Donor-derived human bone marrow cells contribute to solid organ cancers developing after bone marrow transplantation

Area of Science:

• Oncology
• Stem Cell Biology
• Transplantation Medicine

Background:

• Bone marrow stem cells are implicated in tissue repair.
• Aberrant stem cell differentiation may drive malignancy.
• The role of bone marrow stem cells in human cancer is unclear.

Purpose of the Study:

• To investigate if bone marrow stem cells contribute to human solid organ cancers.
• To determine if malignant cells in post-transplant cancers can be of donor origin.

Main Methods:

• Analysis of four male patients who developed solid organ cancers post-allogeneic bone marrow transplantation (ABMT) from female donors.
• Identification and quantification of donor-derived cells within tumors using genetic markers.

Main Results:

• Four patients developed various solid organ cancers (lung adenocarcinoma, laryngeal squamous cell carcinoma, glioblastoma, Kaposi sarcoma) after ABMT.
• Donor-derived malignant cells were detected in 2.5%-6% of tumor cells in these patients.

Conclusions:

• The presence of donor-derived malignant cells suggests bone marrow stem cells can participate in human carcinogenesis.
• The precise role of these stem cells in cancer development requires further investigation.