Cancer Transmission Between Identical Twins in Utero Documented
Researchers analyze rare fetal cancer spread through shared placental blood supply.
1Rare Fetal Cancer Case
Doctors in the UK documented a tragic case where cancer spread from one identical twin to another in the womb. The study, published in Nature Communications, highlights an incredibly rare medical occurrence. Both infants were delivered via caesarean section at 34 weeks gestation but unfortunately did not survive after birth.
2Detection and Initial Diagnosis
Medical professionals first identified the condition during a routine fetal imaging scan, which revealed a mass on one twin's face. Following this discovery, the decision was made to perform an early delivery. Upon birth, doctors observed noticeable tumors throughout the bodies of both infants, prompting an immediate and deep genetic investigation.
3Genetic Analysis Methodology
Researchers at the Wellcome Sanger Institute conducted a comprehensive genetic analysis with the family's permission. By sequencing the entire genome of cells taken from the newborns and their tumors, the team traced the genetic path of the cancer. This allowed them to distinguish between unique mutations and shared inherited genetic traits.
4Mechanism of Tumor Spread
The study concluded that the cancer originated in the first twin's facial mass and spread throughout their body. The disease was subsequently transmitted to the second twin via their shared blood supply in the placenta. Researchers noted that this transmission likely occurred late in gestation and was a singular, rare event.
5Unexpected Placental Findings
Genetic analysis revealed an anomaly regarding the twins' development. The placenta was almost entirely comprised of cells from the second twin, contradicting the classic model of twinning. Typically, the placenta should contain a roughly even mix of cells from both embryos, suggesting a unique developmental path for these specific twins.
6Challenging Twinning Models
The findings suggest that the first twin may have formed from a single cell early in the zygote's development before splitting into two embryos. This chain of events deviates from established biological theories regarding how embryos divide and share placental resources. Such insights provide a new perspective on early human development stages.
7Scientific Contribution and Legacy
Despite the tragic outcome, the family allowed researchers to study the case to advance medical knowledge. Sam Behjati, a researcher at the Wellcome Sanger Institute, emphasized that this gift to science provides fundamental insights into twinning. The team plans to continue studying twin genetics to determine if this phenomenon occurs more frequently.
8Future Research Implications
This case serves as a critical data point for understanding both in utero cancer transmission and the complexities of twin biology. By mapping tumor spread and genetic segregation, scientists hope to better understand the nature of identical twins. Future research will aim to clarify whether these developmental anomalies are common occurrences.
Original article: Gizmodo — Cancer Transmission Between Identical Twins in Utero Documented