| Rank |
Pathway / Axis |
Cancer / Tumor Context |
Normal Tissue Context |
TSF |
Primary Effect |
Notes / Interpretation |
| 1 |
Topoisomerase II poisoning (DNA double-strand break stress) |
Topo II–DNA cleavage complexes ↑ → DNA breaks ↑ → apoptosis/senescence ↑ (context) |
Also affects normal proliferating tissues (marrow, mucosa) |
P, R |
Core cytotoxic mechanism |
Primary anticancer mechanism: stabilization of Topo II–DNA cleavage complexes blocks repair and drives lethal DNA damage responses. |
| 2 |
DNA intercalation → replication/transcription disruption |
DNA/RNA synthesis ↓; replication stress ↑ |
Off-target in normal dividing cells |
P, R |
Replication/transcription blockade |
Intercalation contributes to replication fork stress and complements Topo II poisoning. |
| 3 |
Redox cycling / iron-associated oxidative injury (context-dependent) |
ROS / oxidative damage ↑ (reported; model-dependent) |
Oxidative injury risk in sensitive tissues (esp. heart) ↑ |
P, R, G |
Stress amplification |
Often described as semiquinone redox cycling and iron interactions; the relative importance vs Topo II varies by tissue/model. |
| 4 |
Cardiotoxicity axis (TOP2β + mitochondrial injury; cumulative-dose dependent) |
— |
Risk of cardiomyopathy/heart failure ↑ with cumulative exposure |
R, G |
Major dose-limiting toxicity |
Clinically important boxed-warning toxicity; risk increases with cumulative dose (labels cite higher risk above ~550 mg/m²; higher-risk patients often use lower limits). |
| 5 |
Myelosuppression (bone marrow progenitors) |
— |
Neutropenia/anemia/thrombocytopenia risk ↑ |
R, G |
Dose-limiting toxicity |
Expected on-target effect in rapidly dividing marrow cells; infection risk increases when neutrophils are low. |
| 6 |
p53 / DNA-damage response programs |
DDR signaling ↑; p53 pathway engagement ↑ (context) |
DDR activation in normal tissues contributes to toxicity |
R, G |
Cell fate commitment |
Downstream of DNA breaks: checkpoint activation, apoptosis, senescence, or mitotic catastrophe depending on genotype and dose. |
| 7 |
Immunogenic cell death signals (DAMP exposure; context-dependent) |
Potential ICD features ↑ (reported in some systems) |
— |
G |
Immune engagement (conditional) |
Anthracyclines are often discussed as capable of immunogenic cell death in certain settings; not universal across regimens. |
| 8 |
Extravasation tissue injury (local) |
— |
Severe local tissue damage risk if IV leakage occurs |
P, R |
Administration hazard |
Boxed warning emphasizes severe tissue injury with extravasation; requires strict IV administration controls. |
| 9 |
Secondary malignancy risk (therapy-related AML/MDS; exposure-dependent) |
— |
Rare long-term risk signal ↑ |
— |
Late toxicity constraint |
Listed in boxed warnings/labels as a potential late effect, especially with combination regimens. |
| 10 |
Cardioprotection strategy (dexrazoxane; selected settings) |
— |
Cardiotoxicity risk ↓ (when used appropriately) |
R, G |
Risk mitigation |
Dexrazoxane is used to reduce anthracycline cardiotoxicity; mechanistic literature includes TOP2β-linked protection and other hypotheses. |