Exam III Oncology Flashcards

(43 cards)

1
Q

Cancer Cell Characteristics

A

Uncontrolled cellular growth

Ability to invade adjacent structures and/or travel to distant areas

Incapable of physiologic functions of the mature tissue of origin

Altered proteins, enzyme systems, membrane characteristics, and cytogenetics

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2
Q

Cancer treatment types

A

Radiation

Surgery

Chemotherapy

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3
Q

Anti-Cancer Therapy

A

Cytotoxic therapies

Anti-hormonal therapies

Targeted therapies

Immunotherapy

Blood and marrow transplant (BMT)

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4
Q

Tumor Staging and treatment terminology

A

TNM Staging (Tumor, Nodal status, Metastasis) for Solid Tumors (Stage I, II, III, IV)

Adjuvant chemotherapy:

-Given after surgery to reduce risk of local and systemic recurrence

Neoadjuvant chemotherapy:

-Given prior to surgical intervention to reduce tumor size or to remove micrometastases

Oncogene

Tumor suppressor gene

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5
Q

Anticancer Drugs

A

Alkylating agents

-Cyclophosphamide, Cisplatin

Protease Inhibitor

-Bortezomib, Carfilzomib

Antimetabolites

-5-Fluorouracil, Methotrexate, Gemcitabine, 6-Mercaptopurine

Natural Products

-Etoposide, Paclitaxel, Vincristine

Antitumor antibiotics

-Bleomycin, Doxorubicin, Mitomycin

Hormonal

-Prednisone, Tamoxifen

Misc

-Imatinib, Cetuximab

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6
Q

Cytotoxic Chemotherapy

A

Traditional

Toxic to all cells, but more specific for rapidly dividing cells

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7
Q

Tumor Growth Kinetics

A

Doubling time

-Time needed for a tumor cell population to double in size

Gomperzian growth

-Early growth is exponential, but as tumor gets bigger, growth slows due to decreased nutrients/blood supply

Log-kill hypothesis

A given dose of chemotherapy kills the same fraction of tumor cells regardless of the size of the tumor at the time of treatment

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8
Q

Principles of Cytotoxic Chemotherapy - Combination chemotherapy or “Regimen”

A

Good single-agent activity against tumor

Different mechanism of action

Different toxicities or different onset of toxicities

Maximum cell kill within toxicity limits

Different mechanisms of action to target a cancer

Decrease drug resistance

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9
Q

Principles of Cytotoxic Chemotherapy - Dosing / Admin

A

Dosing

-Dose usually based on body surface area (BSA)

–Also mg/kg dosing or flat dosing

-Which weight to use

–Ideal, actual, adjusted

Administration

  • Cycles every 14, 21, or 28 days most common
  • Dose intensity and dose density
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10
Q

Alkylating agents - MoA

A

Prevents cell division by cross-linking DNA strands and decreasing DNA synthesis

Cell cycle non-specific

Myelosuppression is generally the dose-limiting toxicity

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11
Q

Alkylating Agents

A

Cyclophosphamide, Ifosfamide

Cisplatin, Oxaliplatin

Carboplatin,

Carmustine, Lomustine

Busulfan, Melphalan

Chlorambucil

Mechlorethamine

Temozolomide/Dacarbazine

Mechlorethamine

Streptozocin

Thiotepa

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12
Q

Alkylating agents: Common Toxicity

A

Nausea/Vomiting

  • Mostly acute - some delay
  • Often moderately to highly emetogenic

Myelosuppression

Alopecia

Sterility/Infertility

Secondary Malignancies

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13
Q

Alkylating Agents: Specific Toxicities

A

Cyclophosphamide/Ifosfamide

-Hemorrhagic cystitis (primarily Ifosfamide) due to acrolein metabolite

–Mesna

Cisplatin

  • Nephrotoxicity
  • N/V (acute and delayed)
  • Ototoxicity

Oxaliplatin

-Neuropathies (exacerbated by cold temperatures)

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14
Q

Antimetabolites

A

Structural analogues of naturally occurring substances necessary for specific biochemical reactions

  • Compete with normal metabolites or
  • Falsely insert themselves for a metabolite normally incorporated into DNA and RNA

Most commonly active in the S phase

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15
Q

DNA and RNA Bases

A

Purine Bases: A and G

Pyrimidine bases: T (DNA), U (RNA), and C

De-Novo base synthesis or salvaged bases used in building DNA and RNA

Continuously dividing cells favor using de novo synthetic pathway

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16
Q

Antimetabolites Most Important

A

Capecitabine

Cytarabine

Fluorouracil

Methotrexate

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17
Q

Antimetabolites Rest

A

Azacitidine

Cladribine

Clofarabine

Decitabine

Fludarabine

Gemcitabine

Methotrexate

Mercaptopurine

Nelarabine

Pentostatin

Pemetrexed

Pralatrexate

Thioguanine

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18
Q

Metabolites that use DHFR

A

Methotrexate

Flourouracil

19
Q

Antimetabolites: Toxicities

A

Common toxicities: myelosuppression, mucositis, mild N/V/D

Methotrexate (MTX)

Renal toxicity

Leucovorin rescue for high dose (>1 gm/m2)

Cytarabine

High dose therapy: nervous system (cerebellar) toxicity

Ocular irritation - eye drops

Fluorouracil (leucovorin)

Capecitabine: Hand-foot syndrome

20
Q

Natural Products

A

Antitumor antibiotics

Plant alkaloids

Vinca alkaloids

Taxanes

Topoisomerase I & II

Marine-based products

Enzymes

21
Q

Antitumor Antibiotics

A

Anthracyclines - block DNA and RNA transcription

Daunorubicin - Lifetime dose Limit

Doxorubicin - Lifetime dose limit

Epirubicin

Idarubicin

Mitoxantrone

Mitomycin - cross-links DNA

Dactinomycin - blocks RNA synthesis

Bleomycin - inhibits DNA synthesis (only cell-cycle specific agent)

Doxorubicin – Streptomyces peucetius

Bleomycin – Streptomyces certicillus

Mitomycin – Streptomyces caespitosus

Dactinomycin – Streptomyces parvulus

22
Q

Antitumor Antibiotics - Toxicities

A

N/V, alopecia, stomatitis, myelosuppression

Bleomycin: lung toxicity - pulmonary fibrosis, interstitial pneumonitis

Lifetime max 400 units

Anthracyclines: cardiotoxicity - CHF

Lifetime max dose (doxorubicin 450 mg/m2 or equivalent)

23
Q

Dose-Dependent Cardiotoxicity of Anthracyclines

24
Q

Antitumor Antibiotics - Myocardiotoxicity

A

Myocardiotoxicity (dose-dependent):

Production of toxic free radicals, membrane lipid peroxidation leading to irreversible damage and replacement by fibrous tissue

Risk Factors: Cumulative dose, PT age, concomitant chemotherapy, with known cardiotoxicity, radiation therapy

Early Toxicity: HF can develop within 3 months following completion

Late toxicity: Symptoms may appear one decade following completion

Dexrazoxane MOA: EDTA-like chelating agent, binds intracellular iron releaeed following lipid peroxidation

25
Natural Products - Microtubule agents
M-Phase **Synthetic and semi-synthetic** **Diffuse mechanisms of action** **Vinca alkaloids prevent microtubule assembly** **Taxanes prevent microtubule disassembly**
26
Plant Alkaloids: Microtubule Toxicities
**Taxanes** Docetaxel - neuropathies, peripheral edema, hypersensitivity reactions Paclitaxel - neuropathies, hypersensitivity reactions -Premedicate with H1 and H2 blocker + steroid **Vinca Alkaloids** Vincristine - neuropathies, constipation, DO NOT give intrathecally Vinblastine Vinorelbine - myelosuppression
27
Natural Products and Toxicities
**Topoisomerase I inhibitors** _Irinotecan_, Topotecan **Topoisomerase II inhibitors** Etoposide, Teniposide **Enzyme** Asparaginase, Pegaspargase **Irinotecan - diarrhea (2 phases)** Immediate - cholinergic reaction Delayed - Ioperamide, Diphenoxylate/Atropine **_Etoposide_ - secondary cancers** **Asparaginase - hypersensitivity reaction, hyperglycemia, pancreatitis, coagulopathies** E Coli-drevived PEGylated, Erwinia-derived
28
Natural Products-**Marine-based products**
**Eribulin - Sea sponge** Microtubule-like Agents Toxicities: Fatigue, peripheral neuropathy, CINV **Trabectedin - Sea squirt** Mechanism - somewhat like an alkylating agent Toxicities: fatigue, hand-foot syndrome, CINV, hepatic damage
29
Hormonal Treatment
Blocks production of hormones or hormone receptors in the body Anti-estrogens Anti-androgens Luteinizing hormone-releasing hormone (LHRH) analogs Ex: breast, prostate cancer
30
Hormone Therapy Chart
31
Hormonal Therapy: Prostate Cancer
**LHRH agonists** Inhibit the pituitary (through negative feedback) from releasing LH and FSH which stops stimulation of the testes to produce testosterone (can also be used in breast cancer with same MOA but stops stimulation of ovaries to produce estrogen) Tumor flare Leuprolide, Goserelin, Triptorelin **LHRH antagonists** Directly inhibits pituitary from releasing LH and FSH Degarelix **Antiandrogens** Blocks Androgen receptors Bicalutamide, Flutamide, Nilutamide, Enzalutamide, Apalutamide Abiraterone
32
HPT Axis
33
Targeted Agents
Identifies certain features of a cancer cell that make it different from the normal cell Prevents Tumor cells from entering cell cycle or target signals that trigger cancer growth, metastasis, and immortality Monoclonal antibodies Antibodies that match an antigen on the cancer cell surface Molecularly targeted therapies Block signalling inside the cell
34
Targeted Agents names/types
35
Targets of targeted agents
**VEGF signalling pathway (VSP) inhibitors** (VEGF(R) inhibitors - vascular endothelial growth factor (receptor)) HTN, proteinuria, bleeding, impaired wound healing HTN may indicate effectiveness Bevacizumab, Sunitinib, Pazopanib, Regorafenib, ETC. **EGFR inhibitors - epidermal growth factor receptor** Acneiform rash Rash may indicate effectiveness Erlotinib, Gefitinib, Alectinib, Cetuximab, Panitumumab
36
EGFR Acneform RAsh
37
Targets PT-II
**mTOR inhibitors - mammalian Target of Rapamycin** Hyperglycemia, dyslipidemia, mucosal sensitivity, ulcers Drug interactions - 3A4 Everolimus, sirolimus, temsirolimus **BCR-ABL mutation inhibition -** Imatinib (edema, N/V), Dasatinib (neutropenia, edema, N/V), Nilotinib (N/V, fatigue), Ponatinib (cardiac), Bosutinib (N/V/D) CYP3A4 substrates (except ponatinib) so drug interactions possible Imantinib also a 3A4 inhibitor
38
mTOR inhibitor Toxicities
39
Specific Targets
**CD20 - Rituximab, Ofatumumab, Obinutuzumab - (infusion RXN, myelosuppression)** **HER2 inhibition - human epidermal growth factor receptor - 2** Trastuzumab, Pertuzumab - Cardiotoxicity Lapatinib - N/V/D, fatigue, hand-foot syndrome; drug interactions with strong 3A$ inducers/inhibitors (also cardiotoxicity as it is a HER2 INH)
40
Targeted Agents: Toxicities (MABS)
**MAB: Brentuximab (neuropathy), Vemurafenib (Colitis), Bortezomab (Neuropathies)** Potential hypersensitivity reactions based on mAB origin QT prolongation Nilotinib, Pazopanib, Ponatinib Fatigue, hair thinning Low grade (if at all) N/V Myelosuppression
41
Targeted Agent Toxicities
**Hair depigmentation (and repigmentation)** **Dysphonia** **Hypothyroidism** Sunitinib, Pazopanib, Regorafenib
42
Immunological Therapies
INF Interleukin Lenalidomide Thalidomide CTLA-4 inhibitors PD-1 inhibitors Cancer Vaccine
43
PD-1 and PD-L1 Inhibitor
**Pembrolizumab** ?? Big adverse effects LO