Table 2 Patient-specific parameters.

From: Quantitative mathematical modeling of clinical brain metastasis dynamics in non-small cell lung cancer

Parameter

Meaning

Unit

Patient 1

Patient 2

Determination

S d

PT size at diagnosis

mm

36.0

53.7

Data

Histology

  

Adenocarcinoma

Squamous cell carcinoma

Data

T d

Age of the PT at diagnosis

year

5.3

2.1

Predicted

Visibility threshold

 

mm

3

3

Fixed

S 0, p

Initial size of the PT

cell

1

1

Fixed

S 0

Initial size of a BM

cell

1

1

Fixed

αp

Proliferation rate at one cell (PT)

day−1

0.0284

0.0858

Computed

βp

Exponential decrease of growth rate (PT)

day−1

1.03 × 10−3

3.10 × 10−3

Computed

DT PT

PT doubling time at 3 cm

day

173

57

Predicted

α1

PT growth rate during relapse

day−1

5.72 × 10−4 (23.6)

0.0101 (5.28 × 10−3)

Fit PT

κ

PT log-kill effect

day−1

4.46 × 10−3 (20.6)

0.0439 (1803)

Fit PT

t res

Half-life of treatment response

day

149 (1.05 × 10−3)

35.4 (0.998)

Fit PT

α0

Proliferation rate at one cell (BM)

day−1

0.0284

0.0858

Computed

β

Exponential decrease of growth rate (BM)

day−1

1.03 × 10−3

3.10 × 10−3

Computed

τ

Dormancy duration

day

133 (4.23)

171 (33.3)

Fit BM

DT BM

BM doubling time at 3 cm

day

173

57

Predicted

μ

Cellular metastatic potential

cell−1 × day−1

2.00 × 10−12 (2.83)

1.02 × 10−12 (71.9)

Fit BM

γ

Fractal (Hausdorff) dimension of the vasculature (x1/3)

1

1

Fit BM*

d

Dissemination rate at 3 cm

day−1

0.0282

0.0144

Predicted

  1. Values of the parameters from either the data (Data), the model assumptions (Fixed), estimated from direct computations from diagnosis data (Computed), fit of the TGI model to the PT data (Fit PT) or fit of the metastatic dormancy model to the brain metastases data (Fit BM), or computed from these estimations (Predicted). Values in parenthesis for fitted parameters correspond to the relative standard errors expressed in percent, i.e. \(\tfrac{{se}}{{est}}\times 100\) where se is the standard error (square root of the covariance diagonal entry, see Materials an methods) and est is the parameter estimate. *For value of the parameter γ, due to identifiability issues, only five possible values were considered during the fit procedure (see Methods).