Myelosuppression Module

Module myelosuppression 1 disorder Pathograph 4

A conserved treatment-toxicity module representing the final common pathway by which cytotoxic insults to the bone marrow produce multilineage cytopenias and their clinical sequelae. The initiating insult varies — cytotoxic chemotherapy (fluoropyrimidines, platinums, topoisomerase inhibitors, alkylators), ionizing radiation, and other antiproliferative exposures — but the downstream sequence repeatedly converges on damage to proliferating hematopoietic stem and progenitor cells, suppression of marrow output, peripheral neutropenia/anemia/ thrombocytopenia, and the dose-limiting complications (infection, fatigue, bleeding) that follow. This is a "side effect as mechanism" module: it captures the conserved adverse-drug-reaction pathophysiology shared across many culprit drugs, so individual drug-toxicity entries (e.g. a chemotherapy-induced cytopenia entry) can declare conformance rather than re-deriving the chain.

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Pathophysiology Nodes

4 shared nodes are defined in this module.

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Cell Types

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Biological Processes

Notes

This is a mechanism module, not a specific disease. Disorder entries reference individual nodes via conforms_to (e.g., "myelosuppression#Multilineage Peripheral Cytopenias"). Conforming nodes should substitute the disorder-specific cytotoxic driver (the particular antineoplastic agent or radiation exposure) and may specialize the cytopenia node to a predominant lineage (e.g. irinotecan/neutropenia-predominant, carboplatin/ thrombocytopenia-predominant) while preserving the conserved HSPC-injury → marrow-suppression → cytopenia → complication chain. The key conformance / consequence target is "myelosuppression#Multilineage Peripheral Cytopenias".

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Used By Disorder Entries

Chemotherapy-Induced Neutropenia via Cytotoxic chemotherapy exposure and hematopoietic progenitor injury → Cytotoxic Insult to Proliferating Hematopoietic Progenitors , Bone marrow granulopoietic suppression → Bone Marrow Hematopoietic Suppression , Peripheral neutropenia → Multilineage Peripheral Cytopenias , Febrile neutropenia and infection susceptibility → Cytopenia-Related Clinical Complications

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Pathograph

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Pathophysiology

Cytotoxic Insult to Proliferating Hematopoietic Progenitors

trigger

The conserved initiating lesion is cytotoxic damage to the rapidly dividing hematopoietic stem and progenitor cells (HSPCs) of the bone marrow. Because antiproliferative chemotherapy and radiation are not selective for tumor cells, the highly proliferative marrow compartment is collaterally injured, triggering progenitor apoptosis and cell-cycle arrest regardless of the specific agent involved.

hematopoietic stem cell CL:0000037 hematopoietic progenitor cell CL:0008001

apoptotic process GO:0006915 INCREASED

Used by disorders

Chemotherapy-Induced Neutropenia as Cytotoxic chemotherapy exposure and hematopoietic progenitor injury

Downstream

Bone Marrow Hematopoietic Suppression Progenitor injury and apoptosis reduce the marrow's capacity to sustain hematopoiesis.

Bone Marrow Hematopoietic Suppression

central effector

Loss of functional progenitors and acute injury to marrow cellularity and the supporting vascular niche suppress hematopoietic output. This is the central effector step: the marrow can no longer replace circulating blood cells at the normal rate, and the deficit becomes the dose-limiting toxicity of the cytotoxic regimen.

hematopoietic stem cell CL:0000037

hemopoiesis GO:0030097 DECREASED

Used by disorders

Chemotherapy-Induced Neutropenia as Bone marrow granulopoietic suppression

Downstream

Multilineage Peripheral Cytopenias Reduced marrow output lowers the numbers of mature blood cells released to the periphery across multiple lineages.

Multilineage Peripheral Cytopenias

effector

Suppressed marrow output reduces the mature blood cells reaching the circulation, producing the multilineage cytopenias that define myelosuppression: neutropenia, anemia, and thrombocytopenia (with lymphopenia in some regimens). This is the key conformance target of the module; conforming disorder nodes may specialize it to the lineage that predominates for a given agent.

neutrophil CL:0000775 erythrocyte CL:0000232 platelet CL:0000233

myeloid cell homeostasis GO:0002262 DECREASED

Used by disorders

Chemotherapy-Induced Neutropenia as Peripheral neutropenia

Downstream

Cytopenia-Related Clinical Complications Each cytopenia drives its characteristic clinical complication.