```xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<ns4:query_definition xmlns:ns2="http://www.i2b2.org/xsd/cell/crc/psm/1.1/" xmlns:ns4="http://www.i2b2.org/xsd/cell/crc/psm/querydefinition/1.1/" xmlns:ns3="http://www.i2b2.org/xsd/cell/crc/psm/analysisdefinition/1.1/">
    <query_name>Malignant neopl@10:04:44</query_name>
    <query_timing>ANY</query_timing>
    <specificity_scale>0</specificity_scale>
    <panel>
        <panel_number>1</panel_number>
        <panel_timing>ANY</panel_timing>
        <panel_accuracy_scale>100</panel_accuracy_scale>
        <invert>0</invert>
        <total_item_occurrences>1</total_item_occurrences>
        <item>
            <hlevel>4</hlevel>
            <item_name>Malignant neoplasm of breast (c50)</item_name>
            <item_key>\\ICD10_ICD9\Diagnoses\(C00-D49) Neop~k3n8\(C00-C96) Mali~yqqr\(C00-C75) Mali~lbm0\(C50-C50) Mali~q8ki\</item_key>
            <item_icon>FA</item_icon>
            <tooltip>Diagnoses \ Neoplasms (c00-d49) \ Malignant neoplasms (c00-c96) \ Malignant neoplasms, stated or presumed to be primary (of specified sites), and certain specified histologies, except neuroendocrine, and of lymphoid, hematopoietic and related tissue (c00-c75) \ Malignant neoplasm of breast (c50)</tooltip>
            <class>ENC</class>
            <item_is_synonym>false</item_is_synonym>
        </item>
    </panel>
</ns4:query_definition>

```

I want to find all patients with a diagnosis of malignant neoplasm of the breast (ICD-10 code C50) within the specified timeframe. This query is designed to identify cases of malignant breast cancer using the ICD-10 coding system, with a high level of specificity and no inversion applied. The panel is focused on neoplasms, specifically malignant neoplasms that are stated or presumed to be primary, and the class is set as ENC (Encounter).