Oncology care

Oncology nursing on the NCLEX is four jobs: catch cancer warnings early, give hazardous drugs without harming tissue or staff, protect a marrow-suppressed client through nadir, and spot metabolic emergencies like tumor lysis.

Prevention, screening, and warning signs

Teach what to report and what clients can change. Tissue diagnosis (biopsy/pathology) confirms cancer. Screening finds problems earlier; it does not replace a definitive test when cancer is suspected. Warning-sign teaching fails when the nurse shrugs off a changing mole or blood in stool as “probably nothing.”

Staging answers “how far has this gone?” The exam idea is tumor size/extent, lymph-node involvement, and distant metastasis (TNM-style thinking). Higher stage usually means more systemic therapy, more symptom burden, and tighter infection/bleeding watch once treatment starts. You are not asked to recite every stage cell — you are asked to match care intensity to burden and to support the diagnostic plan without promising outcomes you cannot know.

Chemotherapy safety and extravasation

Chemotherapy hits rapidly dividing cells: tumor, marrow, GI mucosa, hair. That is why nausea, mucositis, alopecia, and marrow suppression travel together. Vesicants destroy tissue if they leak out of the vein. Hazardous-drug handling protects the nurse and anyone cleaning body fluids for the excretion window the protocol names.

Before you hang a vesicant, confirm line patency with a blood return and a site that looks quiet. Burning, swelling, coolness, or loss of blood return mid-infusion means the drug may be in the tissue. The sequence is fixed because every extra milliliter of vesicant widens necrosis.

1. Vesicant burning/swelling/no blood return: stop the infusion immediately.
2. Do not push more drug. Leave the catheter for antidote aspiration/instillation per protocol unless ordered otherwise.
3. Notify the provider and mark/photograph the site per policy.
4. Use chemo-rated PPE for preparation, administration, and body-fluid handling.
5. Give antiemetics on the schedule that prevents vomiting — often before highly emetogenic chemo — not only after the basin fills.

Central lines reduce peripheral vesicant risk but do not erase it. Port or PICC problems (pain in the chest wall, swelling in the arm/neck, no blood return) still stop the drug and escalate. Spill kits and double-glove chemo PPE are not optional theater — skin absorption and aerosolized powder are real occupational hazards.

Radiation: external beam vs sealed implant

External beam treats a mapped field from outside the body. The client is not radioactive afterward. Skin in the field becomes fragile: wash gently with lukewarm water, pat dry, avoid unmarked lotions/powders/tape/sun unless the radiation team clears them, and report wet desquamation. Fatigue is expected; infection from broken skin is not.

• Sealed implant (brachytherapy): private room, limit time near the client, maximize distance, use shielding, restrict pregnant staff/visitors per policy.
• Do not touch a dislodged sealed source with bare hands — use tongs/forceps per policy and notify radiation safety.
• High-dose methotrexate: leucovorin is the timed rescue for normal cells as the protocol schedules it.
• Body fluids after some systemic radioisotopes follow radioactive precautions per protocol — read the order set, do not invent rules.

Nadir, neutropenia, and febrile emergency

Nadir is the lowest point of the blood counts after a chemo cycle, often about 7–14 days later depending on the regimen. That is when infection and bleeding risk peak. Teaching before discharge is timed to that window: the client must know who to call for fever and how to live with a thin white-cell and platelet safety net.

Febrile neutropenia is treated as medical emergency because the usual inflammatory signs can be muted until sepsis is already moving. A client calling with 100.8°F (38.2°C) after recent chemo needs urgent evaluation, not “rest and call back if it climbs.” Expect rapid cultures, broad antibiotics as ordered, and source hunting — delay is the distractor.

Mucositis and gut toxicity

Mucositis is chemotherapy (and some radiation) injury to the lining of the mouth and gut. Painful ulcers block intake, open a door for organisms when neutrophils are low, and drive dehydration. Nursing care is gentle and early: soft toothbrush or foam swab as ordered, bland rinses without alcohol, soft cool foods, topical pain relief as ordered, and escalate for white plaques, fever, or inability to drink.

• Avoid alcohol mouthwash, spicy/acidic foods, and flossing that shreds fragile tissue when counts are low (follow protocol).
• Report odynophagia, diarrhea with blood, or oliguria — mucositis plus marrow suppression compounds risk fast.
• Nutrition support and antiemetic adherence protect healing more than “force solids.”

Tumor lysis syndrome

When a large tumor burden dies quickly (bulky lymphomas/leukemias are classic stems), cell contents spill into blood: potassium, phosphate, and uric acid rise; calcium often falls. The first lethal threat is often hyperkalemia with arrhythmia. Prevention is hydration and uric-acid control (allopurinol or ordered alternatives) before and during high-risk therapy. Treatment is cardiac monitoring, electrolyte management, and renal support as ordered — not reassurance that “the chemo is working” while K+ climbs.

Drug-class detail for chemo agents and rescue meds also lives in Oncology hematology medications. This chapter owns the safety and marrow-suppression nursing map.

Priority map