A team of phys clans treated four patients with breast cancer. Each patient received a course of chemotherapy (the same combination of drugs for each patient). In addition, researchers sequenced the genotype of cells in healthy skin tissue and in each patient's tumor at intervals during the treatment period. At the end of the course of treatment, all four patients were declared free of detectable cancer. But within 18 months, three of the patients had suffered a relapse. The researchers sequenced samples from the new tumors. If you compared the genetic information from the four patients, what kind of difference might you expect to find between the cured patient and the ones who suffered relapses? How might the theory of evolution by natural selection explain the difference?
Want to see the full answer?
Check out a sample textbook solutionChapter 16 Solutions
Biology
- Breast Cancer Screening Program – A group of women were subjected to a breast cancer screening program. A newly developed screening test was utilized to measure its sensitivity and specificity against a gold standard test. a) What is the prevalence of breast cancer in this population? b) Calculate the Sensitivity of the test and provide interpretation c) Calculate the Specificity of the test and provide interpretationarrow_forward1) A) List 15 drugs (monoclonal antibodies can be used) used clinically to treat cancer in humans. These targets must be signal transduction pathway components. B) For each drug, list the specific protein targeted. C) For each drug, describe the efficacy of treatment (i.e. what is the success rate in life extension) as well as appropriate cost of treatment whether it be per round or an average annual cost.arrow_forwardWhat is unique about the use of viral gene therapy in cancer immunotherapy that allows it to be safe where it wouldn’t safe against something like sickle cell anemia? Please answer in short and ASAP .arrow_forward
- A patient comes into your clinic exhibiting generic cancer symptoms. In order to help form a diagnosis, you ask about patient history and they tell you that they worked for years in an agricultural job, primarily in handling food for large bovine animals and then later working with insect pesticide treatment of grain fields. You decide to test for elevated levels of the environmental agent(s) in their body and focus your cancer diagnosis on based on the established associations of epigentic effects and cancer. O nickel and cadmium; stomach and skin cancer O benzene; breast, prostate and thyroid cancer O polycyclic aromatic hydrocarbons and benzene; lung, breast, stomach and skin cancer O arsenic and endocrine disruptors; skin, bladder, liver and kidney cancerarrow_forwardHello! My question is: Discuss the evidence used to establish the causal association between virus infection and cancer. How can this knowledge be used in the diagnosis, treatment and prevention of virus-associated tumours? Thank you!!!!arrow_forwardWhat are the molecular mechanism of cancer development. What mechanisms get mutated into oncovirus?arrow_forward
- A 42-year-old woman comes to the physician for a follow-up examination after two separate Pap smears have shown dysplastic epithelial cells. Results of a molecular diagnostic test show DNA that encodes high-risk versions of the human papillomavirus E6 and E7 proteins. The viral E6 protein binds to the cellular p53 tumor suppressor gene, causing it to be degraded. Which of the following best describes the mechanism by which the E6 protein causes cervical cancer? (A) Arrests the cell cycle (B) Enhances tissue invasion and metastasis (C) Inhibits telomerase expression (D) Prevents apoptosis (E) Sustains angiogenesisarrow_forwardIf the cancer vaccine can elicit an inmmune response against the targets found on tumor cells, is there a way to use a vector to distinguish the same targets found on normal healthy cells?arrow_forward/20. In class, we discussed diffferent types of genetic change that can cause a normal gene (proto- oncogene) to become a cancer-causing gene (oncogene), Which of the following would not be a cause? A) translocation or transposition (movement of DNA within the same genome) B) gene ampliffication (increased number of copies of a given gene) C) epigenetic change D) point mutation that changes the gene's product E) loss of telomeres during DNA replication ancer?arrow_forward
- Human tumour viruses account for an estimated 12% to 20% of cancers worldwide and often establish persistent infections in the host. Explain how viruses contribute to cancer development.arrow_forwardRetroviruses can cause cancer, along with some viruses with DNA genomes. For example, herpes papillomavirus causes cervical cancer. The HPV genome encodes a protein called E6 that interferes with p53 function, and another protein called E7 that inhibits the function of Rb protein. Explain how HPV causes cancer. Are the viral E6 and E7 protein functions more similar to oncogenes or tumor suppressors?arrow_forwardHow does one perform a Southern blot and how does one performs a western blot. What can a Southern blot can detect, and what can a western blot can detect. Connect a specific biological mechanism for how viruses can cause cancer to each of the two pieces of data that you have.arrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning