1
ONS Fundamentals of Chemotherapy Immunotherapy
Exam Actual Exam 2026/2027 | Complete Test Bank
with Verified Questions & Answers | Oncology
Nursing Society Certification Prep | A+ Graded
SECTION 1: FOUNDATIONS OF ONCOLOGY NURSING
Q1: A patient is diagnosed with breast cancer. The pathology report indicates the tumor is
"poorly differentiated" with a high mitotic rate. This finding suggests:
A. The tumor is slow-growing and less aggressive
B. The tumor cells closely resemble normal breast tissue
C. The tumor is aggressive with rapid cell division. [CORRECT]
D. The tumor is confined to the ductal system
Correct Answer: C
Rationale: Poorly differentiated tumors have lost the characteristics of the tissue of origin
(anaplasia) and are associated with more aggressive behavior. A high mitotic rate indicates rapid
cell division (C). Well-differentiated tumors (B) closely resemble normal tissue and are less
aggressive. Slow-growing (A) is the opposite. Confined to ducts (D) describes ductal carcinoma
in situ (DCIS), not differentiation grade.
Q2: A patient with colon cancer is staged as T3N1M0 using the TNM system. What does this
staging indicate?
A. Tumor invades submucosa, no node involvement, no metastasis
B. Tumor invades muscularis propria, 1-3 regional nodes involved, no distant metastasis.
[CORRECT]
C. Tumor invades adjacent structures, 4-6 nodes involved, distant metastasis present
D. Tumor in situ, no node involvement, no metastasis
Correct Answer: B
Rationale: In TNM staging for colon cancer, T3 indicates invasion through the muscularis
propria into pericolorectal tissues. N1 indicates metastasis in 1-3 regional lymph nodes. M0
indicates no distant metastasis (B). Tis (D) is carcinoma in situ. T2 (A) invades muscularis
propria but not through it. T4 (C) invades adjacent organs/structures.
,2
Q3: Which phase of the cell cycle is characterized by DNA synthesis and chromosome
replication?
A. G1 phase
B. S phase. [CORRECT]
C. G2 phase
D. M phase
Correct Answer: B
Rationale: The S phase (synthesis phase) is when DNA replication occurs and each chromosome
is duplicated (B). G1 phase (A) is the first gap phase where cell growth occurs. G2 phase (C) is
the second gap phase where the cell prepares for division. M phase (D) is mitosis where cell
division occurs.
Q4: A tumor suppressor gene that prevents damaged cells from progressing through the cell
cycle is:
A. RAS
B. MYC
C. p53. [CORRECT]
D. HER2
Correct Answer: C
Rationale: p53 is a tumor suppressor gene that functions as the "guardian of the genome,"
arresting the cell cycle to allow DNA repair or initiating apoptosis if damage is irreparable (C).
RAS (A) and MYC (B) are oncogenes that promote cell growth when mutated. HER2 (D) is a
growth factor receptor oncogene.
Q5: The process of carcinogenesis involving the conversion of a normal cell to a cancer cell
through genetic mutation is called:
A. Promotion
B. Progression
C. Initiation. [CORRECT]
D. Metastasis
Correct Answer: C
Rationale: Initiation is the first stage of carcinogenesis where irreversible genetic damage occurs
in a normal cell, creating the potential for cancer development (C). Promotion (A) involves
,3
clonal expansion of initiated cells. Progression (B) is the transformation of benign to malignant
lesions. Metastasis (D) is the spread of cancer to distant sites.
Q6: Which characteristic of cancer cells allows them to break through the basement membrane
and invade surrounding tissues?
A. Angiogenesis
B. Loss of contact inhibition
C. Production of proteolytic enzymes. [CORRECT]
D. Dedifferentiation
Correct Answer: C
Rationale: Cancer cells produce proteolytic enzymes (such as matrix metalloproteinases) that
degrade the extracellular matrix and basement membrane, enabling invasion into surrounding
tissues (C). Angiogenesis (A) is new blood vessel formation. Loss of contact inhibition (B)
allows uncontrolled growth. Dedifferentiation (D) refers to loss of specialized features.
Q7: A chemotherapy agent that is effective against cells in all phases of the cell cycle, including
G0, is described as:
A. Cell cycle phase-specific
B. Cell cycle phase-nonspecific. [CORRECT]
C. Schedule-dependent
D. S-phase specific
Correct Answer: B
Rationale: Cell cycle phase-nonspecific agents (such as alkylating agents and nitrosoureas) can
damage DNA in any phase of the cell cycle, including resting cells in G0 (B). Phase-specific
agents (A, D) are most effective during specific phases. Schedule-dependent agents (C) require
specific timing for optimal effect.
Q8: Which principle explains why combination chemotherapy regimens are often more effective
than single agents?
A. Log kill hypothesis
B. Norton-Simon hypothesis
C. Goldie-Coldman hypothesis. [CORRECT]
D. Skipper's laws
, 4
Correct Answer: C
Rationale: The Goldie-Coldman hypothesis states that tumor cells spontaneously develop drug
resistance through mutation; using multiple agents with different mechanisms reduces the
probability of resistance developing to all agents simultaneously (C). Log kill (A) describes cell
kill proportion. Norton-Simon (B) relates to dose density. Skipper's laws (D) describe tumor
growth kinetics.
Q9: A patient asks why they need both chemotherapy and radiation therapy. The nurse explains
that radiation is primarily:
A. Systemic therapy targeting micrometastases
B. Local therapy targeting a specific tumor site. [CORRECT]
C. Immunotherapy activating the immune system
D. Hormonal therapy blocking tumor growth
Correct Answer: B
Rationale: Radiation therapy is a local treatment modality that delivers ionizing radiation to a
specific tumor site to damage DNA and kill cancer cells (B). Chemotherapy is systemic (A).
Immunotherapy (C) and hormonal therapy (D) are distinct systemic treatment categories.
Q10: Which cellular process is targeted by antimetabolite chemotherapy agents?
A. DNA cross-linking
B. Microtubule formation
C. DNA/RNA synthesis. [CORRECT]
D. Topoisomerase enzyme function
Correct Answer: C
Rationale: Antimetabolites are structural analogs of normal metabolites that interfere with DNA
and RNA synthesis by inhibiting enzymes required for nucleotide production or by being
incorporated into nucleic acids (C). DNA cross-linking (A) is the mechanism of alkylating
agents. Microtubule inhibition (B) is the mechanism of plant alkaloids. Topoisomerase inhibition
(D) is a separate drug class.
Q11: The principle of "dose intensity" in chemotherapy refers to:
A. The total cumulative dose administered over the entire treatment course
B. The dose delivered per unit of time. [CORRECT]
C. The maximum tolerated dose for an individual patient
D. The dose adjusted for body surface area
ONS Fundamentals of Chemotherapy Immunotherapy
Exam Actual Exam 2026/2027 | Complete Test Bank
with Verified Questions & Answers | Oncology
Nursing Society Certification Prep | A+ Graded
SECTION 1: FOUNDATIONS OF ONCOLOGY NURSING
Q1: A patient is diagnosed with breast cancer. The pathology report indicates the tumor is
"poorly differentiated" with a high mitotic rate. This finding suggests:
A. The tumor is slow-growing and less aggressive
B. The tumor cells closely resemble normal breast tissue
C. The tumor is aggressive with rapid cell division. [CORRECT]
D. The tumor is confined to the ductal system
Correct Answer: C
Rationale: Poorly differentiated tumors have lost the characteristics of the tissue of origin
(anaplasia) and are associated with more aggressive behavior. A high mitotic rate indicates rapid
cell division (C). Well-differentiated tumors (B) closely resemble normal tissue and are less
aggressive. Slow-growing (A) is the opposite. Confined to ducts (D) describes ductal carcinoma
in situ (DCIS), not differentiation grade.
Q2: A patient with colon cancer is staged as T3N1M0 using the TNM system. What does this
staging indicate?
A. Tumor invades submucosa, no node involvement, no metastasis
B. Tumor invades muscularis propria, 1-3 regional nodes involved, no distant metastasis.
[CORRECT]
C. Tumor invades adjacent structures, 4-6 nodes involved, distant metastasis present
D. Tumor in situ, no node involvement, no metastasis
Correct Answer: B
Rationale: In TNM staging for colon cancer, T3 indicates invasion through the muscularis
propria into pericolorectal tissues. N1 indicates metastasis in 1-3 regional lymph nodes. M0
indicates no distant metastasis (B). Tis (D) is carcinoma in situ. T2 (A) invades muscularis
propria but not through it. T4 (C) invades adjacent organs/structures.
,2
Q3: Which phase of the cell cycle is characterized by DNA synthesis and chromosome
replication?
A. G1 phase
B. S phase. [CORRECT]
C. G2 phase
D. M phase
Correct Answer: B
Rationale: The S phase (synthesis phase) is when DNA replication occurs and each chromosome
is duplicated (B). G1 phase (A) is the first gap phase where cell growth occurs. G2 phase (C) is
the second gap phase where the cell prepares for division. M phase (D) is mitosis where cell
division occurs.
Q4: A tumor suppressor gene that prevents damaged cells from progressing through the cell
cycle is:
A. RAS
B. MYC
C. p53. [CORRECT]
D. HER2
Correct Answer: C
Rationale: p53 is a tumor suppressor gene that functions as the "guardian of the genome,"
arresting the cell cycle to allow DNA repair or initiating apoptosis if damage is irreparable (C).
RAS (A) and MYC (B) are oncogenes that promote cell growth when mutated. HER2 (D) is a
growth factor receptor oncogene.
Q5: The process of carcinogenesis involving the conversion of a normal cell to a cancer cell
through genetic mutation is called:
A. Promotion
B. Progression
C. Initiation. [CORRECT]
D. Metastasis
Correct Answer: C
Rationale: Initiation is the first stage of carcinogenesis where irreversible genetic damage occurs
in a normal cell, creating the potential for cancer development (C). Promotion (A) involves
,3
clonal expansion of initiated cells. Progression (B) is the transformation of benign to malignant
lesions. Metastasis (D) is the spread of cancer to distant sites.
Q6: Which characteristic of cancer cells allows them to break through the basement membrane
and invade surrounding tissues?
A. Angiogenesis
B. Loss of contact inhibition
C. Production of proteolytic enzymes. [CORRECT]
D. Dedifferentiation
Correct Answer: C
Rationale: Cancer cells produce proteolytic enzymes (such as matrix metalloproteinases) that
degrade the extracellular matrix and basement membrane, enabling invasion into surrounding
tissues (C). Angiogenesis (A) is new blood vessel formation. Loss of contact inhibition (B)
allows uncontrolled growth. Dedifferentiation (D) refers to loss of specialized features.
Q7: A chemotherapy agent that is effective against cells in all phases of the cell cycle, including
G0, is described as:
A. Cell cycle phase-specific
B. Cell cycle phase-nonspecific. [CORRECT]
C. Schedule-dependent
D. S-phase specific
Correct Answer: B
Rationale: Cell cycle phase-nonspecific agents (such as alkylating agents and nitrosoureas) can
damage DNA in any phase of the cell cycle, including resting cells in G0 (B). Phase-specific
agents (A, D) are most effective during specific phases. Schedule-dependent agents (C) require
specific timing for optimal effect.
Q8: Which principle explains why combination chemotherapy regimens are often more effective
than single agents?
A. Log kill hypothesis
B. Norton-Simon hypothesis
C. Goldie-Coldman hypothesis. [CORRECT]
D. Skipper's laws
, 4
Correct Answer: C
Rationale: The Goldie-Coldman hypothesis states that tumor cells spontaneously develop drug
resistance through mutation; using multiple agents with different mechanisms reduces the
probability of resistance developing to all agents simultaneously (C). Log kill (A) describes cell
kill proportion. Norton-Simon (B) relates to dose density. Skipper's laws (D) describe tumor
growth kinetics.
Q9: A patient asks why they need both chemotherapy and radiation therapy. The nurse explains
that radiation is primarily:
A. Systemic therapy targeting micrometastases
B. Local therapy targeting a specific tumor site. [CORRECT]
C. Immunotherapy activating the immune system
D. Hormonal therapy blocking tumor growth
Correct Answer: B
Rationale: Radiation therapy is a local treatment modality that delivers ionizing radiation to a
specific tumor site to damage DNA and kill cancer cells (B). Chemotherapy is systemic (A).
Immunotherapy (C) and hormonal therapy (D) are distinct systemic treatment categories.
Q10: Which cellular process is targeted by antimetabolite chemotherapy agents?
A. DNA cross-linking
B. Microtubule formation
C. DNA/RNA synthesis. [CORRECT]
D. Topoisomerase enzyme function
Correct Answer: C
Rationale: Antimetabolites are structural analogs of normal metabolites that interfere with DNA
and RNA synthesis by inhibiting enzymes required for nucleotide production or by being
incorporated into nucleic acids (C). DNA cross-linking (A) is the mechanism of alkylating
agents. Microtubule inhibition (B) is the mechanism of plant alkaloids. Topoisomerase inhibition
(D) is a separate drug class.
Q11: The principle of "dose intensity" in chemotherapy refers to:
A. The total cumulative dose administered over the entire treatment course
B. The dose delivered per unit of time. [CORRECT]
C. The maximum tolerated dose for an individual patient
D. The dose adjusted for body surface area
