Assessing the Effects of Estrogen on the Dynamics of Breast Cancer

Table 1

Model parameters and their interpretations.

Parameter	Symbol	Value	Units	Reference
Per capita growth rate of normal cells	𝛼1	0.70	(day)^−1	est
Per capita growth rate of tumor cells	𝛼2	0.98	(day)^−1	[11]
Natural death rate of normal cells	𝛽1	0.30	(day)^−1	est
Natural death rate of tumor cells	𝛽2	0.40	(day)^−1	[12]
Normal cell death rate due to competition	𝛿1	1.0	(day)^−1	[12]
Tumor death rate due to immune response	𝛾2	0.9	(day)^−1	[12]
Source rate of immune cells	𝑠	0.4	(day)^−1	[13]
Immune response rate	𝜌	0.2	(day)^−1	[13]
Immune threshold rate	𝜔	0.3	(day)^−1	[13]
Natural death rate of immune cells	𝜇	0.29	(day)^−1	[12]