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Feb 10, 2018 06:06AM
Feb 10, 2018 06:29AM
In my layperson's understanding (which could be wrong), unless you were told you have Mixed invasive histology, from the information you provided above, you do not appear to have "Mixed" type breast cancer.
The term "Mixed" ordinarily refers to a type of invasive breast cancer that is of "Mixed" INVASIVE histology.
In contrast, you have an invasive cancer and a non-invasive cancer:
- (a) Invasive Lobular Carcinoma ("ILC", INVASIVE)
- (b) Ductal Carcinoma in Situ ("DCIS", NON-INVASIVE).
So, your invasive hisology is not "mixed" but appears to be "lobular".
You also have some non-invasive disease (DCIS) present.
Background Information re Grading Systems:
Please note that different grading systems are used to grade invasive breast cancers and to grade DCIS.
(a) Grading Systems for INVASIVE Breast Cancer: There are a variety of methods in use to assign grade for invasive breast cancers. Overall grade can be: Low (grade 1); Intermediate (grade 2); or High (grade 3).
One commonly used system is the Nottingham Histologic Score (Elston grade), which considers three main histologic features of invasive cancer, independently assigns a sub-score for each feature, and then combines the three sub-scores to assign an "Overall Grade". Here is a description of that system from Johns Hopkins:
Nottingham Histologic Score (Elston grade): http://pathology.jhu.edu/breast/grade.php
(b) Grading Systems for NON-INVASIVE DCIS: There are a variety of methods in use to assign grade for DCIS, which is a "non-invasive" condition, meaning the tumor cells are confined inside the duct. Grade can be: Low (grade 1); Intermediate (grade 2); or High (grade 3).
Per a 2013 review article by Bane: "There are three commonly referenced grading schemes for DCIS, all of which employ the assessment of nuclear grade and presence/type of necrosis with some additionally utilising cellular polarity to ascribe an overall grade [9-11]. No one system has been endorsed; however, a consensus conference and the College of American Pathologists recommend that a pathology report should include a description of nuclear grade, presence and type of necrosis, and the architectural patterns present [8,12]."
"Architectural pattern" refers to the terminology used to describe the appearance of cells within the ducts or how full they are with DCIS (e.g., solid, cribiform, papillary).
For a summary of one example of a DCIS grading system, see this Stanford outline here.
===> You can (and should) obtain copies of the complete pathology reports from all surgeries and biopsies for your review and records. The reports may refer to the name(s) of the grading system(s) or provide additional detail.
Re the DCIS: "I can't tell if the DCIS is graded as the report says overall Grade 1 and DCIS high grade-no number."
The overall Grade 1 appears to the refer to the grade of the ILC. Please confirm it with your team.
Per your description, the DCIS is "high grade", which is the highest of three possible grades (Low (grade 1); Intermediate (grade 2); or High (grade 3)). Please confirm it with your team.
Regardless of grade, DCIS is a "non-invasive" condition (confined to the inside of the ducts).
=====> Please check your pathology report for information regarding the extent of the DCIS, its ER and PR status, and the size of the surgical margins relative to the DCIS, which should all be separatley reported from the features of the ILC.
Re the ILC: "[O]verall Grade 1 . . . Combined Histologic Score 3 + 1 + 1. Histologic Grade for Lobular: Glandular Differentiation Score 3."
The ILC has an "Overall Grade" of 1 or overall "Low grade." Again, please confirm it with your team.
The overall grade appears to be based on a combined histologic score of "3 + 1 + 1".
The sub-score "3" appears to refer to the "Glandular Differentiation Score" of "3", presumably in light of a low extent of glandular/tubular structures in the ILC.
The other sub-scores (1 + 1) likely refer to the nuclear and mitotic features of the ILC.
The three sub-scores (3 + 1 + 1) were added up to yield a total score of 5, which led to assignment of an "Overall Grade" of 1.
Re the reference to: "Pathologic Stage: pT1b and pN0"
Anatomic staging under the TNM system considers three elements: Tumor size ("T"); Lymph Node status ("N"); and evidence of distant metastasis ("M").
p = "pathologic" (i.e., based on surgical pathology)
pT1b = refers to the size of the largest invasive tumor on surgical pathology: "Tumor > 5 mm but ≤ 10 mm in greatest dimension"
pN0 = "No regional lymph node metastasis identified or ITCs only"
(Note: "ITCs" (isolated tumor cells) if present should be specifically noted.)
If there is no evidence of distant metastasis ("M0"), then pT1b N0 M0 would be in Anatomic Stage IA. Please confirm it with your team.
Although the grade of the DCIS is "high" and the grade of the ILC is Grade 1 (out of 3), the ILC is the more severe condition, because it is an invasive breast cancer and as such, presents a risk of distant metastatic recurrence.
Radiation is a local treatment.
Decisions about radiation entail a personalized risk/benefit analysis, including an estimate of the patient's estimated risk of local recurrence in light of all relevant factors, such as the type(s) of disease present, size(s) or extent of disease; margin sizes; grade; patient age, and medical history, including certain co-morbidities. The potential benefit of radiation is proportional to your risk of local recurrence, and the potential benefit should be weighed against the potential risks of treatment in your case. Your Radiation Oncologist should provide this type of information.
With invasive breast cancer, chemotherapy (if it were recommended) typically precedes radiation therapy. So please arrange to meet with Medical Oncologist in parallel to obtain expert advice regarding recommended systemic drug treatments, such as chemotherapy and/or endocrine therapy (for hormone receptor-positive disease (ER + and/or PR+)). A person with node-negative ILC that is 8 mm in size, ER+, PR+, and HER2-negative is reasonably likely to receive a recommendation for endocrine therapy alone.
Stage IA IDC, 9/2013 BMX. Right: IDC (1.5 mm, grade 2) with DCIS (5+ cm), 0/4 nodes, pN0. Left: DCIS (5+ cm), 0/1 node, pN0(i+).