'Little Couple' Update: Jen Arnold has Cancer

dr jen arnold battling rare cancer

Dr. Jen Arnold, who appears with her husband on the TLC reality show 'The Little Couple,' is battling a rare form of cancer.

The Houston-based neonatologist, 39, and her husband Bill Klein, 38, recently expanded their family with the adoption of son Will, 3, from China, and daughter Zoey, 2, from India.

Arnold provided this statement to PEOPLE, "I have recently been diagnosed with a rare type of cancer and am currently undergoing treatment, including surgery and chemotherapy."

"I am very fortunate as the prognosis is good.  While there is never a good time to get news like this, getting it just as we are building our new family is tough in many ways... But being surrounded by the love of my husband and our two beautiful children is actually in many ways giving me the strength to fight it even stronger."

Jen has had 30 procedures and surgeries related to her dwarfism, allowing her to put all of her life experiences into the proper perspective.

Her husband acknowledged, "Jen has achieved so many great things.  We are so in love with each other and supportive of each other that we are going to be OK.  Few people are so luck to have what we do.  We are up for challenges."

Season 5 ended with Bill, Jen and Will set to embark on a trip to India to pick up their daughter.

jen and bill with will

A television network spokesman said, "TLC has chronicled Bill and Jen's lives since 2009 and at their request, we will be following them through this challenge.  Jen is a doctor and teacher and she saw this as an opportunity to educate and possibly help, through sharing her story."

Photos:  Facebook-Jen Arnold, Facebook-The Little Couple