Secondary malignancy estimation in patients after mastectomy and adjuvant therapy
Oludare Folajimi Adeyemi , Okhuomaruyi David Osahon , Enosakhare Godwin Okungbowa
Journal of Cancer Metastasis and Treatment ›› 2018, Vol. 4 : 53
Secondary malignancy estimation in patients after mastectomy and adjuvant therapy
Aim: Secondary malignancy estimation after radiotherapy of post mastectomy patients is becoming an important subject for comparative treatment planning. The data from modern treatment planning systems provide accurate three-dimensional dose distributions for each individual patients, thereby opening up new possibilities for more precise estimates of secondary cancer incidence rates in the irradiated organs.
Methods: This study estimates the probability of secondary malignancy using radiobiological model for post mastectomy patients in a low-resource center, Nigeria. The secondary cancer complication probability (SCCP) was computed for linear, linear-exponent and linear-plateau models.
Results: The result shows that comparing the three models the mean SCCP for the contralateral breast ranged between 0.41%-0.93%; for the lung (0.34%-5.93%); while for the chest wall is between 0.65%-31.95%. Also, the result showed that based on the differential dose volume histogram, the SCCP in the chest wall is highest compared to the lung and contralateral breast; while the linear model overestimate the risk of secondary malignancy, the linear-exponent and the linear plateaus gave values not outrageously high.
Conclusion: The models in this study have shown that the risk of secondary malignancy in these post mastectomy patients is low.
Probability / radiobiological model / complication / malignancy
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