Difference between revisions of "Breast cancer grading"

#*0-5 mitosis/10 [[HPF]] (1.52 mm^2 --or-- 0.0152 mm^2 * 10) = 1.

#*6-10 mitosis/10 HPF (1.52 mm^2) = 2.

#*>11 mitosis/10 HPF (1.52 mm^2) = 3.

*Elston & Ellis devised the system that is used.<ref name=pmid12405945>{{cite journal |author=Elston CW, Ellis IO |title=Pathological prognostic factors in breast cancer. I. The value of histological grade in breast cancer: experience from a large study with long-term follow-up. C. W. Elston & I. O. Ellis. Histopathology 1991; 19; 403-410 |journal=Histopathology |volume=41 |issue=3A |pages=151–2, discussion 152–3 |year=2002 |month=September |pmid=12405945 |doi= |url=}}</ref> They also wrote a follow-up article in 2002.<ref name=pmid1757079>{{cite journal |author=Elston CW, Ellis IO |title=Pathological prognostic factors in breast cancer. I. The value of histological grade in breast cancer: experience from a large study with long-term follow-up |journal=Histopathology |volume=19 |issue=5 |pages=403–10 |year=1991 |month=November |pmid=1757079 |doi= |url=}}</ref>

==Note about mitosis counting==

*One MUST adjust for the size of the field of view.

*Most of the Resident scopes have an eye piece diameter of 22 mm. Therefore, the field diameter at 40 X is approximately 22 mm / 40 X ~= 0.55 mm and the field of view is pi/4*(0.55 mm)^2 = 0.2376 mm^2.

**Thus, on a resident scope (with a FOV of 0.2376 mm^2) one should sample 6 or 7 fields of view (FsOV).

***Calculation: 1.52 mm^2 (sampling area) / 0.2376 mm^2 (area / FOV ) = 6.40 FsOV.

*'''RANT''': Sampling 10 fields, where the field of view (FOV) is 0.152 mm^2, is ''not'' the same as sampling ten fields, where the FOV is 0.312 mm^2.  It surprises me that Elston & Ellis ignore the fact that "10 HPFs" on different microscopes represent different sample areas and that they do ''not'' standardize the sampling area.

*I've found most tumours are grade II.   

*The mitotic score is usually 1/3.