron Emission Tomography and Computed Tomography Scan uses radioactive material to track cancer cells in your body. A staff member injected her with radioactive glucose that was quickly absorbed by cancer cells. Ms. X went through the donut like machine while the nuclear medical technologist operated the scan to get the correct images. The radiologist who read the images was pleased to report to her oncologist, that the cancer had not spread to any other parts of her body. The radiology report included the good news that the surgeon had removed most of the cancer!
Her medical oncologist used all of the radiology and pathology reports as well as the results of the blood tests the genetic counselor ordered to create a treatment plan for Ms. X. The first phase of treatment was chemotherapy for 3-6 months. Adjuvant chemotherapy drugs are given to patients after surgery to kill any cancer cells in the body that may have been too small for any scans to see. Ms. X’s specific chemotherapy drugs were prepared by a pharmacologist; a pharmacy technologist actually did the physical labor. The drugs themselves were designed by a biomedical scientist. A nurse or nurse practitioner managed Ms. X’s infusions (how the chemotherapy drugs are delivered). Ms. X also spoke with a nutritionist to make sure she was able to eat healthily even though she often doesn’t feel well after her chemotherapy treatments.
After a few months, Ms. X’s medical oncologist announced that she had finished with her chemotherapy treatment. The oncologist had monitored her scans and declared she was cancer free! Ms. X then had to see a radiation oncologist. This oncologist recommends radiation therapy to sterilize the sites where the cancer was, in order to avoid a recurrence. During radiation therapy high-energy particles or waves are delivered to specific areas of the body. The planning session to pinpoint the exact sites for Ms. X’s radiation therapy was called a simulation, or a sim. At this point a radiation oncology medical physicist and a dosimetrist, made calculations and measurements to determine the radiation dosage and delivery are correct. During radiation treatments, a radiation oncology nurse, nurse practitioner or physician assistant were present to answer questions and help Ms. X manage her health. A radiation therapist actually operated the equipment and administered her treatments.
Ms. X’s cancer journey has been an ordeal for her and her family. Her story has a happy ending; she is living a cancer free life and trying to appreciating every minute of it!
Careers in Cancer Introduction
Reflection Questions
Answer the questions with as much detail as you can provide.
- Had you previously considered a career in cancer?
- Has cancer affected your life or the lives of family members or others you are close to? (If this question is to personal or emotional, please don’t feel the need to expound.)
- Which career(s) in cancer most align with your interests, personality and plans for the future?
- How do you think success in math is aligned with a career in the cancer field?
- What have you learned about yourself and your future from working on this lesson.
A nurse is caring for a young cancer patient with leukemia, who is running a fever. The cancer cells keep the bone marrow from making enough normal blood cells so the patient is often susceptible to infections. (The Immune System and Cancer | Cancer Research UK, n.d.)
Task
The doctor orders Amoxicillin 25mg PO TID for the child who weighs 26 pounds. The supply you have from the pharmacy is 50 mg/5ML oral suspension. The safe dosage range for the drug is 15mg/kg/day in divided doses.
Calculate the maximum dosage a child of this weight can receive each day, and how much that would be for each dose if given 3 doses.
Also calculate how many mL of Amoxicillin this child will receive each dose and explain if that dosage is safe for this child.
Some specific details you need to know:
PO TID means by mouth three times a day
1 kg = 2.2 pounds.
The minimum post high school education required to be a nurse is an associate’s degree in nursing (ADN). Most employers look for nurses to have earned a bachelor’s degree in nursing BSN. All U.S. nurses must take and pass a national exam. Many states also require a license. To receive an Advance Practice Registered Nursing Degree (APRN), post graduate work is required.
The median salary for a RN is $73,300. Of course, this varies based on your work and geographical locations.
Short video: 10 signs that you were born to become a nurse (10 Signs That You Were Born to Become a Nurse || EveryNurse.Org, n.d.)
Answer:
Safe Dosage:
First find the patient’s weight in kilograms =>
(15mg/kg)(11.8 kg) = 177 mg/day is safe
(25mg)(3) = 75 mg, so dosage is safe
Dose: => x = 2.5 mL per dose.
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| Career: Biomanufacturing Technician |
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A biomanufacturing technician works in a lab with cells. In our task, the technician has to calculate many steps in the cell making process.
Our body makes & uses T cells to fight bacteria & viruses; they are part of our immune system. New cancer research is using synthetic (made in a lab) T-cells to target specific cancer cells to destroy them. The cells they make are called chimeric antigen receptor T cells or CAR T cells.
This treatment is called Immunotherapy.
Task
The cell concentration is 1.5 x 106 cells/mL. This means in a mL container, there are 1.5 million cells. A mL of water weights 1 gram. One milliliter is about 20 drops of water and a teaspoon contains 5 mL. Does this give you an idea of the size of a cell?
The culture bag where the cells grow, contains media and cells. This culture bag weighs 212g. 212 grams is the weight of a 80 pennies, 4 pop tarts or an adult hamster.
Flow cytometry is a technique used to detect the characteristics of cells. When the manufactured cells go through the flow cytometry process, 22.7% of them are the actual desired CAR T cells.
How many CAR T cells are there in a culture bag?(Fesnak, 2021)
To be a biomanufacturing technician, you need an associate’s degree. In 2020, the national average salary was $46,340/year. short video(What Is Biomanufacturing? | Biotech Careers, n.d.)
More details about becoming a biotech careers(Biotech Careers | The Best Source of Information about Biotech Careers and Companies, n.d.)
A doctor who specializes in the immune system is called an immunologist. After medical school and residency (7 years), a doctor must complete an immunology fellowship. Licensing is required and board certification is highly recommended. The average salary of an immunologist is $200,900. short video(How To Become An Immunologist – Career Igniter, n.d.)
More details about becoming an immunologist(How to Become an Immunologist, n.d.)
A doctor who specializes in cancer is called an oncologist. After medical school and residency (7 years), a doctor must complete an oncology fellowship in various sub-specialty such as pediatric oncology, gynecological oncology, etc. Licensing is required and board certification is highly recommended. short video(How to Become an Oncologist, n.d.-a) More details on how to become an oncologist(How to Become an Oncologist, n.d.-b)
The answer:
1.5 x 106 cells in 1 mL = 1.5 x 106 cells in 1 gram.
The culture bag contains 212 grams, so
(1.5 x 106 cell/g)(212g) = 318 x 106 = 3.18 x 108 cells in a culture bag.
22.7% of these cells are CAR T cells, so
(3.18 x 108 cells)(22.7%) = .72186 x 108 = 7.2186 x 107 = 72,186,000 CAR T cells
Or without scientific notation
(1,500,000cells/g)(212g) = 318,000,000 cells
22.7% of 318,000,000 cells= 72,186,000 CAR T cells
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| Career: Pharmacist & Pharmacy Technicians
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Task 1
Often times, patients who receive chemotherapy have their medicine infused or delivered intravenously (IV). The drugs are prepared in a chemo transport bag on an individual basis after the patient has arrived and their height, weight and sometimes a blood sample have been collected and analyzed. A pharmacy technician gathers all of the supplies needed to prepare each dose. Another pharmacy technician mixes the items in a sterile environment. The pharmacist checks the technician’s work before the drugs are administered by an oncology nurse.
The amount of drug or dose a patient receives is based upon their height and weight. A formula is used to find their Body Surface Area (BSA). This number is then used with the protocol dose to find the patient’s exact dose. While there are many formulas to find a patient’s BSA, the Mosteller formula is the most straight forward mathematically. Your task will be that of the pharmacist, finding the patient’s correct dose of each of their chemotherapy drugs.
Your patient weighs 70kg and is 155cm tall and has breast cancer. Her oncologist orders 500mg/m2 of fluorouracil with 100mg/m2 of epirubicin and 500mg/m2 of cyclophosphamide. Calculate the dose of each drug in mg, for the patient. Use the Mosteller formula to calculate her BSA and round to the nearest hundredth.(Dosage Calculations Based on Body Surface Area – YouTube, n.d.)
Mosteller formula: BSA
A pharmacist technician needs to be certified by taking the Pharmacy Technician Certification Exam (PTCE). You can attend a training program or get an associate’s degree to help you prepare for the exam. A pharmacy technician can make an average of $35,100 annually. short video(Pharmacy Technician – Explore Health Care Careers – Mayo Clinic College of Medicine & Science, n.d.)
A pharmacist usually attends between 6-8 years in post-secondary education to receive a Doctor of Pharmacy degree. Some of the 4-year programs accept students with an associate’s degree, but many require a bachelor’s degree. There are also some 6-year programs you can enter after high school. Details on how to become a pharmacist(Pharmacists : Occupational Outlook Handbook: : U.S. Bureau of Labor Statistics, n.d.)
A nurse who specializes in cancer care is called an oncology nurse. After earning a bachelor’s degree in Nursing (BSN), a nurse will need to learn specific cancer care skills through coursework, clinical practice or continuing education. After that, an exam is necessary to earn a certification as an OCN. The median annual salary for a certified oncology nurse is $77,460. In order to become an oncology nurse practitioner, a nurse must have a master’s degree and become an advanced practice registered nurse, APRN. More information on becoming a certified oncology nurse or nurse practitioner(Oncology Nurse Careers and Education | All Nursing Schools, n.d.)
A doctor who specializes in cancer is called an oncologist. After medical school and residency (7 years), a doctor must complete an oncology fellowship in various sub-specialty such as pediatric oncology, gynecological oncology, etc. Licensing is required and board certification is highly recommended. The average salary for an oncologist is $263,000 annually. short video (How to Become an Oncologist, n.d.-a) More details on how to become an oncologist(How to Become an Oncologist, n.d.-b)
Answer
BSA =
Fluorouracil: (500 mg/m2 )(1.74 m2) = 870 mg
Epirubicin: (100 mg/m2)(1.74 m2) = 174 mg
Cyclophosphamide: (500 mg/m2 )(1.74 m2) = 870 mg
Task 2
Often times, patients who receive chemotherapy have their medicine infused or delivered intravenously (IV). The drugs are prepared and delivered in a chemo transport bag on an individual basis after the patient has arrived and their height, weight and sometimes a blood sample have been collected and analyzed. A pharmacy technician gathers all of the supplies needed to prepare each dose. Another pharmacy technician mixes the items in a sterile environment. The pharmacist checks the technician’s work before the drugs are administered by an oncology nurse.
The amount of drug or dose a patient receives is based upon their height and weight. A formula is used to find their Body Surface Area (BSA). This number is then used with the doctor’s prescribed dose to find the patient’s exact dose. While there are many formulas to find a patient’s BSA, the Mosteller formula is the most straight forward mathematically. Your task will be that of the pharmacist, finding the patient’s correct dose of each of their chemotherapy drugs.
The drug carboplatin for ovarian carcinoma is administered intravenously at a dose of 360mg/m2, except in patients with impaired kidney function. If this is the case, the dose is reduced by 30%. (When a patient’s kidneys are diseased or impaired, the effect of any drug can be altered by patient susceptibility, pharmacodynamic changes or pharmacokinetic changes.) Your patient is 5ft. 2in. and weighs 110lbs. She is renally (kidney) impaired. Calculate the dose of carboplatin for the patient. Use the Mosteller formula to calculate her BSA and round to the nearest hundredth. (Dosage Calculations Based on Body Surface Area – YouTube, n.d.)
Mosteller formula: BSA
A pharmacist technician needs to be certified by taking the Pharmacy Technician Certification Exam (PTCE). You can attend a training program or get an associate’s degree to help you prepare for the exam. A pharmacy technician can make an average of $35,100 annually. short video(Pharmacy Technician – Explore Health Care Careers – Mayo Clinic College of Medicine & Science, n.d.)
A pharmacist usually attends between 6-8 years in post-secondary education to receive a Doctor of Pharmacy degree. Some of the 4-year graduate programs accept students with an associate’s degree, but most require a bachelor’s degree. There are also some 6-year Pharm.D. programs you can enter after high school. A pharmacist earns on average $129,000 annually. Details on how to become a pharmacist(Pharmacists : Occupational Outlook Handbook: : U.S. Bureau of Labor Statistics, n.d.)
A nurse who specializes in cancer care is called an oncology nurse. After earning a bachelor’s degree in Nursing (BSN), a nurse will need to learn specific cancer care skills through coursework, clinical practice or continuing education. After that, an exam is necessary to earn a certification as an OCN. The median annual salary for a certified oncology nurse is $77,460. In order to become an oncology nurse practitioner, a nurse must have a master’s degree and become an advanced practice registered nurse, APRN. More information on becoming a certified oncology nurse or nurse practitioner(Oncology Nurse Careers and Education | All Nursing Schools, n.d.)
A doctor who specializes in cancer is called an oncologist. After medical school and residency (7 years), a doctor must complete an oncology fellowship in various sub-specialty such as pediatric oncology, gynecological oncology, etc. Licensing is required and board certification is highly recommended. short video(How to Become an Oncologist, n.d.-a) More details on how to become an oncologist(How to Become an Oncologist, n.d.-b)
A doctor who specializes in kidney problems is called a nephrologist. After medical school and residency (7 years), a doctor must complete a nephrology fellowship for another 2-3 years and then pass a certification exam. In 2019, a newly certified nephrologist earned $200,000 annually. More details on becoming a nephrologist(Starting a Career in Nephrology | FMCNA, n.d.)
Answer
5ft. 2in. = 5(12) + 2 = 62 inches
BSA =
If patient’s dose is reduced by 30%, patient will receive 100% – 30% = 70% of the drug. You can take this reduction with the recommended dose or with the calculated exact dose.
(360 mg/m2)(70%) = 252 mg/m2
(252 mg/m2)(1.48 m2) = 372.96 mg of carboplatin
OR
(360 mg/m2)(1.48 m2) = 532.8 mg
(532.8 mg)(70%) = 372.96 mg of carboplatin
Task 3
Often times, patients who receive chemotherapy have their medicine infused or delivered intravenously (IV). The drugs are prepared in a chemo transport bag on an individual basis after the patient has arrived and their height, weight and sometimes a blood sample have been collected and analyzed. A pharmacy technician gathers all of the supplies needed to prepare each dose. Another pharmacy technician mixes the items in a sterile environment. The pharmacist checks the technician’s work before the drugs are administered by an oncology nurse.
The amount of drug or dose a patient receives is based upon their height and weight. A formula is used to find their Body Surface Area (BSA). This number is then used with the doctor’s prescribed dose to find the patient’s exact dose. The most widely used formula to calculate BSA is the Dubois & Dubois formula which was presented in 1916. Many healthcare professionals are instead using the Mosteller formula, presented in 1987. Miscalculations in finding a patient’s BSA can have many negative consequences. Studies show that up to 30% of patients have received inadequate treatment because of these errors. Insert citation Your task will be to calculate the patient’s dose using each formula to find BSA and then compare the actual amounts of the drug the patient has received.
Your patient weighs 85kg and is 190cm tall and has non-Hodgkins lymphoma. His medication is dosed at 420 mg/m2 over 4 hours. How much of the drug in milligrams is the patient getting in his infusion? How much is he getting every hour? Use both the Mosteller formula and the DuBois & DuBois formula to find his BSA (so you will do the dose calculations twice.) Find the difference in milligrams between the total doses from each BSA calculation.
Mosteller formula: BSA
Dubois formula: BSA =
A pharmacist technician needs to be certified by taking the Pharmacy Technician Certification Exam (PTCE). You can attend a training program or get an associate’s degree to help you prepare for the exam. A pharmacy technician can make an average of $35,100 annually. short video(Pharmacy Technician – Explore Health Care Careers – Mayo Clinic College of Medicine & Science, n.d.)
A pharmacist usually attends between 6-8 years in post-secondary education to receive a Doctor of Pharmacy degree. Some of the 4-year programs accept students with an associate’s degree, but many require a bachelor’s degree. There are also some 6-year programs you can enter after high school. A pharmacist earns on average $129,000 annually. Details on how to become a pharmacist(Pharmacists : Occupational Outlook Handbook: : U.S. Bureau of Labor Statistics, n.d.)
A nurse who specializes in cancer care is called an oncology nurse. After earning a bachelor’s degree in Nursing (BSN), a nurse will need to learn specific cancer care skills through coursework, clinical practice or continuing education. After that, an exam is necessary to earn a certification as an OCN. The median annual salary for a certified oncology nurse is $77,460. In order to become an oncology nurse practitioner, a nurse must have a master’s degree and become an advanced practice registered nurse, APRN. More information on becoming a certified oncology nurse or nurse practitioner(Oncology Nurse Careers and Education | All Nursing Schools, n.d.)
A doctor who specializes in cancer is called an oncologist. After medical school and residency (7 years), a doctor must complete an oncology fellowship in various sub-specialty such as pediatric oncology, gynecological oncology, etc. Licensing is required and board certification is highly recommended. The average salary for an oncologist is $263,000 annually. short video(How to Become an Oncologist, n.d.-a) More details on how to become an oncologist(How to Become an Oncologist, n.d.-b)
Answer
BSA Mosteller =
BSA Dubois =
=
= =
Total Dose Mosteller: (420 mg/m2)(2.12 m2) = 890.4 mg
Hourly Dose Mosteller: 890.4 mg/4 hours = 222.6 mg/hr
Total Dose Dubois: (420 mg/m2)(1.67 m2) = 701.4 mg
Hourly Dose Dubois: 701.4 mg/4 hours = 175.35 mg/hr
Difference in totals: 890.4mg – 701.4mg = 189 mg
As we have learned from COVID 19, testing or screening is an important part of our healthcare system. Likewise, screening plays a vital part in cancer care. Screenings for many cancers are done on a regular basis, when a person does NOT have symptoms of the disease. The purpose is to find disease, in this case, cancer, in its early stage. Screenings for cancer can be varied, mostly in how and when. The debate over when cancer screenings are offered is often a theme in health disparities; that is not part of our task today.
Screening for cancer can be done with imaging, like mammography or an MRI, clinical, like a breast exam or skin check, or pathology/biospecimen, like a biopsy or blood test. While some tests have definite quantitative definitions, others are more open to interpretation. Think of when you take a test based on a grade of 100. 30-40% of your possible results could be passing, while 60-70% could be considered failing. That leaves a lot of gray area. When interpreting test results, physicians who have to provide care for the patient, tend to err on the side of a positive diagnosis because the longer cancer is present, the more damage it does to one’s body and the less likely to respond favorably to treatment, in other words, better safe than sorry. Data scientists, on the other hand, might want more definitive proof of the presence of disease and might err on the side of assuming no cancer is present in their analyses, but will look for further proof.
Task 1
Complete the value of the cells in the two-way table and interpret their meaning. Use the abbreviations T for Test, C for Cancer and + & – for positive and negative.
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Cancer Positive |
Cancer Negative |
| Test Positive |
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| Test Negative |
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Interpretation:
Upper left: Upper right:
Lower left: Lower right:
Which cells represent the truth?
Physicians, healthcare data scientists, and epidemiologists measure the validity of medical tests and screenings using probability and percentages. In order to find the percentages/probabilities, we’ll need to find and use totals from the table.
Task 2
The two-way table below has been populated with data from screening mammogram classification among women ages 50 to 59 at the time of screening. Breast Cancer Surveillance Consortium Data Explorer, 1994-2009 (BCSC Data Explorer [Internet]. Seattle: Breast Cancer Surveillance Consortium. 2011- [cited 2019 Oct 20]. Available from: http://tools.bcsc-scc.org/dataexplorer/.).
Calculate the cells that represent Totals.
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Cancer Positive |
Cancer Negative |
Total |
| Test Positive |
7,044 |
165,115 |
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| Test Negative |
1,534 |
1,623,399 |
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| Total |
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Next, we’ll define the probabilities and percentages. Sensitivity, Se, (), measures the probability that a person who has cancer gets a test result of positive. Specificity, Sp, ( ), measures the probability that a person who does not have cancer gets a test result of negative. Positive predictive value, PPV, (), measures the percentage of people with a positive result who actually have cancer while negative predictive value, NPV, (), measures the percentage of people with a negative result who actually do not have cancer. (Performance Measures – Assessment of Cancer Screening: A Primer – NCBI Bookshelf, n.d.)
Find the probabilities and percentages for the table of values above. Discuss your results and their ramifications.
Sensitivity:
Specificity:
PPV:
NPV:
An epidemiologist is often called a disease detective. They use statistical analysis to study characteristics of a disease including how a contagious disease is spread. They also use statistics to analyze screenings and disease testing methods. (Who Are Epidemiologists? | Teacher Roadmap | Career Paths to Public Health | CDC, n.d.) To be an epidemiologist you need a master’s degree in public health, with a concentration in epidemiology. The average annual salary is $74,560.(Epidemiologists : Occupational Outlook Handbook: : U.S. Bureau of Labor Statistics, n.d.) More details and a short video
A healthcare data scientist uses data to improve the healthcare system through analysis and mathematical modeling. This could mean helping hospitals operate more efficiently, influencing diagnostic and treatment processes, or developing artificial intelligence to diagnose and predict disease. To become a healthcare data scientist, you earn and bachelor’s degree in a mathematical or computer science based major, and then pursue a master’s degree in health data science. The average entry level salary of a healthcare data scientist is $93,202. (What Does a Data Scientist in Healthcare Do?, n.d.) More information about healthcare data science
Answers
| |
Cancer Positive |
Cancer Negative |
| Test Positive |
C+/T+ |
C+/T- |
| Test Negative |
C-/T+ |
C-/T- |
Interpretation:
Upper left: Has Cancer/Tested Positive Upper right: No Cancer/Tested Positive
Lower left: Has Cancer/Tested Negative Lower right: No Cancer/Tested Negative
Which cells represent the truth:
UL: C+/T+ and LR: C-/T-
| |
Cancer Positive |
Cancer Negative |
Total |
| Test Positive |
7,044 |
165,115 |
172,159 |
| Test Negative |
1,534 |
1,623,399 |
1,624,933 |
| Total |
8,578 |
1,788,514 |
1,797,092 |
Sensitivity: 7,044/8,578 = 82%
Specificity: 1,623,399/1,788,514 = 91%
PPV: 7,044/172,159 = 4%
NPV: 1,623,399/1,624.933 = 99.9%
Sensitivity and specificity characterize the accuracy of the test. Our testing process would be ideal if our sensitivity was higher than 82%. This means 18% of the people tested who have cancer, received a negative test result, called false negative. With frequent enough screenings, or if symptoms exist, more testing will take place and cancer will be detected if it is there.
The specificity rate of 91% means that, out of the tested patients who don’t have cancer, 9% were told (falsely) that they have cancer, called false positive. Further testing is always done, often times a clinical exam or biopsy to rule out cancer.
The positive and negative predictive values (PPV and NPV) provide guidance on how to treat a positive and negative test respectively. PPV & NPV are different than sensitivity, specificity, false positives and false negatives, because those values are measured out of patients with or without cancer. Positive and negative predictive probabilities use patients’ test results as the base value for finding the percent.
A PPV of 4% means that of those women who tested positive, only 4% of them actually have cancer. So, after receiving the results of a positive mammogram screening, often enough, there is no cause for alarm. Note, that this data represents screenings of women with no symptoms, and that will keep the PPV low. The prevalence of cancer in this data is 8578/1797092, which is about 0.5%.
An NPV of 99.9% means when a woman gets a negative test result, she can be 99.9% sure she does not have cancer.
Careers in Cancer
Catherine Michini
Philadelphia High School for Girls