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Abnormal Foundations of Oncology

CPR APPLICATIONS FOUNDATION · CHAPTER 11 · ABNORMAL

Abnormal Foundations of Oncology

Organize the chapter before drilling into individual CPR concepts.

Supplemental foundation map: this page orients the detailed CPR Applications for Chapter 11. It is not part of the canonical CPR object inventory.

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11.7 · SOURCE CPR FOUNDATION

Concept

Step 1 oncology is mechanism-first pattern recognition. The exam is usually asking how a cancer gains the ability to proliferate, survive, invade, spread, or evade immune destruction. Diagnosis names matter after the dominant malignant behavior is identified.

Pattern

Most vignettes provide a behavior clue: unchecked growth, apoptosis resistance, angiogenesis, immune evasion, invasion, metastasis, marrow replacement, or paraneoplastic signaling. Once the behavior is identified, the mechanism and clinical consequence become predictable.

Rule

  1. Identify the tumor behavior first. Ask what the cancer is doing.
  2. Map the behavior to a hallmark. Proliferation, survival, angiogenesis, invasion, immune evasion, and metastasis are core categories.
  3. Predict the clinical consequence. Spread pattern, cytopenias, systemic symptoms, or treatment vulnerability should follow.

Applications

  • Weight loss night sweats mass → malignancy-associated systemic signaling
  • Circulating blasts with cytopenias → consider acute leukemia or another marrow-disrupting process; confirm with further testing
  • New lesion in another organ in a patient with cancer → consider metastasis, but distinguish it from a second primary or benign lesion
  • Angiogenesis invasion immune evasion → advanced malignant behavior
  • Tip: Identify dominant behavior before naming tumor

CPR APPLICATIONS · ACTIVE REASONING

Identify malignant behavior

Make a prediction first. Each worked answer is available without JavaScript. These exercises do not save or send responses.

Decision 1: A carcinoma extends beyond the basement membrane. What is demonstrated?

Worked reasoning and transfer

Best answer: Invasion. Basement membrane penetration establishes invasive behavior.

Transfer: What additional steps permit distant spread?

Decision 2: A new distant lesion appears in a person with known cancer. What is justified?

Worked reasoning and transfer

Best answer: Consider metastasis and alternative causes. A second primary or benign lesion is also possible.

Transfer: What additional testing would help?

Decision 3: Blasts appear with anemia and thrombocytopenia. What broad mechanism is concerning?

Worked reasoning and transfer

Best answer: Marrow disruption by hematologic malignancy. Abnormal blasts can crowd or disrupt hematopoiesis.

Transfer: What studies establish lineage?

Explain it back: Write a causal chain for one decision, then identify which piece of evidence would change the answer.

Unscored teaching examples; not validated assessment items or patient-specific advice.

How to use this foundation map

  1. Identify the organizing mechanism.
  2. Recognize the pattern.
  3. Restate the rule without looking.
  4. Test transfer with applications and question practice.

Pair CPR with the 5P Approach™ when solving cases and questions.

Back to Chapter 11 in the Foundations Library · USMLE Step 1 resources