How to Grade and Identify the Stage of a Tumor

What is Cancer?

Cancer is a disease of the cell in which the normal mechanisms of control of growth and proliferation are disturbed. This results in distinctive morphologic alterations of the cell and aberrations in tissue patterns.

The malignant cell is able to invade the surrounding tissue and regional lymph nodes. Primary cancer usually has a predictable natural history and pattern of spread.

Metastasis

Metastasis is the secondary growth of the primary cancer in another organ. The cancer cell migrates through a series of steps to another area of the body. This is the reason that cancer cannot always be cured by surgical removal alone. Most patients die as a result of metastases rather than progression of the primary cancer. Metastasis begins with local invasion followed by detachment of cancer cells that disseminate via the lymphatics and blood vessels and eventually establish a secondary tumor in another area of the body. Lymph nodes are often the first site of distant spread.

Staging

Staging is necessary at the time of diagnosis to determine the extent of disease (local versus metastatic), to determine prognosis, and to guide proper management.

The American Joint Committee of Cancer (AJCC) has developed a simple classification system (TNM) that can be applied to all tumor types. It is a numerical assessment of tumor size (T), presence or absence of regional lymph node involvement (N), and presence or absence of distant metastasis.

AJCC Classification System of Tumors

T – Primary Tumor

Tx – Primary tumor is unable to be assessed

T0 – No evidence or primary tumor

Tis – Carcinoma in situ

T1, T2, T3, T4 – Increasing size and/or local extent of primary tumor

N – Presence or absence or regional lymph node involvement

Nx – Regional lymph nodes are unable to be assessed

N0 – No regional lymph node involvement

N1, N2, N3 – Increasing involvement of regional lymph node

M – Absence or presence or distant metastasis

Mx – Unable to assess

M0- Absence of distant metastasis

M1 – Presence of distant metastasis

No standard evaluation exists for all cancers. Work-up depends on the patient, tumor type, symptoms, and medical knowledge of the natural history that cancer.

Staging Considerations

It is important that staging is done correctly mainly for the reason that the disease stage will determine the treatment the patient will receive. So, errors in staging might lead to the inappropriate treatment, thus, the patient’s rate of survival will likely be lessened. But correct staging is not an easy task. There are two main reasons why pathologic staging (tissue sections are examined) can become problematic: random tissue sampling and visual discretion, or the ability to recognize single cancerous cells when surrounded or intermixed with ones that are healthy on a slide. With random sampling, cherry-picked sections of the lymph nodes could mean that the slices happen to be healthy cells or that it might not have included the cancerous cells.

Not to fret, as fresh and highly-sensitive staging methods are being developed.

Image courtesy of sjhannam.edublogs.org and prostatecancercentre.com

Daisy Jane Antipuesto RN MN

Currently a Nursing Local Board Examination Reviewer. Subjects handled are Pediatric, Obstetric and Psychiatric Nursing. Previous work experiences include: Clinical instructor/lecturer, clinical coordinator (Level II), caregiver instructor/lecturer, NC2 examination reviewer and staff/clinic nurse. Areas of specialization: Emergency room, Orthopedic Ward and Delivery Room. Also an IELTS passer.

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