Invasive Ductal Carcinoma: Symptoms, Diagnosis and Treatment

Written by Medicover Team and Medically Reviewed by Dr Neelesh Kanderi , Oncologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Invasive Ductal Carcinoma (IDC) is the most common type of breast cancer, accounting for approximately 80% of all breast cancer diagnoses. Despite its prevalence, understanding IDC's complexities can be challenging due to the varying grades, stages, and treatment options available.

Invasive Ductal Carcinoma begins in the milk ducts of the breast and invades surrounding tissue. Unlike non-invasive breast cancers, IDC has the potential to spread (metastasize) to other parts of the body, making early detection and treatment crucial.

What Are the Types of Invasive Ductal Carcinoma?

There are several types of IDC, each with unique characteristics:

Tubular Carcinoma: Generally small, slow-growing, and has a good prognosis.
Medullary Carcinoma: Often presents as a well-defined mass and may have a better prognosis than other IDC types.
Mucinous Carcinoma: Characterized by mucus production within the tumour, typically has a favourable outlook.
Papillary Carcinoma: Rare and tends to occur in older women, usually has a good prognosis.
Cribriform Carcinoma: Shows a distinctive pattern under the microscope and generally has a favourable prognosis.

What Are the Symptoms of Invasive Ductal Carcinoma?

The symptoms of Invasive Ductal Carcinoma (IDC) can vary depending on the size and stage of the tumour. In its early stages, IDC may not cause noticeable symptoms, making regular breast screening important. As the cancer progresses, common symptoms include:

A painless lump or thickening in the breast
Changes in the size or shape of the breast
Swelling in part or all of the breast
Skin dimpling or a puckered appearance (peau d'orange)
Nipple inversion or changes in the nipple
Bloody or unusual nipple discharge
Persistent breast or nipple pain
Redness or scaling of the breast or nipple skin
Swollen lymph nodes under the arm or near the collarbone

What Causes Invasive Ductal Carcinoma?

Invasive Ductal Carcinoma develops when cells lining the milk ducts of the breast undergo genetic mutations and begin to grow uncontrollably. These abnormal cells invade the surrounding breast tissue and may spread to nearby lymph nodes or other parts of the body if left untreated. While the exact cause is not always known, the condition results from a combination of genetic, hormonal, and environmental factors that trigger uncontrolled cell growth.

When Should You See a Doctor for Invasive Ductal Carcinoma?

Consult a Breast Surgical Oncologist, Medical Oncologist, or General Surgeon if you notice any unusual changes in your breasts or if symptoms persist. Early diagnosis and timely treatment can significantly improve outcomes and reduce the risk of cancer spreading.

A new lump or thickening in the breast or underarm
Changes in the size, shape, or appearance of the breast
Nipple inversion or persistent nipple pain
Bloody or unusual nipple discharge
Skin dimpling, redness, or thickening of the breast
Swelling in part or all of the breast
Swollen lymph nodes under the arm or near the collarbone

Early detection through prompt medical evaluation and appropriate treatment offers the best chance for successful recovery and long-term survival.

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How Is Invasive Ductal Carcinoma Diagnosed?

Diagnosing IDC involves a combination of imaging tests and biopsies. Common diagnostic procedures include:

Mammography: An X-ray of the breast is used as a primary screening tool.
Ultrasound: Often used to further evaluate abnormalities found in mammograms.
MRI: Provides detailed images and is particularly useful in dense breast tissue.
Biopsy: Involves extracting tissue samples for histological examination to confirm the presence of cancer cells.

Differential Diagnosis

Differential diagnosis is essential to distinguish IDC from other breast conditions. Conditions that may mimic IDC include:

Fibroadenomas: Benign breast tumours.
Ductal Carcinoma In Situ (DCIS): A non-invasive form of cancer confined to the ducts.
Lobular Carcinoma: Begins in the milk-producing lobules and can be invasive or non-invasive.
Benign Breast Disease: Such as cysts or infections that can present with similar symptoms.

What Are the Treatment Options for Invasive Ductal Carcinoma?

Treatment for IDC depends on the cancer's grade and stage, as well as the patient's overall health.

Invasive Ductal Carcinoma Grade 1 Treatment

For Grade 1 IDC, treatment often involves:

Surgery: Lumpectomy (removal of the tumour) or mastectomy (removal of the breast).
Radiation Therapy: Often follows surgery to destroy any remaining cancer cells.
Hormone Therapy: If the cancer is hormone receptor-positive.

Invasive Ductal Carcinoma Grade 2 Treatment

Grade 2 IDC may require a more aggressive approach:

Surgery: Lumpectomy or mastectomy, depending on the tumour size and location.
Radiation Therapy: Post-surgery to minimize recurrence.
Chemotherapy: May be recommended based on the tumor's characteristics.
Hormone Therapy: For hormone receptor-positive cancers.
Targeted Therapy: For HER2-positive cancers, drugs like trastuzumab may be used.

Invasive Ductal Carcinoma Grade 3 Treatment

Grade 3 IDC requires aggressive treatment due to its rapid growth:

Surgery: Mastectomy is often preferred, but lumpectomy may be an option.
Radiation Therapy: To target remaining cancer cells post-surgery.
Chemotherapy: Almost always recommended to reduce the risk of recurrence.
Hormone Therapy and Targeted Therapy: Depending on receptor status.

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What Are the Grades and Stages of Invasive Ductal Carcinoma?

Grading and staging are critical in determining the treatment plan and prognosis.

Grading

IDC is graded based on how much the cancer cells resemble normal breast cells:

Grade 1: Well-differentiated, cells look similar to normal cells, and the cancer grows slowly.
Grade 2: Moderately differentiated cells have features between grades 1 and 3.
Grade 3: Poorly differentiated, cells look very different from normal cells, and the cancer grows more aggressively.

Staging

Staging considers the tumour size, lymph node involvement, and metastasis:

Stage 1: The tumor is small and confined to the breast.
Stage 2: The tumor may be larger and/or spread to nearby lymph nodes.
Stage 3: Tumor is large and/or extensively spread to lymph nodes but not to distant organs.
Stage 4: Cancer has spread to distant organs (metastatic cancer).

What Is the Survival Rate for Invasive Ductal Carcinoma?

Invasive Ductal Carcinoma Grade 3 Survival Rate

The survival rate for IDC varies based on grade and stage. For Grade 3 IDC, the 5-year survival rate is approximately 72%, but this can vary widely based on factors such as tumour size, lymph node involvement, and the patient's response to treatment.