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AOCNP practice questions

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Question 1Science of Oncology

Which term describes the ability of a malignant cell to spread from its original site to a distant organ?

  1. Angiogenesis
  2. Apoptosis
  3. Metastasis Correct answer.
  4. Invasion

Explanation

Metastasis is the process by which cancer cells disseminate from a primary tumor, survive in the circulation or lymphatics, and establish growth at a distant site. Invasion refers to local extension through tissue barriers, not distant spread.

Question 2Science of Oncology

A mutation that inactivates a tumor suppressor gene most directly promotes cancer by:

  1. Increasing DNA repair fidelity
  2. Activating a growth factor receptor
  3. Enhancing immune surveillance
  4. Removing a brake on cell-cycle progression Correct answer.

Explanation

Tumor suppressor genes normally restrain proliferation, repair DNA, or promote apoptosis; loss of function removes these restraints. Oncogenes, in contrast, are activated by gain-of-function mutations.

Question 3Science of Oncology

Which class of gene is activated by a gain-of-function mutation that drives unregulated cell proliferation?

  1. DNA mismatch repair gene
  2. Tumor suppressor gene
  3. Proto-oncogene Correct answer.
  4. Apoptosis effector gene

Explanation

A proto-oncogene becomes an oncogene when gain-of-function mutations or amplifications cause excessive or constitutive growth signaling. Tumor suppressor and DNA repair genes generally require loss of function to promote cancer.

Question 4Science of Oncology

The G1/S checkpoint primarily prevents a cell from:

  1. Exiting quiescence after nutrient signals
  2. Entering S phase with damaged DNA Correct answer.
  3. Separating chromatids during anaphase
  4. Repairing double-strand breaks by recombination

Explanation

The G1/S checkpoint assesses DNA integrity and cell size before DNA replication begins. Cells with unrepaired DNA damage arrest before S phase to allow repair.

Question 5Science of Oncology

Which route of metastasis is most characteristic of carcinomas spreading to regional lymph nodes?

  1. Transcoelomic spread
  2. Perineural spread
  3. Hematogenous spread
  4. Lymphatic spread Correct answer.

Explanation

Carcinomas commonly metastasize first through lymphatic channels to regional lymph nodes. Sarcomas more often spread hematogenously, while transcoelomic and perineural patterns are seen in selected tumors.

Question 6Science of Oncology

Which statement best distinguishes tumor grade from tumor stage?

  1. Grade reflects differentiation; stage reflects anatomic extent. Correct answer.
  2. Grade reflects anatomic extent; stage reflects differentiation.
  3. Grade applies only to leukemias; stage applies only to solid tumors.
  4. Grade is set by tumor markers; stage is set by biopsy.

Explanation

Grade describes how closely tumor cells resemble normal tissue and how rapidly they appear to divide. Stage describes the anatomic extent of disease, including tumor size, nodal involvement, and metastasis.

Question 7Science of Oncology

A patient with small cell lung cancer develops hyponatremia from ectopic ADH. Which paraneoplastic syndrome is this?

  1. Parathyroid hormone-related peptide causing hypercalcemia
  2. Antidiuretic hormone causing hyponatremia Correct answer.
  3. Ectopic corticotropin causing Cushing syndrome
  4. Serotonin causing carcinoid syndrome

Explanation

Small cell lung cancer can secrete ectopic antidiuretic hormone, producing SIADH with euvolemic hyponatremia. This is distinct from ectopic ACTH, PTHrP-mediated hypercalcemia, or serotonin excess.

Question 8Science of Oncology

After myelosuppressive chemotherapy, the neutrophil count typically reaches its nadir at approximately which time?

  1. 21 to 28 days
  2. 7 to 14 days Correct answer.
  3. 24 hours
  4. 3 to 5 days

Explanation

The neutrophil nadir after many myelosuppressive regimens occurs at about 7 to 14 days, depending on the drugs used. Counts usually recover by around 21 to 28 days.

Question 9Science of Oncology

Overexpression of BCL-2 in a lymphoma cell promotes malignancy mainly by:

  1. Accelerating DNA replication
  2. Increasing antigen presentation
  3. Blocking cytochrome c release and apoptosis Correct answer.
  4. Activating caspase-8 at death receptors

Explanation

BCL-2 is an antiapoptotic mitochondrial protein that prevents cytochrome c release and caspase activation. This allows malignant lymphocytes to survive instead of undergoing programmed cell death.

Question 10Science of Oncology

Vascular endothelial growth factor contributes to tumor progression primarily by:

  1. Increasing mismatch repair activity
  2. Activating proto-oncogenes inside tumor cells
  3. Promoting antibody-dependent cellular cytotoxicity
  4. Stimulating endothelial growth and vessel leakiness Correct answer.

Explanation

VEGF drives angiogenesis by stimulating endothelial cell proliferation, survival, and vascular permeability. These new vessels support tumor growth and can facilitate dissemination.

Question 11Science of Oncology

Binding of PD-L1 on tumor cells to PD-1 on T cells produces which effect?

  1. Enhanced T-cell receptor signaling
  2. Complement-mediated tumor lysis
  3. Reduced T-cell activation and effector function Correct answer.
  4. Increased major histocompatibility complex expression

Explanation

PD-L1 engagement of PD-1 delivers an inhibitory signal that dampens T-cell activation, proliferation, and cytotoxic function. Tumors exploit this checkpoint to evade immune attack.

Question 12Science of Oncology

A germline BRCA1 mutation chiefly increases cancer risk by impairing which process?

  1. Homologous recombination repair Correct answer.
  2. Base excision repair of oxidized bases
  3. Mismatch repair of replication errors
  4. Nucleotide excision repair of bulky adducts

Explanation

BRCA1 and BRCA2 are required for homologous recombination repair of DNA double-strand breaks. Loss of this pathway causes genomic instability and predisposes to breast, ovarian, and other cancers.

Question 13Science of Oncology

Lynch syndrome is caused by a germline defect in which DNA repair pathway?

  1. Mismatch repair Correct answer.
  2. Homologous recombination
  3. Nucleotide excision repair
  4. Nonhomologous end joining

Explanation

Lynch syndrome results from germline mutations in mismatch repair genes such as MLH1, MSH2, MSH6, or PMS2. Deficient mismatch repair leads to microsatellite instability and increased colorectal and endometrial cancer risk.

Question 14Science of Oncology

The Philadelphia chromosome in chronic myeloid leukemia creates which fusion gene?

  1. MYC-IGH
  2. PML-RARA
  3. EML4-ALK
  4. BCR-ABL1 Correct answer.

Explanation

The Philadelphia chromosome arises from a t(9;22) translocation that fuses BCR with ABL1. The resulting BCR-ABL1 tyrosine kinase drives chronic myeloid leukemia and is targeted by tyrosine kinase inhibitors.

Question 15Science of Oncology

Which tumor marker is most useful for monitoring disease activity in epithelial ovarian cancer?

  1. Alpha-fetoprotein
  2. Calcitonin
  3. CA-125 Correct answer.
  4. Carcinoembryonic antigen

Explanation

CA-125 is commonly elevated in epithelial ovarian cancer and is used to follow disease response or recurrence. It is not diagnostic by itself and can be elevated in other conditions.

Question 16Science of Oncology

A drug metabolized primarily by CYP3A4 is likely to have increased exposure when coadministered with which agent?

  1. Ketoconazole Correct answer.
  2. Phenytoin
  3. St. John's wort
  4. Rifampin

Explanation

Ketoconazole is a strong CYP3A4 inhibitor and can reduce metabolism of CYP3A4 substrates, increasing their plasma concentrations and toxicity risk. Rifampin, phenytoin, and St. John's wort are enzyme inducers.

Question 17Science of Oncology

Taxanes exert their cytotoxic effect mainly during which phase of the cell cycle?

  1. S phase
  2. G1 phase
  3. M phase Correct answer.
  4. G0 phase

Explanation

Taxanes stabilize microtubules and disrupt mitotic spindle dynamics, causing arrest and cell death during mitosis. They are therefore classified as M-phase cell-cycle-specific agents.

Question 18Science of Oncology

The oxygen enhancement ratio reflects that hypoxic tumor cells are:

  1. Equally sensitive to radiation regardless of oxygen
  2. Protected from radiation by antioxidant enzymes
  3. More resistant to radiation than oxygenated cells Correct answer.
  4. More sensitive to radiation than oxygenated cells

Explanation

Oxygen fixes radiation-induced free radical damage, so well-oxygenated cells are more radiosensitive. Hypoxic cells are relatively radioresistant, which contributes to treatment failure.

Question 19Science of Oncology

Which laboratory abnormality is most characteristic of tumor lysis syndrome?

  1. Hypokalemia with hypophosphatemia and hypouricemia
  2. Hyperuricemia with hyperkalemia and hyperphosphatemia Correct answer.
  3. Hypercalcemia with hypernatremia and metabolic alkalosis
  4. Hypouricemia with hypokalemia and metabolic acidosis

Explanation

Tumor lysis syndrome results from rapid release of intracellular contents and is characterized by hyperkalemia, hyperphosphatemia, and hyperuricemia, often with hypocalcemia. These abnormalities can cause renal failure and arrhythmias.

Question 20Science of Oncology

Which cytokine is most strongly implicated in cancer cachexia and anorexia?

  1. Tumor necrosis factor-alpha Correct answer.
  2. Transforming growth factor-beta
  3. Interferon-gamma
  4. Interleukin-4

Explanation

Tumor necrosis factor-alpha, often along with interleukin-6 and other inflammatory cytokines, contributes to anorexia, muscle wasting, and metabolic derangement in cancer cachexia.

Question 21Science of Oncology

The Warburg effect describes which metabolic phenotype of cancer cells?

  1. Exclusive reliance on oxidative phosphorylation for ATP
  2. Increased fatty acid oxidation with reduced glucose uptake
  3. High glycolytic flux to lactate despite adequate oxygen Correct answer.
  4. Complete glucose oxidation through the citric acid cycle

Explanation

The Warburg effect is aerobic glycolysis: cancer cells convert glucose to lactate even when oxygen is available. This supports biosynthesis and provides a metabolic advantage in the tumor microenvironment.

Question 22Science of Oncology

PARP inhibitors are selectively lethal to BRCA-deficient cancer cells because:

  1. PARP inhibitors hyperactivate mismatch repair
  2. Combined loss of homologous recombination and single-strand break repair is lethal Correct answer.
  3. BRCA-deficient cells depend entirely on nucleotide excision repair
  4. PARP inhibition restores BRCA1 expression

Explanation

PARP inhibitors impair single-strand break repair, and BRCA-deficient cells cannot reliably repair the resulting double-strand breaks by homologous recombination. This synthetic lethality preferentially kills tumor cells with BRCA pathway defects.

Question 23Science of Oncology

Intratumor genetic heterogeneity most directly complicates cancer treatment by:

  1. Preventing acquisition of drug resistance
  2. Supplying resistant subclones before therapy starts Correct answer.
  3. Making all cells equally drug-sensitive
  4. Reducing the tumor mutational burden

Explanation

Genetic heterogeneity means that resistant subclones may already exist before treatment, allowing them to expand under selective drug pressure. This is a major reason for acquired resistance and treatment failure.

Question 24Science of Oncology

CTLA-4 blockade enhances antitumor immunity primarily by:

  1. Directly activating natural killer cells through Fc receptors
  2. Blocking PD-L1 on tumor cells
  3. Dampening inhibitory signals during T-cell priming Correct answer.
  4. Depleting regulatory T cells exclusively within tumors

Explanation

CTLA-4 competes with CD28 for costimulatory ligands and delivers inhibitory signals during early T-cell activation in lymphoid tissue. Blocking CTLA-4 lowers this threshold and broadens T-cell activation.

Question 25Science of Oncology

A liquid biopsy that detects circulating tumor DNA is most limited by which factor?

  1. Low tumor DNA fraction in early-stage disease Correct answer.
  2. Rapid extracellular degradation of cell-free DNA
  3. Requirement for fresh frozen tissue samples
  4. Inability to detect specific somatic mutations

Explanation

Circulating tumor DNA can represent a very small fraction of cell-free DNA, particularly in early-stage or low-burden disease, reducing sensitivity. Assays can detect specific mutations and use blood rather than fresh tissue.

Question 26Science of Oncology

In the classic multistep model of carcinogenesis, which sequence best describes the progression from a normal cell to a malignant cell?

  1. Dysplasia, initiation, angiogenesis
  2. Promotion, initiation, metastasis
  3. Initiation, promotion, progression Correct answer.
  4. Transformation, invasion, initiation

Explanation

Initiation creates irreversible genetic damage, promotion drives clonal expansion of the initiated cell, and progression involves the acquisition of invasive and malignant characteristics. The other sequences place later events before earlier ones and do not reflect the established model.

Question 27Science of Oncology

Which event most commonly activates a proto-oncogene into an oncogene?

  1. Silencing by promoter hypermethylation
  2. A single gain-of-function mutation Correct answer.
  3. Loss of heterozygosity
  4. Deletion of both alleles

Explanation

Oncogenes behave dominantly, so a gain-of-function change in one allele can be sufficient to promote growth. Tumor suppressor genes, by contrast, typically require inactivation of both alleles.

Question 28Science of Oncology

The two-hit hypothesis of tumor suppressor genes predicts that cancer develops when:

  1. A proto-oncogene is translocated to a new locus
  2. Both alleles of a tumor suppressor gene are inactivated Correct answer.
  3. One allele is amplified
  4. A single allele acquires a gain-of-function mutation

Explanation

Knudson's two-hit hypothesis states that both copies of a tumor suppressor gene must be inactivated before its protective function is lost. In hereditary syndromes, one hit is inherited and the second is acquired somatically.

Question 29Science of Oncology

The G1/S checkpoint prevents a cell from entering S phase when:

  1. The spindle assembly checkpoint is satisfied
  2. DNA is damaged or growth signals are low Correct answer.
  3. Chromosomes have aligned at the metaphase plate
  4. Cytokinesis has completed

Explanation

The G1/S checkpoint evaluates DNA integrity and the presence of adequate growth signals before committing the cell to DNA replication. p53 and the RB pathway are central to this decision.

Question 30Science of Oncology

HER2 amplification in breast cancer is best described as which mechanism of proto-oncogene activation?

  1. Promoter methylation causing silencing
  2. Point mutation causing constitutive activation
  3. Gene amplification causing overexpression Correct answer.
  4. Chromosomal translocation creating a fusion gene

Explanation

HER2 is activated by amplification of the gene, producing many copies and marked overexpression of the receptor. This excess receptor signaling drives proliferation and is targeted by trastuzumab and similar agents.

Question 31Science of Oncology

Which alteration most directly allows a cancer cell to evade apoptosis?

  1. Loss of p53 function Correct answer.
  2. Increased caspase-9 activity
  3. Increased expression of pro-apoptotic Bax
  4. Decreased expression of anti-apoptotic BCL-2

Explanation

p53 normally senses DNA damage and can trigger apoptosis, so loss of p53 function permits damaged cells to survive. This is a common mechanism by which tumor cells escape programmed cell death.

Question 32Science of Oncology

Epithelial-mesenchymal transition contributes to metastasis primarily by:

  1. Increasing tumor cell proliferation rate
  2. Reducing E-cadherin and gaining motility Correct answer.
  3. Enhancing immune recognition of tumor cells
  4. Promoting apoptosis of disseminated cells

Explanation

Epithelial-mesenchymal transition reduces E-cadherin-mediated adhesion and increases migratory and invasive capacity, allowing cells to leave the primary tumor. Proliferation and immune recognition are separate processes.

Question 33Science of Oncology

Xeroderma pigmentosum increases skin cancer risk because of a defect in which DNA repair process?

  1. Homologous recombination
  2. Nucleotide excision repair Correct answer.
  3. Mismatch repair
  4. Nonhomologous end joining of double-strand breaks

Explanation

Nucleotide excision repair removes bulky DNA lesions such as ultraviolet-induced pyrimidine dimers. When this pathway is defective, unrepaired UV damage causes mutations that predispose to skin cancers.

Question 34Science of Oncology

Tumor-associated macrophages in the tumor microenvironment most often promote progression by:

  1. Increasing tumor antigen presentation to T cells
  2. Secreting growth factors and suppressing immunity Correct answer.
  3. Directly killing tumor cells through phagocytosis
  4. Reducing angiogenesis and matrix remodeling

Explanation

Many tumor-associated macrophages adopt an immunosuppressive, M2-like phenotype that releases growth factors, cytokines, and proangiogenic molecules. This favors tumor growth, immune evasion, and remodeling of the microenvironment.

Question 35Science of Oncology

The three phases of cancer immunoediting are best described as:

  1. Initiation, promotion, progression
  2. Elimination, equilibrium, escape Correct answer.
  3. Presentation, activation, effector
  4. Recognition, anergy, tolerance

Explanation

Cancer immunoediting begins with elimination of immunogenic tumor cells, followed by an equilibrium phase of immune selection, and finally escape of variants that evade immune control. This framework explains how tumors persist despite immune surveillance.

Question 36Science of Oncology

Overexpression of P-glycoprotein in cancer cells confers resistance to chemotherapy by:

  1. Enhancing drug activation by cytochrome P450
  2. Actively effluxing drugs from the cell Correct answer.
  3. Preventing drug binding to tubulin
  4. Increasing drug uptake into the cell

Explanation

P-glycoprotein is an ATP-binding cassette transporter that pumps many hydrophobic chemotherapeutic agents out of the cell. Increased efflux lowers intracellular drug concentrations and produces multidrug resistance.

Question 37Science of Oncology

In fractionated radiotherapy, reoxygenation improves tumor cell killing because:

  1. It synchronizes tumor cells into the most radiosensitive phase
  2. It allows normal tissues to accumulate more damage
  3. It increases the total radiation dose delivered
  4. It makes surviving hypoxic cells more oxygenated Correct answer.

Explanation

Hypoxic cells are relatively radioresistant because oxygen is needed to fix radiation-induced DNA damage. Between fractions, surviving hypoxic cells can become reoxygenated and therefore more sensitive to subsequent doses.

Question 38Science of Oncology

A patient with a homozygous DPYD deficiency is at highest risk of severe toxicity from which chemotherapy agent?

  1. Doxorubicin
  2. Capecitabine Correct answer.
  3. Paclitaxel
  4. Cisplatin

Explanation

Dihydropyrimidine dehydrogenase, encoded by DPYD, catabolizes fluoropyrimidines such as 5-fluorouracil and its oral prodrug capecitabine. Deficient patients cannot clear the drug normally and are at high risk of severe myelosuppression, mucositis, and other toxicities.

Question 39Science of Oncology

Hypercalcemia in a patient with squamous cell lung cancer is most commonly caused by:

  1. Ectopic production of parathyroid hormone
  2. Excess 1,25-dihydroxyvitamin D production by tumor cells
  3. Tumor secretion of PTH-related peptide Correct answer.
  4. Osteoblastic metastases causing calcium release

Explanation

Squamous cell carcinomas often secrete parathyroid hormone-related peptide, which mimics parathyroid hormone and increases bone resorption and renal calcium reabsorption. This is the most common paraneoplastic cause of hypercalcemia in solid tumors.

Question 40Science of Oncology

High-risk human papillomavirus promotes cervical carcinogenesis mainly through which viral proteins?

  1. E5 and E6, which activate receptor tyrosine kinases
  2. E1 and E2, which regulate viral replication
  3. L1 and L2, which form the viral capsid
  4. E6 and E7, which inactivate p53 and RB Correct answer.

Explanation

The high-risk HPV oncoproteins E6 and E7 respectively promote degradation of p53 and inactivation of retinoblastoma protein, disrupting cell-cycle control and apoptosis. This allows accumulation of mutations and malignant transformation.

Question 41Cancer Prevention, Detection, and Diagnosis

For an average-risk woman with no history of abnormal cytology, cervical cancer screening with cervical cytology should begin at what age?

  1. 21 years Correct answer.
  2. 18 years
  3. 25 years
  4. 30 years

Explanation

Cytology-based cervical cancer screening begins at age 21 regardless of age at first intercourse or HPV vaccination status. Women aged 21 to 29 are screened every 3 years, and those 30 and older may switch to co-testing or primary HPV testing. Screening before 21 is discouraged because cervical cancer is rare and transient HPV infections are common at younger ages.

Question 42Cancer Prevention, Detection, and Diagnosis

At what age does the U.S. Preventive Services Task Force recommend beginning colorectal cancer screening for average-risk adults?

  1. 50 years
  2. 55 years
  3. 45 years Correct answer.
  4. 40 years

Explanation

Average-risk colorectal cancer screening now begins at age 45, a change made because incidence in adults younger than 50 has been rising. Screening continues through age 75, with individualized decisions from 76 to 85. Earlier onset screening for higher-risk groups is driven by family history or hereditary syndromes.

Question 43Cancer Prevention, Detection, and Diagnosis

A 62-year-old current smoker is being evaluated for lung cancer screening with low-dose CT. What is the minimum cumulative tobacco exposure required to meet eligibility criteria?

  1. 20 pack-years Correct answer.
  2. 10 pack-years
  3. 30 pack-years
  4. 15 pack-years

Explanation

Eligibility for annual low-dose CT screening requires age 50 to 80, at least 20 pack-years of smoking, and current smoking or quitting within the past 15 years. Pack-years are calculated by multiplying packs smoked per day by years smoked. Patients who quit more than 15 years ago no longer meet criteria.

Question 44Cancer Prevention, Detection, and Diagnosis

At what age is routine HPV vaccination recommended for adolescents in the United States?

  1. 9 to 10 years
  2. 13 to 14 years
  3. 11 to 12 years Correct answer.
  4. 15 to 16 years

Explanation

Routine HPV vaccination is recommended at ages 11 to 12, with catch-up vaccination recommended through age 26. Vaccination may begin at age 9, and two doses are sufficient when the series starts before age 15. The vaccine prevents infections with the HPV types most strongly linked to cervical and oropharyngeal cancers.

Question 45Cancer Prevention, Detection, and Diagnosis

Pathogenic variants in BRCA1 and BRCA2 most strongly increase the lifetime risk of which cancer pair?

  1. Pancreatic and thyroid
  2. Lung and renal
  3. Breast and ovarian Correct answer.
  4. Colorectal and gastric

Explanation

BRCA1 and BRCA2 pathogenic variants confer markedly elevated lifetime risks of breast and ovarian cancer, along with smaller increases in pancreatic and prostate cancer risk. Risk-reducing salpingo-oophorectomy and enhanced breast surveillance are offered based on the specific gene involved. Genetic testing is offered when personal or family history meets testing criteria.

Question 46Cancer Prevention, Detection, and Diagnosis

In the TNM staging system, what does the T category describe?

  1. Distant metastasis
  2. Tumor differentiation
  3. Regional nodal spread
  4. Primary tumor extent Correct answer.

Explanation

The T category describes the size and local extent of the primary tumor, including invasion into adjacent structures. N describes regional lymph node involvement and M describes distant metastasis. Histologic grade is a separate descriptor and is not part of TNM.

Question 47Cancer Prevention, Detection, and Diagnosis

Which serum marker is used in the detection and monitoring of prostate cancer?

  1. Prostate-specific antigen Correct answer.
  2. CA 125
  3. Carcinoembryonic antigen
  4. CA 19-9

Explanation

Prostate-specific antigen is a serine protease produced by prostate epithelium and is used for screening discussions, treatment monitoring, and recurrence surveillance. Carcinoembryonic antigen is used mainly in colorectal cancer monitoring, CA 19-9 in pancreatic cancer, and CA 125 in ovarian cancer. Tumor markers support but do not replace tissue diagnosis.

Question 48Cancer Prevention, Detection, and Diagnosis

What is the minimum sunscreen sun protection factor generally recommended for reducing skin cancer risk?

  1. 15
  2. 30 Correct answer.
  3. 8
  4. 50

Explanation

Broad-spectrum sunscreen with an SPF of at least 30 is recommended, applied generously and reapplied at least every 2 hours during sun exposure. SPF 30 blocks approximately 97% of UVB radiation when applied correctly. Sunscreen should be combined with protective clothing, shade, and avoidance of tanning beds.

Question 49Cancer Prevention, Detection, and Diagnosis

After a completely normal average-risk screening colonoscopy with adequate bowel preparation and cecal intubation, when should the next colonoscopy be scheduled?

  1. 3 years
  2. 5 years
  3. 15 years
  4. 10 years Correct answer.

Explanation

A normal average-risk screening colonoscopy with high-quality preparation and complete intubation warrants a 10-year interval. Shorter intervals are used when adenomas are found, preparation is inadequate, or cecal intubation is not achieved. Documenting bowel preparation quality is essential because it determines whether a full interval can be applied.

Question 50Cancer Prevention, Detection, and Diagnosis

For a 40-year-old woman with a normal Pap and negative HPV co-test, what is the recommended interval to the next cervical cancer screening?

  1. Every 2 years
  2. Every 5 years Correct answer.
  3. Annually
  4. Every 3 years

Explanation

Co-testing with cytology plus HPV testing is performed every 5 years for women aged 30 to 65 when results are normal. This interval reflects the high negative predictive value of concurrent negative cytology and negative high-risk HPV testing. Annual screening is no longer recommended in any average-risk group.