Med Onco Flashcards
What is the effect of hormone replacement therapy on risk for
endometrial CA
colorectal CA
fractures
breast CA
Hormone replacement therapy (HRT) with conjugated equine estrogens plus progestins increases the risk of breast cancer. Epidemiologic studies have demonstrated a rapid decrease in elevated breast cancer incidence coincident with the discontinuation of HRT. it takes 6-7 years to double breast cancer risk.
HRT increases the risk of endometrial cancer, however, administration of conjugated estrogens with progesterone abrogates the increased risk of endometrial cancer compared to estrogen alone HRT
HRT decreases the risk of bone fractures and colorectal cancer.
Which subset of patient is MRI recommended for screening for breast cancer
● Women with dense breasts
● First cancer was not detected by mammography
● Axillary breast cancer presentation but no definable breast mass on PE or mammography
● History of radiation therapy to the chest between ages 10 and 30 years
● High genetic risk, such as BRCA1 or BRCA2 carriers or those with Li-Fraumeni, Cowden’s, or Bannayan-RileyRuvalcaba syndromes
35/F with a solitary breast mass left underwent MRM. Her histopathology report revealed invasive ductal carcinoma. Her breast panel IHCs findings revealed ER (+) PR (-) Her 2 (2+). What would be the BEST recommendation to this patient?
A. Request for repeat IHCs
B. Request for HER-2 FISH testing
C. Proceed with treatment with Hormonal therapy only
D. Proceed with treatment with Hormonal and Anti-Her2 Therapy
Answer: B. Request for HER-2 FISH testing
The two most important predictive factors in breast cancer are ER and HER2 expression, and they should be performed on all primary or metastatic cancer biopsy specimens. HER2 status is determined using either IHC staining for protein overexpression or fluorescent in situ hybridization (FISH) for gene amplification. IHC staining of 3+ (on a scale of 0–3+) is considered positive, whereas 0–1+ is considered negative. For cases with 2+ staining, reflex FISH analysis is recommended. FISH can either be used as the initial evaluation or for additional evaluation in IHC 2+ cases. HER2 is considered amplified if the ratio of HER2 to centromere signal on chromosome 17 is ≥2.0. FISH is unnecessary if IHC is 3+ or 0–1+, nor is there a reason for IHC testing if FISH is ≥2.0
How do you differentiate the luminal staging of Breast CA?
Example of TKI for breast CA that targets HER2
Lapatinib, neratinib, tucatinib
Example of TKI for breat CA that targets mTOR
Everolimus
Example of immunotherapy for breast CA that targets CDK4/6
Palbciclib, ribociclib, abemociclib
Example of immunotherapy for breast CA that targets PIK3CA
Alpelisib
Example of immunotherapy for breast CA that targets PDL-1/PD-1
Atezolizumab
Example of immunotherapy for breast CA that targets TROP 2
Sacizutumab govitecan
Example of SERMs
Tamoxifen, Raloxifene, Toremifene
Example of Aromatase inhibitors
Anastrozole, Letrozole, Exemestane
Example of LHRH agonists
goserelin, leuprolide
BRCA 1 gene mutation commonly fall to which molecular subtype of breast cancer
Basal
Indications for Post Mastectomy Radiation due to high risk of locoregional recurrence
● Tumors ≥5 cm
● Four or more positive axillary lymph nodes
● Postoperative positive margins
How is breast CA prognosis affected by pregnancy?
Breast cancer prognosis during pregnancy is similar, stage for stage, as that for age-matched women who are not pregnant.
How does fats affect the risk of prostate CA?
High consumption of dietary fats, such as α-linoleic acid or polycyclic aromatic hydrocarbons that form when red meats are cooked, is believed to increase the risk of prostate cancer
Medications that prevent prostate CA
Currently, no approved preventive agent for prostate cancer
Which is TRUE about PSA testing in prostate cancer screening, diagnosis, and treatment?
A. PSA test is prostate cancer-specific
B. Digital rectal exam (DRE) may increase PSA levels
C. PSA is a useful test for screening 50 years old men for prostate cancer
D. PSA level is strongly associated with the risk and outcome of prostate cancer
D. PSA level is strongly associated with the risk and outcome of prostate cancer
The level of PSA in the blood is strongly associated with the risk and outcome of prostate cancer. A single PSA measured at age 60 is associated (area under the curve [AUC] of 0.90) with a lifetime risk of death from prostate cancer. Most (90%) prostate cancer deaths occur among men with PSA levels in the top quartile (>2 ng/mL), although only a minority of men with PSA >2 ng/ mL will develop lethal prostate cancer.
Option A is incorrect. PSA is produced by both nonmalignant and malignant epithelial cells and, as such, is prostate-specific, not prostate cancer–specific.
Option B is incorrect. Serum levels of PSA may increase from prostatitis, BPH, or prostate cancer. Serum levels are not significantly affected by the DRE.
Option C is incorrect. Recommendations for screening with PSA are based on shared decision-making for men between the ages of 55 and 69. PSA-based screening is a target age group for whom benefits may outweigh the harm. Outside this age range, PSA-based screening as routine is not recommended.
Which diagnostic test is recommended for staging and treatment planning for prostate cancer?
MRI
This androgen deprivation therapy (ADT) used in managing metastatic non-castrate prostate cancer may initially cause a clinical flare of disease and is relatively contraindicated when given alone for patients with spinal cord compromise.
Leuprolide
GnRH agonists/antagonists, such as leuprolide acetate and goserelin acetate, initially produce a rise in LH and FSH followed by a downregulation of receptors in the pituitary gland, which effects a chemical castration. The initial rise in testosterone may result in a clinical flare of the disease, and as such, these agents are relatively contraindicated in men with significant obstructive symptoms, cancerrelated pain, or spinal cord compromise, events that do not occur with GnRH antagonists such as degarelix (Option D).
Most common anatomic site of the prostate where prostate cancer develops?
Peripheral
Most common malignancy that can cause Superior Vena Cava (SVC) syndrome among adult cancer patients?
Small Cell lung CA
Lung cancer, particularly of small-cell and squamous cell histology, accounts for ~85% of all cases of malignant origina
primary treatment for SVCS caused by non-small-cell lung cancer and other metastatic solid tumors
RT
Most common type of malignancy causing metastatic spinal cord compression
Lung CA
Most common site of spine involvement in metastatic spinal cord compression?
Thoracic
The thoracic spine is the most common site (70%), followed by the lumbosacral spine (20%) and the cervical spine (10%). Involvement of multiple sites is most frequent in patients with breast and prostate carcinoma
Next step when patient with CA presents with back pain and + Lhermitte sign
MRI of the spine
What is the initial management for suspicious or confirmed metastatic spinal cord compression?
High-dose steroids
The treatment of patients with spinal cord compression (SCC) is aimed at relief of pain and restoration/preservation of neurologic function. Radiation therapy plus glucocorticoids is generally the initial treatment of choice for most patients with SCC.
Electrolyte abnormalities associated with Tumor Lysis syndrome
Tumor lysis syndrome (TLS) is characterized by hyperuricemia, hyperkalemia, hyperphosphatemia, and hypocalcemia and is caused by the destruction of a large number of rapidly proliferating neoplastic cells.
Tumors associated with TLS
TLS is most often associated with the treatment of Burkitt’s lymphoma, acute lymphoblastic leukemia, and other rapidly proliferating lymphomas, but it also may be seen with chronic leukemias and, rarely, with solid tumors
Preventive approaches for tumor lysis syndrome among high-risk cancer patients include the following; EXCEPT:
A. Aggressive hydration
B. Allopurinol
C. Febuxostat
D. Sodium bicarbonate
Urinary alkalinization with sodium bicarbonate is no longer recommended. It increases uric acid solubility, but a high pH decreases the solubility of xanthine, hypoxanthine, and calcium phosphate, potentially increasing the
likelihood of intratubular crystallization.
How do you prevent TLS?
Hydration 3000 mL/ m2 with PNSS or 0.45 NSS
Allopurinol 300 mg/ m2
Indications for HD if with TLS
What treatment modality has been shown to be successful in managing chemotherapy-induced Hemolytic - Uremic Syndrome (HUS)?
Rituximab
This condition may rarely occur after treatment with antineoplastic drugs. Mitomycin and gemcitabine are the most common offenders. Other antineoplastic drugs are gemcitabine, cisplatin, bleomycin, and proteasome inhibitors, and with VEGF inhibitors
What is the primary therapy or prevention for polyposis coli?
Total colectomy
This chemotherapeutic agent remains the backbone of systemic therapies in colorectal cancer
5-FU
Most common site of distant metastasis in colorectal cancer
Liver
Clinical criteria for the diagnosis of Lynch syndrome or also known as hereditary nonpolyposis colon cancer
Bethesda criteria for clinical diagnosis of Lynch Syndrome ( Remember 3-2-1)
3 - three or more relatives with histologically documented colorectal cancer, one of whom is a first-degree relative of the other two
2 - at least two generations with colorectal cancer involvement
1 - one or more cases of colorectal cancer diagnosed before age 50 in the family
What symptoms are more common in right sided compared to left sided colon CA?
This is the most common side effect of Irinotecan when used in colorectal cancer
diarrhea
Diarrhea is the major side effect of irinotecan. Irinotecan-induced diarrhea is enhanced by the intestinal bacterial production of beta-glucuronidases, causing the transformation of SN38-G to SN38 causing diarrhea.
Chemotherapeutic agents affect bone marrow function. In general, which bone marrow cell type is MOST susceptible to the effects of cytotoxic drugs?
PMNs
Which drug used in the prevention of chemo-induced nausea and vomiting (CINV) acts primarily by promoting gastric motility by inhibiting peripheral dopamine receptors and is used in high doses for highly emetogenic chemotherapy?
Metoclopramide
ideal time to administer primary G-CSF prophylaxis
The best time to give primary G-CSF administration is 24-72 hours after chemotherapy
Continue until ANC > 10,000 /uL
What are the preventive uses of G-CSF?
Dose of G-CSF
pathognomonic finding of anthracycline-induced cardiotoxicity
The pathognomonic finding of anthracycline-induced cardiotoxicity is myofibrillar dropout on
endomyocardial biopsy
Myocardial toxicity of anthracyclines is dose-dependent. Approximately 5% of patients receiving >450–550 mg/m2 total dose of doxorubicin will develop CHF, but it can also develop at substantially lower doses in some patients.
Chemotherapy or hormonal agents associated with CHF
Chemotherapy or hormonal agents associated with Pulmonary fibrosis
Chemotherapy or hormonal agents associated with pneumonitis
Chemotherapy or hormonal agents associated with secondary malignancies or myelodysplasia
Chemotherapy or hormonal agents associated with immune dysfunction and recurrent infections
Chemotherapy or hormonal agents associated with infertility
Chemotherapy or hormonal agents associated with hemorrhagic cystitis
Chemotherapy or hormonal agents associated with renal tubular dysfunction
Chemotherapy or hormonal agents associated with neuropathy
Chemotherapy or hormonal agents associated with ataxia
Chemotherapy or hormonal agents associated with vasomotor symptoms
Chemotherapy or hormonal agents associated with sexual dysfunction
most significant risk factor for cancer overall
age
ECOG status of a 70 year old female with metastatic breast cancer to the spine, capable of only limited self-case and confined to her bed more than 50% of waking hours
3
How do you differentiate complete vs partial response to tx based on RECIST criteria
Definition of progressive dse based on RECIST criteria
Conditions associated with elevated HCG
Conditions associated with elevated calcitonin
Conditions associated with elevated catecholamines
Conditions associated with elevated AFP
Conditions associated with elevated prostatic acid phosphatase
Conditions associated with elevated neuron specific enolase
Conditions associated with elevated LDH
Conditions associated with elevated PSA
Conditions associated with elevated monoclonal globulin
Conditions associated with elevated CA19-9
Conditions associated with elevated CD 30
Conditions associated with elevated CD 25
Which of the following statements describes the mechanism of action of cyclophosphamide accurately?
A. Forms covalent bonds with DNA bases, leading to cross-linkage of DNA strands
B. Interferes with purine synthesis, conveying the greatest toxicity to cells in the S-phase
C. Creates double stranded breaks through which another segment of DNA duplex passes before rejoining
D. Binds to DNA through the DNA minor groove eventually leading to the disruption of the FUS-CHOP transcription action
Option A is the mechanism of action of alkylating agents such as cyclophosphamide (cell cycle nonspecific).
Option B is the MOA of anti-metabolites (like 5FU or capecitabine).
Option C is the MOA of Top-2 inhibitors (like doxorubicin), and
option D is the specific MOA of trabectedin, another alkylating agent
The efficacy of which drug is enhanced by leucovorin by increasing the binding of a ternary complex with thymidylate synthase?
A. Methotrexate
B. 5-fluorouracil
C. Pemetrexed
D. 6-Thioguanine
The action of 5-fluorouracil is synergistic with leucovorin.
Option A is incorrect because leucovorin lessens the toxicity of methotrexate to normal tissues (folate rescue, otherwise cells die a thymine-less death) .
Options C and D are also incorrect because leucovorin has no role in enhancing their efficacy.
Additional information: Pemetrexed: give folate and VitB12 to reduce hematologic toxicity 6-thioguanine: Increased toxicity with thiopurine methyltransferase deficiency
Which mechanism explains early diarrhea, occurring less than 24 hours after irinotecan administration?
A. Acetylcholinesterase inhibition by the prodrug
B. Acetylcholinesterase inhibition by the active metabolite, SN-38
C. Direct mucosal cytotoxicity from the prodrug
D. Direct mucosal cytotoxicity by the active metabolite, SN-38
Early diarrhea is caused by acetylcholinesterase inhibition by the prodrug, Irinotecan. In order to prevent this, patients are premedicated with atropine. Late diarrhea occurs due to direct mucosal cytotoxicity by the active metabolite, SN-38. For late diarrhea, use loperamide 4mg after the first stool then 2mg Q2 hours until 12h without stool (max 16mg/24h)
This antibody drug conjugate (ADC) uses an antibody to NECTIN 4 to treat advanced urothelial neoplasms expressing this target. Internalization of the ADC-Nectin complex allows the release of auristatin, an antimicrotubule.
A. Belantamab mafodotin
B. Ziv-aflibercept
C. Ado-trastuzumab emtansine
D. Enfortumab vedotin
This is the MOA of Enfortumab vedotin
Belantamab mafodotin targets B-cell maturation (BCMA) expressed myeloma, ziv-aflibercept targets VEGF and is used in colorectal cancer with 5fubased chemotherapy.
Ado-trastuzumab emtansine targets Her2/neu receptors as treatment in advanced breast cancer
Which agent may be given to patients with metastatic prostate cancer to inhibit androgen synthesis by blocking the action of CYP17A1? To counteract adverse events related to mineralocorticoid excess, this is often given together with corticosteroids.
A. Abiraterone
B. Leuprolide
C. Enzalutamide
D. Relugolix
Abiraterone inhibits the action of CYP17A1, thus preventing androgen biosynthesis
Leuprolide is an LHRH agonist, while Relugolix is a GNRH antagonist, preventing the release of LH and FSH, and consequently testosterone.
Enzalutamide is a second generation androgen receptor (AR) antagonist inhibiting androgen binding to AR, androgen receptor nuclear translocation, and subsequent interaction with chromosomal DNA for signaling